24277 + Interview Questions in Biology in Class 12 Page 84 InterviewSolution

4151.	Question : There are 380 chromosomes in meiocytes of a bufferfly. How many chromosomes does male gemete of butterly have?
Answer» SOLUTION :190 CHROMOSOMES.

Discussion

4152.	Question : There are 20% adenine among the bases in a DNA fragment measuring 6.8 nm in length. The number of pentose sugars, nitrogen base pairs, phosphate groups and hydrogen bonds in this DNA fragment are respectively
Answer» 52,20,20,40 40,52,40,20 20,40,52,40 40,20,40,52 Solution :`""`3.4 mm length of DNA has = 10 bp `:.` 6.8 mm length of DNA has `=6.8/3.4 xx10` bp `=20` bp `=40` BASES `""`In 40 bases, 20% are adenine, i.e., `40xx20/100=8` adenine base are present `""`According to Chargaff's rule `A=`, so no. of T base is 8. AMONG 40 bases, 16 are `A+T`, so rest 24 would be `G+C`. `G=C` `:.` G and C would be 12 each. `""`A forms 2 H-bonds with T, so there are total 16 H-bonds between 8A and 8T. `**""`G from 3 H-bonds with C, so there are total 36 H-bonds between 12 G and 12 C. Total H-bonds `=16+36=52`.

Discussion

4153.	Question : There are 16 chromosomes in a vegetative cell of pea plant. How many chromosomes will be in the following: (i) Pollen grain (ii) Endosperm (iii) Antipodal (iv) Egg cell
Answer» Answer :(i) 8, (II) 24, (III) 8 and (iv) 8.

Discussion

4154.	Question : There are 12 pairs of cranial nerves and 36 pairs spinal nerves found in man.
Answer» True False Answer :There are 12 PAIRS of ceranial NERVES and 33 pairs SPINAL nerves found in man

Discussion

4155.	Question : There are 12 base pairs in a complete turn off DNA.
Answer» Solution :False,Correct statement:There are 10 base pairs in a COMPLETE TURN of DNA.

Discussion

4156.	Question : Theory of spontaneous generation / Abiogenesis
Answer» Solution :LIFE originated from non-living THINGS in a spontaneous manner.

Discussion

4157.	Question : TheP_(H) of venous blood is only slightly more acidic than the P_(H) of arterial blood because -
Answer» `CO_(2)` is a weak base. There is no CARBONIC anhydrase in the venous blood. The `H^(+)` generated from H2CO3 is BUFFERED by `HCO_(3)^(-)` in venous blood. The H+ generated from `H_(2)CO_(3)` is buffered by DEOXYHAEMOGLOBIN in venous blood. Answer :D

Discussion

4158.	Question : Theory of spontaneous generation explains
Answer» Life came from outer space Sponteneous GENERATION of LIVING organisms from pre-existing life on earth Sponteneous generation of living organisms from living matter OUTSIDE earth Sponteneous generation of living organisms from NON living matter on earth Answer :D

Discussion

4159.	Question : Theory of Special Creation states that
Answer» God is the creator of life ORIGIN of life is supernatural or VITALISTIC event at a particular time in the past Life is immutable and has not CHANGED ever SINCE its origin All of the above Answer :D

Discussion

4160.	Question : Theory of species creation
Answer» SOLUTION :It was believed that some SPECIAL POWER CREATED LIFE.

Discussion

4161.	Question : Theory of continuity of germplasm was propounded by
Answer» MENDEL LAMARCK WEISMANN Haeckel SOLUTION :Weismann

Discussion

4162.	Question : Theory of special creation doesn't believe in:
Answer» Changeable FAUNA and flora Constant diversity Unchangeable forms of organisms 4000 YEARS old earth Answer :A

Discussion

4163.	Question : Theory of chemical evolution is a version of theory of abiogenesis.Analyse the statement.
Answer» Solution :ACCORDING to the THEORY of chemical evolution,life ORIGINATED in water through a series of chemical reaction.Inorganic molecules combined to form ORGANIC molecules.First PRIMITIVE life originated from these organic molecules.

Discussion

4164.	Question : Theory of chemical evolution states that organisms have evolved from inorganic substances. If so, what was the atmospheric condition that favoured evolution?
Answer» Solution :The ATMOSPHERE was DEVOID of `O_2,` and with high LEVEL of `CO_2, NH_3` and UV radiations

Discussion

4165.	Question : Theory of Biogenesis explains
Answer» origin of first life Life ARISING from pre-existing lifw Life CAMERA from outer space Creation of lfe by super NATURAL power Answer :B

Discussion

4166.	Question :Theory of Abiogenesis was believed by
Answer» Aristotle Thales and Plato Von Helmont All these Answer :D

Discussion

4167.	Question : Theoretically, the modified allele could be responsible for the production ofA. a non functional enzyme B. normal or less effecient enzyme C. No enzyme at all
Answer» A only A & B only B only A,B and C Answer :D

Discussion

4168.	Question : Theodor wilhem engemann illuminated a filament of algaewith light that passed througha prismthus exposing different segments ofthe algal filament to different wavelegths of light he added aerobic bacteriaand found that these bacteria congregated in the areasilluminated by red and blue light if you ran the same experiment without passing light through a prism what would you predict
Answer» therewould be no difference in RESULTS the number of bacteria WOULD decrease along the entire lengthof the filament the bacteria would be RELATIVELY evenlydistributed along the lengtjh of the filament the number of bacteria would INCREASE along the entire length of the filament ANSWER :D

Discussion

4169.	Question : then P and Q are respectively called as.
Answer» AUTECOLOGY, Synecology Autecology, Autecology Synecology, Synecology Synecology, Autecology Answer :A

Discussion

4170.	Question : Theodore de Saussure found that
Answer» all the substance of the plant was produced from WATER and none from the soil. PLANTS have the ability to take up `COunderset(2)` from the atmosphere and RELEASE `OUNDERSET(2)` water is an essential requirement for photosynthesis to occur release of `Ounderset(2)` by plants ws possible only in sunlight Answer :C

Discussion

4171.	Question : Their function is to move particles or mucous in a specific direction over the epithelium, they are mainly present in the inner surface of hollow organs. Identify these structures and where they are found –
Answer» CILIA : STOMACH and Intestine Microvilli : Bronchioles Cilia : FALLOPIAN TUBES and bronchioles Steriocilia : Epididymis Answer :C

Discussion

4172.	Question : The zygote passes through several developmental stages till implantation. Describe each briefly with suitable diagrams.
Answer» Solution :The ZYGOTE passes through the FOLLOWING stages till implantations (i) The embryo with 8-16 blastomeres is called a morula. (ii) The morula continues to divide and transforms into blastocyst as it moves further into uterus. (iii) The blastomeres in the blastocyst are ARRANGED into a surface layer called trophblast and a cluster of interior cells attached to trophoblast are called the inner cell mass. (iv) The trophoblast layer then gets attached to the ENDOMETRIUM and inner mass cells get differentiated as embryo. (v) After attachment, the uterine cells divide rapidly to cover the blastocyst. (VI) The blastocyst. becomes embedded in the uterin endometrium. This is called implantation.

Discussion

4173.	Question : The zygospore of Chlamydomonas gives rise to
Answer» Zoospore Aplanospore Hypnospore Parthenospore Answer :1

Discussion

4174.	Question : The.arrangement of vascular bundles ina dicot root is:
Answer» Conjoint Collateral Radial Concentric Answer :C

Discussion

4175.	Question : The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called :
Answer» Pelagic zone Benthic zone Lentic one Littoral zone Solution :Littoral region is of aquatic plants located either at shore of pond or sea. So light is also obtained and also submerged in water. The plants of this shore region are connected with MANY rich producers, that are from shore to bottom level in which more of red and brown algae region. Many different regions are located in aquatic ecosystem. Pelagic region : Plants are not located in ocean or pond region or near to bottom, such region is called pelagic region. Benthic region : If is a region near pond or bottom of the sea. Where no light is AVAILABLE. Microbes and Benthic organisms are seen in this region. Lentic region : It is a region having water which is STABLE in aquatic ecosystem.

Discussion

4176.	Question : The zone of atmosphere in which the ozone layer is present is called
Answer» ionosphere mesosphere stratosphere troposphere ANSWER :C

Discussion

4177.	Question : The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called:
Answer» Pelagic zone BENTHIC zone Lentic one Littoral zone ANSWER :B

Discussion

4178.	Question : The young leaves of a fem exhibit_____vernation.
Answer» ANSWER :CIRCINATE

Discussion

4179.	Question :The yellowish fluid colostrum secreted by mother during the initial days of lactation contains antibodies (IgA) to protect the infrant,this is an example for
Answer» ACTIVE immunity passive immunity autoimmunity cell-mediated immunity Answer :B

Discussion

4180.	Question : The year 2010 has been declared as the International biodiversity year by united Nations(UN).Point out the levels of diversity in nature.
Answer» SOLUTION :GENETIC DIVERSITY, SPECIES diversity, ECOLOGICAL dioversity.

Discussion

4181.	Question : The year 2010 has been declared as the International biodiversity year by united Nations(UN).Give a brief description about the "The Evil Quartet".
Answer» SOLUTION :The Evil QUARTET. is used to DESCIRBE causes of biodiversity losses. They are (i) Habitat loss ans FRAGMENTATION, (ii)Over exploitation, (iii)Alien species invasion, (iv)Co-extinction

Discussion

4182.	Question : The year 2003 was celebrated as the 50^(th) anniversaryof discovery of
Answer» transponsons by BARBARA Mc Cliontock structure of DNA by Watson and Crick Mendel's laws of inheritance biotechnology by Kary Mullis. Solution :(b) : Watson and Crick (1953) worked out the first correct double helix model from the X-ray PHOTOGRAPHS of Wilkins andFranklin. They were AWARDED Nobel prize for the same in 1962.

Discussion

4183.	Question : The year 1900 was important for generation because of
Answer» DISCOVERY of gene Discovery of linkage Chromosomal BASIS of heredity Rediscovery of MENDEL's work Answer :D

Discussion

4184.	Question : The worst environmental hazards were created by accidents in nuclear power plant and MIC gas tragedy respectively
Answer» Russia in 1990 and BHOPAL in 1986 Ukrain in 1988 and USA in 1984 Bhopal in 1984 and Russia in 1990 Ukrain in 1986 and Bhopal in 1984 Solution :Worst environmental HAZARDS were in Ukrain in 1986 and MIC GAS tragedy in Bhopal in 1984.

Discussion

4185.	Question : The X-body was first identified by
Answer» Mendel-1856 Khoraa-1922 Griffith 1928 Henking 1891 Answer :D

Discussion

4186.	Question : The world.s most problematic aquatic weed : Terror of Bengal :: Large area of thinned Ozone layer : ...
Answer» Snow-hole Snow-blindness Ozone hole Snow-vision ANSWER :C

Discussion

4187.	Question : The world intellectual property day" is observed on(A) FEB, 29(B) APRIL, 26(C) JUNE, 30(D) SEP, 5
Answer» FEB, 29 APRIL, 26 JUNE, 30 SEP, 5 Solution :44312

Discussion

4188.	Question : The world's highly prized wool yielding, 'pashmina' breed is :
Answer» Sheep Goat Horse Cow Answer :B

Discussion

4189.	Question : The World Environment Day is observed on
Answer» `5^(TH) `july `15^(th)` May `5^(th)` JUNE `15^(th)` June Answer :c

Discussion

4190.	Question : The work of Mendel was published in year
Answer» A. 1900 B. 1901 C. 1884 D. 1866 Solution :1900

Discussion

4191.	Question : The worker arises form a fertilized eff and its larva is fed on
Answer» POLLEN HONEY MUCUS royal JELLY Answer :B

Discussion

4192.	Question :The word poultry is generally used to refer to the meat of
Answer» fowl (CHICKEN)and sheep fowl,DUCKS and goat foul, duck, TURKEY, geese and peacock only fowl, duck,Turkey,geese and some other birds Answer :D

Discussion

4193.	Question : The wonderful project which safeguarded by a citizen's group.
Answer» SOLUTION :FOAM (FRIENDS Of the Arata MARSH)

Discussion

4194.	Question : Thewood in Cycas consists of
Answer» TRACHEIDS only VESSELS only both EQUAL COMPANION cell ANSWER :A

Discussion

4195.	Question : The wings of birds and butterfies is an example of
Answer» Adaptive radiation CONVERGENT evolution divergent evolution VARIATION SOLUTION :convergent evolution

Discussion

4196.	Question : The wings of bat and bird are
Answer» homologus but not analogus analogous but not HOMOLOGOUS both homologous and analogous neither homologous nor analogous Answer :C

Discussion

4197.	Question : The wing of a bat said to be homologous to the wing of a bird and analogous to the wing of an insect. Why?
Answer» Solution : (a) Because wing of bat and bird are modified forelimbs, have same basic pattern of STRUCTURE. So they are HOMOLOGOUS. (B) Wings of bat have entirely different ORIGIN and structure. But because they HELP in flight, they have similar appearance. Hence they are analogous.

Discussion

4198.	Question : The wings of a bird and the wings of an insect are
Answer» HOMOLOGOUS structures and REPRESENT divergent EVOLUTION analogous structures and represent CONVERGENT evolution phylogenetic structures and represent divergent evolution homologous structures and represent convergent evolution Solution : analogous structures and represent convergent evolution

Discussion

4199.	Question : The 'wing'of Pinus seed is derived from
Answer» testa testa and tegmen SURFACE of ovuliferous scale All of the above Solution :(C) The winges of seed of Pinus is thin, membranous diploid and develops JOINTLY from the basal upper surface (adaxial) of ovuliferous scale and outer layer of INTEGUMENT of the ovule.

Discussion

4200.	Question : The wild varieties of plants prefer to have thorns, spines, fibres and bitterness. Why?
Answer» Solution : These characters in wild plants PROVIDE a natural PROTECTION from various GRAZERS.

Discussion

Explore topic-wise InterviewSolutions in .

Question : There are 380 chromosomes in meiocytes of a bufferfly. How many chromosomes does male gemete of butterly have?

Question : There are 20% adenine among the bases in a DNA fragment measuring 6.8 nm in length. The number of pentose sugars, nitrogen base pairs, phosphate groups and hydrogen bonds in this DNA fragment are respectively

Question : There are 16 chromosomes in a vegetative cell of pea plant. How many chromosomes will be in the following: (i) Pollen grain (ii) Endosperm (iii) Antipodal (iv) Egg cell

Question : There are 12 pairs of cranial nerves and 36 pairs spinal nerves found in man.

Question : There are 12 base pairs in a complete turn off DNA.

Question : Theory of spontaneous generation / Abiogenesis

Question : TheP_(H) of venous blood is only slightly more acidic than the P_(H) of arterial blood because -

Question : Theory of spontaneous generation explains

Question : Theory of Special Creation states that

Question : Theory of species creation

Question : Theory of continuity of germplasm was propounded by

Question : Theory of special creation doesn't believe in:

Question : Theory of chemical evolution is a version of theory of abiogenesis.Analyse the statement.

Question : Theory of chemical evolution states that organisms have evolved from inorganic substances. If so, what was the atmospheric condition that favoured evolution?

Question : Theory of Biogenesis explains

Question :Theory of Abiogenesis was believed by

Question : Theoretically, the modified allele could be responsible for the production ofA. a non functional enzyme B. normal or less effecient enzyme C. No enzyme at all

Question : then P and Q are respectively called as.

Question : Theodore de Saussure found that

Question : Their function is to move particles or mucous in a specific direction over the epithelium, they are mainly present in the inner surface of hollow organs. Identify these structures and where they are found –

Question : The zygote passes through several developmental stages till implantation. Describe each briefly with suitable diagrams.

Question : The zygospore of Chlamydomonas gives rise to

Question : The.arrangement of vascular bundles ina dicot root is:

Question : The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called :

Question : The zone of atmosphere in which the ozone layer is present is called

Question : The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called:

Question : The young leaves of a fem exhibit_____vernation.

Question :The yellowish fluid colostrum secreted by mother during the initial days of lactation contains antibodies (IgA) to protect the infrant,this is an example for

Question : The year 2010 has been declared as the International biodiversity year by united Nations(UN).Point out the levels of diversity in nature.

Question : The year 2010 has been declared as the International biodiversity year by united Nations(UN).Give a brief description about the "The Evil Quartet".

Question : The year 2003 was celebrated as the 50^(th) anniversaryof discovery of

Question : The year 1900 was important for generation because of

Question : The worst environmental hazards were created by accidents in nuclear power plant and MIC gas tragedy respectively

Question : The X-body was first identified by

Question : The world.s most problematic aquatic weed : Terror of Bengal :: Large area of thinned Ozone layer : ...

Question : The world intellectual property day" is observed on(A) FEB, 29(B) APRIL, 26(C) JUNE, 30(D) SEP, 5

Question : The world's highly prized wool yielding, 'pashmina' breed is :

Question : The World Environment Day is observed on

Question : The work of Mendel was published in year

Question : The worker arises form a fertilized eff and its larva is fed on

Question :The word poultry is generally used to refer to the meat of

Question : The wonderful project which safeguarded by a citizen's group.

Question : Thewood in Cycas consists of

Question : The wings of birds and butterfies is an example of

Question : The wings of bat and bird are

Question : The wing of a bat said to be homologous to the wing of a bird and analogous to the wing of an insect. Why?

Question : The wings of a bird and the wings of an insect are

Question : The 'wing'of Pinus seed is derived from

Question : The wild varieties of plants prefer to have thorns, spines, fibres and bitterness. Why?