24277 + Interview Questions in Biology in Class 12 Page 420 InterviewSolution

20951.	Question : Assertion : The sugar phosphatebackone of two chains in DNA double helix show anti-parallel polarity. Reason : The phosphodiester bondsin one strand go from a 3' cardon of one nucleotide to a 5, carbon of adjacent nucleotide, whereas those in complementary strand go vice versa.
Answer» If both ASSERTION and reason are true and reason is the correct explanation of assertion If both assertion and reason are true butreason is notthe correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false. Solution :The back BONE of a DNA chain or strand is built up of alternate deoxyribose sugar and phosphate groups The phosphate group is CONNECTED to carbon 5' of the sugar residue of its own nucleoide and carbon 3' of the sugar residue of the next nucleotide by (3' `to` 5') phosphiodister bonds.The two DNA chains are antiparallel , that is , they run PRALLEL but in opposite DIRECTIONS In one chain the direction . In one chain the direction is 5' `to` 3' , while in opposite one , it is 3' `to` 5'

Discussion

20952.	Question : Assertion: The spread of AIDS can be prevented by lifelong monogamy and use of disposable syringe.Reason: AIDS spreads through heterosexuality and contaminated syringe.
Answer» If both Assertion and REASON are true and the Reason is the CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is FALSE. If both Assertion and Reason are false. ANSWER :A

Discussion

20953.	Question :Assertion: The short-legged sheep is a pure breed.Reason: They appeared by mutation in one generation.
Answer» If both ASSERTION and REASON are TRUE and the Reason is the CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :A

Discussion

20954.	Question : Assertion: The sex of the baby is determined by the father and not by the mother. 50 per cent of sperms carry X chromosome and other 50 per cent carry the Y.
Answer» If both assertion and reason are true and the reason is the correct explanation of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is FALSE. If both assertion and reason are false. Solution :(A) 50 PER cent of sperms carry the X chromosome while the other 50 PERCENT carry the Y. After fusion of the male and female gametes, the zygote would carry either XX or YY depending on whether the sperm carrying X or Y fertilised the ovum. Sex of the baby is DETERMINED by the FATHER and not by the mother.

Discussion

20955.	Question : Assertion: The shape of the uterus is like an inverted pear. Reason: The inner glandular layer that lines the uterine cavity is called as myometrium.
Answer» Solution :The shape of the uterus is LIKE an INVERTED pear. The wall of the uterus has THREE LAYERS, external thin membranous perimetrium, middle thick LAYER of smooth myometrium and inner glandular layer of endometrium.

Discussion

20956.	Question : Assertion : The RNAi can be introduced in an organism by insertion of gene encoding complementary RNA only Reason : There are no methods by which in vitro synthesised complementary RNA can be inserted in an organism to induce RNAi (RNA interference)
Answer» If both assertion and reason are true and reason is the correct explanation of assertion If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is false If both assertion and reason are false Solution :RNAi (RNA interference) takes place in all enkaryotic organisms as a method of cellular DEFENSE. This method involves silencing of a specific mRNA DUE to a COMPLEMENTARY dsRNA molecule that binds to and prevents translation of the mRNA. There are two methods to induce RNA interference in any organism. The complementary RNA can be synthesisted in vitro and then annealed to PRODUCE dsRNA and insterted into cells or the cells are genetically modified to produce the two complementary RNA stands or duplex from in vivo by transcription. However, the first method i.e, INSERTION of vitro synthesised complementary RNA inhibits target gene expression for only 4-6 days and their re-introduction is required. But the second method i.e, the DNA vector construct once transfected into the cells will keep on generating RNA interference and thereby,cause a permanent inhibition of the damage.

Discussion

20957.	Question : Assertion: The regions outside the seminiferous tubules are called interstitial spaces, which contain Leydig's cells. Reason: Leydig's cells synthesise and secrete testicular hormones called androgens.
Answer» Solution :Each SEMINIFEROUS tubule is lined on its inside by TWO types of CELLS called male germ cells (spermatogonia) and sertoli cells. The regions outside the seminiferous tubules called interstitial spaces, CONTAIN Leydig's cells. Leydig's cells synthesise and secrete TESTICULAR hormones called androgens.

Discussion

20958.	Question : Assertion : The rate at which a population can be expected to grow in the future canbe assessed graphically by means ofa population pyrmid. Reason : A triangular population pyramid is characteristics of a country whose population is stable, neither growing nor shrinking.
Answer» Solution :The rate at which a population can be expected to grow in the future can be assessed graphically by means of a population pyramid-a bar graph displaying the number of PEOPLE in each age category. Males are conventionally shown to the left of the verticalage axis and FEMALES to the right. A human population pyramid thus displays the age composition of a population by sex. In general, rectangular pyramids are characteristic of countries whose populations are STABLE, their numbers neither growing nor shrinking. A traingular pyramid is characteristic of a countrty that will exhibit rapid future growth, as most of its population has not YET entered the child-bearing years. Inverted traingles are characteristic of populations that are shrinking.

Discussion

20959.	Question : Assertion: The problem of predator unlike animals.
Answer» If both ASSERTION and reason are true and the reason is the correct explanation of the assertion. If both assertion and reason are true but reason is not the correct explanation of the assertion. If assertion is true but reason is FALSE. If both assertion and reason are false. Solution :The problem of predation is particularly severe for the PLANTS as they cannot run away from their predator unlike ANIMALS.

Discussion

20960.	Question : Assertion :- The process of splicing represents the dominance of RNA world. Reason:- In the process of splicing exons are removed and introns are joined in a defined order.
Answer» If both Assertion & Reason are True & the Reason is a CORRECT EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is FALSE. If both Assertion & Reason are False. Answer :C

Discussion

20961.	Question : Assertion : The predominantsite for control ofgene expression in prokaryotes is transcription initiation. Reason : The activity of RNA polymerase is regulated by accessory proteins, which affect recognition of start sites.
Answer» If both ASSERTION and reason are true and reason is the correct explanation of assertion If both assertion and reason are true butreason is notthe correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false. Solution :(a)In prokaryotes, control of the rate of TRANSCRIPTIONAL initiation is the predominant sitefor control of gene EXPRESSION. In a transcription unit, the activityof RNA POLYMERASE at a given promoter , isin turn turn regulatedby interactionwith accessory porteins, Which affect its ability its ability to recognise start SITES. These regulatory proteins can act both positively (activators) and negatively (repressors).

Discussion

20962.	Question : Assertion: The ovule is antegeruc in Santalum. Reason : Ovule without integument is called anlegenic.
Answer» If both ASSERTION and Reason are true and Reason is CORRET explanation of Assertion If both Assertion and Reason are true and Reason is not corret explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Answer :B

Discussion

20963.	Question :Assertion: The person heterozygous for sickle-cell trait produces both normal (Hb^A)and abnormal haemoglobin (Hb^S).Reason: The normal allele and the sickle-allele are codominant.
Answer» If both ASSERTION and REASON are TRUE and the Reason is the CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :A

Discussion

20964.	Question : Assertion : The number of pioneers is little . Due to production of disseminules , the pioneers increases in number . When community is best suited for a community, it stabilizes.
Answer» If both ASSERTION and REASON are TRUE and Reason is CORRECT explanation of Assertion. If both Assertion and Reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

20965.	Question : Assertion: The middle piece is called as power house of the sperm. Reason: The numerous mitochondria coiling around axial filament produce energy for the movement of the tail.
Answer» Solution :The middle PIECE of HUMAN sperm contains the mitochondria cloiled. Around the AXIAL FILAMENT called mitochondrial spiral. They provide energy for the MOVEMENT of the sperm So it is called as the power house of the sperm.

Discussion

20966.	Question : Assertion The number of folllicles in the etaerio is many in calotropis Reason The growth of ginger rhizome is not affected by graity
Answer» Both Assertion and REASON are TURE and Reason is correct explanation of Assertion Both Assertion and Reason are true but Reason is ot a correct explanttion of Assertion Assertion is ture but Reason is flase Reason is ture but Assertion is false Solution :Calotopis is NA aggreaget fruit in such fruit a multicarpellary ovary becoms fruit and each ovary turns into fruit colatropis is an etaerio or buch of FOLLICLES

Discussion

20967.	Question : Assertion : The mechanism of DNA replication is semi-conservative in nature. Reason : Each of the complementary strands of the parental doublehelix is conservedduring the process.
Answer» If both ASSERTION and reason are TRUE and reason is the CORRECT EXPLANATION of assertion If both assertion and reason are true butreason is notthe correct explanation of assertion If assertion is true but reason is false if both assertion and reason are false. Answer :a

Discussion

20968.	Question : Assertion: The mechanism of origin and evolution can be suggested. Reason: Evidences of origin and evolution of life are available.
Answer» (a) If both Assertion and REASON are TRUE and the Reason is the correct explanation of the Assertion (b)If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. (C) If Assertion is true but the Reason is false. (d) If both Assertion and Reason are false. Answer :A

Discussion

20969.	Question : Assertion: The marshes in the innovative approach also constitute a sanctuary. Reason: The marshes have a high level of biodiversity in the form of fishes, animals and birds.
Answer» If both assertion and REASON are true and the reason is the correct EXPLANATION of the assertion If both assertion and reason are true but reason is not the correct explanation of the assertion If assertion is true but reason is FALSE If both assertion and reason are false. Solution : The marshes in the innovative approach also constitute a SANCTUARY as the marshes have a high level of biodiversity in the form of FISHES, animals and birds.

Discussion

20970.	Question : Assertion: The linked genes tend to get inherited together.Reason: The band between them fails to break.
Answer» If both ASSERTION and REASON are TRUE and the Reason is the CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :A

Discussion

20971.	Question : Assertion The imbalance in concentration of sodium and potassium ions and proteins generates the resting potential Reason To maintain unequal distribution of sodium and potassium, neurons use electrical energy
Answer» Both ASSERTION and Reason are TRUE and Reason is the CORRECT explanation of Assertion Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion Assertion is true, but Reason is false Both Assertion and Reason are false Answer :C

Discussion

20972.	Question : Assertion : The higher concentration of O_2in the atmoshere is inhibitory to photosynthesis.
Answer» If both ASSERTION and reason are TRUE and reason is the correct explanationof assertion If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is false If both assertion and reson are false. Solution :Oxygen accumulation causes substantial inhibition of photosynthesis. Both oxygen causes a direct and INDEED competitive ,inhibition of Ribulose disphate corboxylase. As a result GLYCOLATE syntheses is enhaced and leads to begin photrespiration. Carbon dioxide being one of the raw materials for photosyntesis, its concentration affects the rate of photosyntesis markedly.Because of its very low concertration affects the rate of PHOTSYNTHESIS markedly. Because of tis very low concentaration in atmosphere (0.03 per cent only.) it acts as a limiting factor in natrual photosynthesis .

Discussion

20973.	Question : Assertion:Holoblastic cleavage with almost equal sized blastomeres is a characteristic of placental animals. Reason: Eggs of most mammals, including humans, are of centrolecithal type.
Answer» If both ASSERTION and REASON are TRUE and the Reason is the CORRECT EXPLANATION of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :D

Discussion

20974.	Question : Assertion: The heliophytes possess high chlorophyll contents and low concentration of saIt and sugar. Reason: Due to this, plants are able to grow in shade also.
Answer» (a) If both Assertion and Reason are true and the Reason is the CORRECT explanation of the Assertion. (B) If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. (c) If Assertion is true but the Reason is FALSE (d) If both Assertion and Reason are false. Solution :If Assertion is true but the Reason is false

Discussion

20975.	Question : Assertion :- The geologcial histroy of earth closely correlates with the biological history of earth. Reason :- Earth is very old.
Answer» If both ASSERTION & REASON are TRUE & the Reason is a CORRECT explanation of the Assertion. If both Assertion & Reason are True but Reason is a not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are false. Answer :B

Discussion

20976.	Question : Assertion: The gap between the canines and premolar is called diastema. Reason: It helps in mastication and chewing of food in herbivorous animals.
Answer» Both ASSERTION and REASON are TRUE and Reason is CORRECT explanation of Assertion. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. Assertion is true but Reason is FALSE. Both Assertion and Reason are false. Solution :Both Assertion and Reason are true and Reason is correct explanation of Assertion.

Discussion

20977.	Question : Assertion : The fitness according to Darwin, refers ultimately and only to reproductive fitness. Reason : Those who are better fit in an environment leave more progeny than other.
Answer» If both Assertion & Reason are TRUE & the Reason is a CORRECT EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is FALSE. If both Assertion & Reason are False. Answer :A

Discussion

20978.	Question : Assertion: The first part of dicot embryo to appear above ground is the leaf. Reason: Leaves increase the size of plant.
Answer» If both ASSERTION and REASON are TRUE and Reason is CORRET explanation of Assertion If both Assertion and Reason are true and Reason is not corret explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Answer :D

Discussion

20979.	Question : Assertion. The first codon discovered by Nirenberg and Mathaei was UUU. Reason. Genetic code translates the language of protein into that of RNA.
Answer» If both Assertion and REASON are true and the Reason is a correct EXPLANATION of the Assertion . If both Assertion and Reason are true but Reason is not a correct EXPLANATIONS of the Assertion If Assertion is true but the Reason is false . If both Assertion and Reason are false. Answer :D

Discussion

20980.	Question : Assertion : The first clinical gene for ADA therapy was given to cure SCID Reason : The normal gene was delivered into the patient's cell using retroviral vector
Answer» If both ASSERTION and REASON are true and reason is the CORRECT EXPLANATION of assertion If both assertion and reason are true but reason is not the correct explanation of assertion If assertion is true but reason is false If both assertion and reason are false Answer :B

Discussion

20981.	Question : Assertion: The female external genitalia includes mons pubis, labia majora and labia minora. Reason: The glandular tissue of each breast is divided into 5-10 mammary lobes.
Answer» SOLUTION :The female external genitalla include monspubis labla majora, labia minora, hymen and citoris. The MAMMARY GLANDS are paired structures (breasts) that contain glandular tissue and variable amount of fat. The glandular tissue of each breast is divided into 15-20 mammary lobes containing CLUSTERS of cells called alveoli.

Discussion

20982.	Question : Assertion : The epiphytes use the trees only for attachment and manufacture their own food by photosynthesis. Reason : Commensalism results in negative effects on the growth and survival of one or both of the populations.
Answer» SOLUTION :Epiphytes which grow on the branches and in the forks of some TREES, cite an example of commensalism. Commensalism is a type of positive interaction in which, two organisms (of different species) live together without any physiological dependence between them, and ONE gets the benefit from the association while the other is neither benefitted nor HARMED.

Discussion

20983.	Question : Assertion :The enzyme helicase ,bind to the origin of replication site. Reason :Helicase separates the two strands of the DNA.
Answer» SOLUTION :Both ASSERTION and REASON are TRUE but Reason is not the CORRECT explanatuion of Assertion.

Discussion

20984.	Question : Assertion :- The element is said to be deficient when present below the critical concentration. Reason:- The concentration of essential element below which plant growth is retarded is termed as critical concentration.
Answer» If both ASSERTION and REASON are TRUE and reason is the CORRECT EXPLANATION of assertion. If both assertion and reason are true but reason is not the correct explanation of assertion. If assertion is true but reason is false. If both assertion and reason are false. Answer :A

Discussion

20985.	Question : Assertion: The environmental resistance does not allow population growth to soar towards infinity. Reason: The environmental resistance checks the biotic potential.
Answer» If both ASSERTION and Reason are true and the Reason is the CORRECT explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false If both Assertion and Reason are false. Solution :If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

Discussion

20986.	Question : Assertion: The embryos of fish, salamander, tortoise, chick and a man, of same age resemble one another closely. Reason: Ontogeny recapitulates phylogeny.
Answer» SOLUTION :The early embryos in all the vertebrates exibit REMARKABLE similarity and it is not easy to DIFFERENTIATE a human embryo from the embryo of chick, lizard, from or fish in early stages. This can be explained by 'biogenetic law ontogeny is the ife HISTORY of the individual starting from individual which must have incurred in the evolution of the group of this individual. it means that in individual during its DEVELOPMENT briefs its ancestral history.

Discussion

20987.	Question : Assertion: The endometrium undergoes cyclical changes during menstrual cycle. Reason: The myometrium exhibits strong contractions during delivery of the baby.
Answer» SOLUTION :N//A

Discussion

20988.	Question : Assertion: The earth originally had a reducing atmosphere. Reason : There was no life on the earth when it came into existance
Answer» If both ASSERTION and REASON are true and Reason is the correct EXPLANATION of Assertion If both Assertion and Reason are true and Reason is not the correct explanation of Assertion If Assertion is true but Reason is false. If both Assertion and Reason are false Answer :B

Discussion

20989.	Question :Assertion: The earliest organisms that appeared on the earth were non-green and presumably anaerobes. Reason: The first autotrophic organisms were the chemoautotrophs that never released oxygen.
Answer» If both ASSERTION and Reason are true and the Reason is the CORRECT EXPLANATION of the Assertion If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is FALSE. If both Assertion and Reason are false. Answer :B

Discussion

20990.	Question : Assertion :- The DNA strand which does not code for anything is referred to as coding strand. Reason :- Coding strand sequence are same as RNA and this strand contain uracil at the place of thymine.
Answer» If both ASSERTION & Reason are TRUE & the Reason is a CORRECT explanation of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are False. Answer :C

Discussion

20991.	Question : Assertion. The DNA contents are usually constant in a given species. Reason. DNA replication is of continuous type.
Answer» If both ASSERTION and Reason are TRUE and the Reason is a CORRECT explanation of the Assertion . If both Assertion and Reason are true but Reason is not a correct explanations of the Assertion If Assertion is true but the Reason is FALSE . If both Assertion and Reason are false. Answer :C

Discussion

20992.	Question : Assertion: The development in cockroach is heterometabolous metamorphosis.Reason: Young ones resemble the adults in all characters.
Answer» If both ASSERTION and Reason are true and Reason is correct EXPLANATION of Assertion. If both Assertion and Reason are true but Reason is not correct explanation of Assertion If Assertion is true but Reason is false If both Assertion and Reason are false Answer :D

Discussion

20993.	Question : Assertion: The cut pieces of DNA are linked with plasmJd DNA Reason: Plasmid DNA fails to act as vectors.
Answer» If both ASSERTION and REASON are true and the Reason is the correct explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is FALSE. If both Assertion and Reason are false. Answer :C

Discussion

20994.	Question : Assertion: The chimpanzee is the closest relative of the present day humans Reason: The banding pattern in some autosomes of man and chimpanzee is remarkable similar.
Answer» SOLUTION :N//A

Discussion

20995.	Question : Assertion : The atmospheric concentration of CO_(2) at which photosynthesis just compensates for respiration is referred to as CO_(2) compensation point. Reason : The CO_(2) compensation point is reached when the amount of CO_(2) uptake is less than that generated through respiration because the level of CO_(2) in the atmosphere is more than that equired for achieving CO_(2) compensation point.
Answer» If both Assertion & Reason are true and the reason is the correct EXPLANATION of the assertion, then mark a lf both Assertion & Reason are true but the reason is no t the correct explanation of the assertion, then mark b If Assertion is true statement but Reason is false, then mark c If both Assertion and Reason are false STATEMENTS, then mark d. SOLUTION :At very low `CO_(2)` concentration photoynthesis is strongly limited by the low `CO_(2)` while respiratory rates are unaffccted. As a result there is NEGATIVE balance between `CO_(2)` fixed by photosynthesis and `CO_(2)` produced by respiration and a net efflux of `CO_(2)` from the plant By increasing the ATMOSPHERIC concentration of `CO_(2)` at which photosynthesis just compensate for respiration is referred to as `CO_(2)` compensation point.

Discussion

20996.	Question : Assertion : The chewing and lappingmouth parts consist of a longtounge which is formed from the glossae of the labium . Reason : Thegaleae are much elongated ane coiled, each forming a half tube , which makes complete tube when both are locked together .
Answer» If both the assertion and reason are true statement andreason is CORRECT explanation of the assertion . If both the assertion and reason are true statement but reason is not a correct explanation of the assertion . If the assertion is true but the reason is a false statement. If both assertion and reason are false STATEMENTS. SOLUTION :In CHEWING lappingmouth partsa temporary foodchannel is formed by proboscis, galeae and labial PALPS fillingtogether .

Discussion

20997.	Question : Assertion: The cells divide without any increase in size up to morula stage. Reason: Zona pellucida remains intact till cleavage is complete.
Answer» If both ASSERTION and REASON are TRUE and the Reason is the correct explanation of the Assertion. If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion. If Assertion is true but the Reason is false. If both Assertion and Reason are false. Answer :B

Discussion

20998.	Question : Assertion :- The backbone of polynucleotide chain is formed due to sugar and phosphate. Reason :- A nitrogenous base is linked to the pantose sugar through a N-glycosidic linkage to formed a nucleoside.
Answer» If both ASSERTION & REASON are TRUE & the Reason is a CORRECT EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion. If Assertion is True but the Reason is False. If both Assertion & Reason are False. Answer :B

Discussion

20999.	Question : Assertion :- The aquatic mammals like Dolphins whales etc. do not contain gill slits. Reason : Their adaptation to aquatic life secondary.
Answer» If both Assertion & Reason are True & the Reason is a correct EXPLANATION of the Assertion. If both Assertion & Reason are True but Reason is a not a correct explanation of the Assertion. If Assertion is True but the Reason is FALSE. If both Assertion & Reason are false. Answer :A

Discussion

21000.	Question : Assertion : The age-sex structure of human population in countries like France and Germany gives a steep pyramid Reason : In countries like Sudan and India the population is increasing at a rapid rate.
Answer» If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark a lf both Assertion & Reason are true but the reason is no t the correct explanation of the assertion, then mark b If Assertion is true STATEMENT but Reason is false, then mark c If both Assertion and Reason are false statements, then mark d. Solution :The most important DEMOGRAPHIC characteristic of a POPULATION is its age SEX structure which is also known as population pyramids. Age sex pyramids display the percentage or actual amount of a population broken down by gender and age. Developed contrices with stable population gives a steep pyramid The population of Sudan and Inida are increasing at a rapid rate. The population growth rate for Sudan is 2.60% and for India it is 1.40%

Discussion

Explore topic-wise InterviewSolutions in .

Question : Assertion : The sugar phosphatebackone of two chains in DNA double helix show anti-parallel polarity. Reason : The phosphodiester bondsin one strand go from a 3' cardon of one nucleotide to a 5, carbon of adjacent nucleotide, whereas those in complementary strand go vice versa.

Question : Assertion: The spread of AIDS can be prevented by lifelong monogamy and use of disposable syringe.Reason: AIDS spreads through heterosexuality and contaminated syringe.

Question :Assertion: The short-legged sheep is a pure breed.Reason: They appeared by mutation in one generation.

Question : Assertion: The sex of the baby is determined by the father and not by the mother. 50 per cent of sperms carry X chromosome and other 50 per cent carry the Y.

Question : Assertion: The shape of the uterus is like an inverted pear. Reason: The inner glandular layer that lines the uterine cavity is called as myometrium.

Question : Assertion : The RNAi can be introduced in an organism by insertion of gene encoding complementary RNA only Reason : There are no methods by which in vitro synthesised complementary RNA can be inserted in an organism to induce RNAi (RNA interference)

Question : Assertion: The regions outside the seminiferous tubules are called interstitial spaces, which contain Leydig's cells. Reason: Leydig's cells synthesise and secrete testicular hormones called androgens.

Question : Assertion : The rate at which a population can be expected to grow in the future canbe assessed graphically by means ofa population pyrmid. Reason : A triangular population pyramid is characteristics of a country whose population is stable, neither growing nor shrinking.

Question : Assertion: The problem of predator unlike animals.

Question : Assertion :- The process of splicing represents the dominance of RNA world. Reason:- In the process of splicing exons are removed and introns are joined in a defined order.

Question : Assertion : The predominantsite for control ofgene expression in prokaryotes is transcription initiation. Reason : The activity of RNA polymerase is regulated by accessory proteins, which affect recognition of start sites.

Question : Assertion: The ovule is antegeruc in Santalum. Reason : Ovule without integument is called anlegenic.

Question :Assertion: The person heterozygous for sickle-cell trait produces both normal (Hb^A)and abnormal haemoglobin (Hb^S).Reason: The normal allele and the sickle-allele are codominant.

Question : Assertion : The number of pioneers is little . Due to production of disseminules , the pioneers increases in number . When community is best suited for a community, it stabilizes.

Question : Assertion: The middle piece is called as power house of the sperm. Reason: The numerous mitochondria coiling around axial filament produce energy for the movement of the tail.

Question : Assertion The number of folllicles in the etaerio is many in calotropis Reason The growth of ginger rhizome is not affected by graity

Question : Assertion : The mechanism of DNA replication is semi-conservative in nature. Reason : Each of the complementary strands of the parental doublehelix is conservedduring the process.

Question : Assertion: The mechanism of origin and evolution can be suggested. Reason: Evidences of origin and evolution of life are available.

Question : Assertion: The marshes in the innovative approach also constitute a sanctuary. Reason: The marshes have a high level of biodiversity in the form of fishes, animals and birds.

Question : Assertion: The linked genes tend to get inherited together.Reason: The band between them fails to break.

Question : Assertion The imbalance in concentration of sodium and potassium ions and proteins generates the resting potential Reason To maintain unequal distribution of sodium and potassium, neurons use electrical energy

Question : Assertion : The higher concentration of O_2in the atmoshere is inhibitory to photosynthesis.

Question : Assertion:Holoblastic cleavage with almost equal sized blastomeres is a characteristic of placental animals. Reason: Eggs of most mammals, including humans, are of centrolecithal type.

Question : Assertion: The heliophytes possess high chlorophyll contents and low concentration of saIt and sugar. Reason: Due to this, plants are able to grow in shade also.

Question : Assertion :- The geologcial histroy of earth closely correlates with the biological history of earth. Reason :- Earth is very old.

Question : Assertion: The gap between the canines and premolar is called diastema. Reason: It helps in mastication and chewing of food in herbivorous animals.

Question : Assertion : The fitness according to Darwin, refers ultimately and only to reproductive fitness. Reason : Those who are better fit in an environment leave more progeny than other.

Question : Assertion: The first part of dicot embryo to appear above ground is the leaf. Reason: Leaves increase the size of plant.

Question : Assertion. The first codon discovered by Nirenberg and Mathaei was UUU. Reason. Genetic code translates the language of protein into that of RNA.

Question : Assertion : The first clinical gene for ADA therapy was given to cure SCID Reason : The normal gene was delivered into the patient's cell using retroviral vector

Question : Assertion: The female external genitalia includes mons pubis, labia majora and labia minora. Reason: The glandular tissue of each breast is divided into 5-10 mammary lobes.

Question : Assertion : The epiphytes use the trees only for attachment and manufacture their own food by photosynthesis. Reason : Commensalism results in negative effects on the growth and survival of one or both of the populations.

Question : Assertion :The enzyme helicase ,bind to the origin of replication site. Reason :Helicase separates the two strands of the DNA.

Question : Assertion :- The element is said to be deficient when present below the critical concentration. Reason:- The concentration of essential element below which plant growth is retarded is termed as critical concentration.

Question : Assertion: The environmental resistance does not allow population growth to soar towards infinity. Reason: The environmental resistance checks the biotic potential.

Question : Assertion: The embryos of fish, salamander, tortoise, chick and a man, of same age resemble one another closely. Reason: Ontogeny recapitulates phylogeny.

Question : Assertion: The endometrium undergoes cyclical changes during menstrual cycle. Reason: The myometrium exhibits strong contractions during delivery of the baby.

Question : Assertion: The earth originally had a reducing atmosphere. Reason : There was no life on the earth when it came into existance

Question :Assertion: The earliest organisms that appeared on the earth were non-green and presumably anaerobes. Reason: The first autotrophic organisms were the chemoautotrophs that never released oxygen.

Question : Assertion :- The DNA strand which does not code for anything is referred to as coding strand. Reason :- Coding strand sequence are same as RNA and this strand contain uracil at the place of thymine.

Question : Assertion. The DNA contents are usually constant in a given species. Reason. DNA replication is of continuous type.

Question : Assertion: The development in cockroach is heterometabolous metamorphosis.Reason: Young ones resemble the adults in all characters.

Question : Assertion: The cut pieces of DNA are linked with plasmJd DNA Reason: Plasmid DNA fails to act as vectors.

Question : Assertion: The chimpanzee is the closest relative of the present day humans Reason: The banding pattern in some autosomes of man and chimpanzee is remarkable similar.

Question : Assertion : The chewing and lappingmouth parts consist of a longtounge which is formed from the glossae of the labium . Reason : Thegaleae are much elongated ane coiled, each forming a half tube , which makes complete tube when both are locked together .

Question : Assertion: The cells divide without any increase in size up to morula stage. Reason: Zona pellucida remains intact till cleavage is complete.

Question : Assertion :- The backbone of polynucleotide chain is formed due to sugar and phosphate. Reason :- A nitrogenous base is linked to the pantose sugar through a N-glycosidic linkage to formed a nucleoside.

Question : Assertion :- The aquatic mammals like Dolphins whales etc. do not contain gill slits. Reason : Their adaptation to aquatic life secondary.

Question : Assertion : The age-sex structure of human population in countries like France and Germany gives a steep pyramid Reason : In countries like Sudan and India the population is increasing at a rapid rate.