24277 + Interview Questions in Biology in Class 12 Page 186 InterviewSolution

9251.	Question : Removal of anthers from the flower bud of female parent is an important step in hybridisation . (a) Name the step and explain the purpose . (b) What is the importance of bagging ?
Answer» Solution :(a) Emasculation : It is done to avoid self pollination . (b) Bagging protects the STIGMA from CONTAMINATION of unwanted POLLEN grains.

Discussion

9252.	Question : Removal of anthers from a flower during hybridization process is known as:
Answer» CROSSING EMASCULATION Isolation STERILIZATION ANSWER :C

Discussion

9253.	Question : The process of removal of anthers from the flower is called ...........
Answer» ANSWER :A::C

Discussion

9254.	Question : Removal and insertion of genes is
Answer» GENETIC engineering Biotechnology Gene therapy Cytogenetics ANSWER :A

Discussion

9255.	Question : Remnants of Nucellar tissue in seed ………… .
Answer» SOLUTION :PERISPERM

Discussion

9256.	Question : Removal and insertion of gene is
Answer» GENETIC ENGINEERING BIOTECHNOLOGY GENE therapy Cytogenetics SOLUTION :Genetic engineering

Discussion

9257.	Question : REM sleep is a / an abnormal sleep.
Answer» True False Answer :REM SLEEP is a/an NORMAL STAGE of sleep.

Discussion

9258.	Question : Remote ancestor of apes is
Answer» WATER SHREW MUSK shrew Tree shrew Mole. Answer :C

Discussion

9259.	Question : The remains of second cotyledon occur in some grasses it is called
Answer» SCUTELLUM Epiblast Coleoptile Hypocotyle Answer :B

Discussion

9260.	Question : Releasing ………. Fish is one of the ways to prevent the spread of malaria and filaria.
Answer» Promfret Tilapia Gambusia Gold fish Answer :C

Discussion

9261.	Question : Release of seminal fluid in the vagina of female is
Answer» Ejaculation Implanation Insemination Copulation. ANSWER :B

Discussion

9262.	Question : Relay of impulses to the voluntary and striated muscles is done by
Answer» Somatic NEURAL SYSTEM SYMPATHETIC neural system Parasympathetic neural system None Answer :A

Discussion

9263.	Question : Relative to roots, the shoots are massive in plants of
Answer» DESERTS MOIST TEMPERATE TUNDRA Moist TROPICAL forests Answer :d

Discussion

9264.	Question : Relative refractory period occurs during
Answer» DEPOLARISATION PHASE hyperpolarisation phase REPOLARISATION phase resting phase Answer :B

Discussion

9265.	Question : Relative growth rate is the measrue of the ability of the plant to produce new plant material so it is also referred as
Answer» ANSWER :EFFICIENCY INDEX

Discussion

9266.	Question : Relate the given statementsin thelevels of organisation a. A herdof elephantsis a population a Anelephant is ………
Answer» SOLUTION :Organsim

Discussion

9267.	Question : Relation between down fish and sea anemone:
Answer» Mutualism Commensalism Parasitism Amensalism Answer :B

Discussion

9268.	Question : Relase of second polar body from human egg occurs
Answer» Afterentry of SPERM After fertilization Before sperm entry With no RELATION to sperm entry. Answer :A

Discussion

9269.	Question : Relation between clown fish and sea anemone :
Answer» Mutualism Commensalism Parasitism Amensalism Answer :B

Discussion

9270.	Question : Rehydration therapy is a must for
Answer» Diarrahoea CHOLERA Both A and B Diarrhoea, cholera and dysentery Answer :C

Discussion

9271.	Question : Regulatory proteins are the accessory pro- teins that interact with RNA polymerase and affect its role in transcription. Which of the following statements is correct about regulatory protein?
Answer» They onlyincrease expression They only DECREASE expression They interact with RNA POLYMERASE but do not affect the expression They can ACT both as ACTIVATORS and as repressors. Answer :d

Discussion

9272.	Question : Regurgitation of food into the oesophagus from stomach is prevented by
Answer» pyloric SPHINCTER ANTERIOR oesophageal sphincter gastro-oesophageal sphincter sphincter of Oddi ANSWER :C

Discussion

9273.	Question : Regulatory proteins are the accessory proteins that interact with RNA polymerase and affect its role in transcription . Which of the following statements correct about regulatory protein ?
Answer» They only increase expression They only DECREASE expression They interact with RNA POLYMERASE but do not AFFECT the expression They can act both as ACTIVATORS and as repressors Answer :B

Discussion

9274.	Question : Regulated unit of genetic material is called
Answer» OPERATOR gene regulator gene operon promoter gene Answer :C

Discussion

9275.	Question : Regulation of lac operon by repressor is referred to as
Answer» POSITIVE regulation negative regulation feed BACK regulation none of these ANSWER :B

Discussion

9276.	Question : Regulation of gene expression occus at the level of
Answer» transcription splicing translation all of these. Answer :D

Discussion

9277.	Question : Regulation of lac operon by repressor is called
Answer» NEGATIVE regulation Positive regulation Neutral regulation Both (2) and (3) ANSWER :A

Discussion

9278.	Question : Regulated unit of genetic material is called :
Answer» OPERATOR gene Regulatory gene Operon Promotor gene Answer :C

Discussion

9279.	Question : Regeneration of hydra is
Answer» Morphollaxis by INTERSTITIAL cells EPIMORPHOSIS by interstitial cells Epimorphosis by ARCHAEOCYTES Epimorphosis by grandular cells Answer :A

Discussion

9280.	Question : Regeneration of whole plant from any part of the plant grown under sterile condition is called tissue culture.The capacity to generate a whole plant from any part cell is _____
Answer» SOLUTION :TOTIPOTENCY

Discussion

9281.	Question : Regeneration of four molecules of RuBP in C_3 cycle requires the expenditure of ATP.
Answer» 1 4 3 2 Answer :B

Discussion

9282.	Question : Regeneration of cartilage can occur from its
Answer» Matrix Plasma perichondrium A PIECE WITHOUT perichondrium Answer :C

Discussion

9283.	Question : Regeneration of a plant cell to give rise to new plant is called:
Answer» Reproduction Budding Totipotency Pleuripotency Answer :A

Discussion

9284.	Question : Regeneration of a whole plant from single cell or tissues ………….. .
Answer» SOLUTION :MICROPROPAGATION

Discussion

9285.	Question : The potential of plant cell to develop into a full plant is:
Answer» REPRODUCTION BUDDING Totipotency Pleuripotency ANSWER :C

Discussion

9286.	Question : Regeneration is possible in tadpoles for amputated
Answer» TAIL and HIND limbs Jaws and eyes Intentine Forelimbs Answer :A

Discussion

9287.	Question : Regarding to conditions for growth in flowering plants which of the following is incorrect ?
Answer» Oxygen is required for sufficient ENERGY production Water STATUS of cell should be healthy Level of ESSENTIAL elements should ALSO be appropriate DNA content of cell should be high Answer :D

Discussion

9288.	Question : Regeneration after injury is absent in
Answer» NERVOUS tissue Skin epidermis Tendon Smooth.muscles Answer :A

Discussion

9289.	Question : Regarding cerebrospinal fluid, which of the following is a false statement?
Answer» It has a SPECIFIC gravity of 1.007 and buoys the brain It maintains a volume of 140 to 200 mL and a fluid PRESSURE of 10 MM Hg It moves metabolic wastes away from the cells o nervous tissue It is PRODUCED in the choroid plexuses and drains into the cerebral arterial circle Answer :B

Discussion

9290.	Question : Regarding human cardiac cycle, which of the following statements is false :
Answer» The time TAKEN for ONE cardiac cycle is reduced in tachycardia The time INTERVAL for joint diastole in HEART is about 0.4 seconds The time interval for joint systole in heart is about 0.4 second Left ventricle TAKES 0.5 seconds to complete one diastole Answer :C

Discussion

9291.	Question : Refrigerated fruits maintain flavor and taste for longer period due to
Answer» non - AVAILABILITY of `O_(2)` PRESENCE of excess of `CO_(2)` presence of excess humidity slower RATE of respiration Answer :D

Discussion

9292.	Question : Reflex action involves
Answer» MEDULLA oblongata cerebellum optoc lobe spinal cord Answer :D

Discussion

9293.	Question : Referthe given reaction RuBP +O_2 overset("RuBP") underset ("Oxygenase")rarrPhosphoglyceric acid +Phosphoglycolic and In is the first reaction of
Answer» `C_3` PATH WAY `C_4` PATHWAY `C_5` pathway GLYCOLYSIS ANSWER :A

Discussion

9294.	Question : Refer to the given steps of DNAstrands (i) Exposure of DNA strands (ii) Synthesis of RNA primer (iii) Activation of deoxyribonucleotides (iv) Chain formatiion (v) Base pairing (vi) Proof reading and DNA repair ltviigt DNA polynerase attaches at Ori site Select the correct sequence of DNA replication.
Answer» `(vii)to(iii)to(i)to(ii)to(V)to(IV)to(vi)` `(iii)to(i)to(vii)to(ii)to(v)to(iv)to(vi)` `(vii)to(i)to(iii)to(ii)to(v)to(iv)to(vi)` `(i)to(iii)to(ii)to(vii)to(v)to(iv)to(vi)` SOLUTION :(a)

Discussion

9295.	Question : Refer to the given schematic representation of menstrual cycle showing three phases, I,II and III. Select the option that correctly matches these phases with the following events (i) FSH secreted by the anterior pituitary stimulates the ovarian follicle to secrete estogen which stimulates the proliferation of the endometrium (ii) LH secreted by the anterior pituitary stimulates the development of corpus luteum which secretes progesterone (iii) Reduced production of LH from anterior pituitary causes degeneration of corpus luteum, thereby progesterone production is reduced.
Answer» `{:("PHASE IPhase IIPhase III"),("(i)(II)(iii)"):}` `{:("Phase IPhase IIPhase III"),("(iii)(i)(ii)"):}` `{:("Phase IPhase IIPhase III"),("(ii)(iii)(i)"):}` `{:("Phase IPhase IIPhase III"),("(iii)(ii)(i)"):}` ANSWER :C

Discussion

9296.	Question : Refer to the given statements and select the correct ones. (i) Fossils are remains of hard parts of life forms in rocks. (ii) Dinosaurs disappeared about 65 mya. (iii) Animals called lobe fins evolved into reptiles. (iv) Study of fossils is called palaentology.
Answer» I,II and iv ii and iv i,iii and iv NONE of these Solution :N//A

Discussion

9297.	Question : Refer to the given sequence of steps and select the correct option.
Answer» `{:("(i)","(ii)","(iii)"),("REPLICATION","Transcription","TRANSLATION"):}` `{:("(i)","(ii)","(iii)"),("Replication","Processing","Translation"):}` `{:("(i)","(ii)","(iii)"),("Transcription","Splicing","Translation"):}` `{:("(i)","(ii)","(iii)"),("Transcription","Replication","Translation"):}` Solution :(C) DNA containsgenetic informationwhich is transcribed via MRNA . mRNA is not made directly in eukaryotic cell , It is transcribed in the nucleus ahnRNA aswhich contains introns and exons . The introns which CONTAIN are

Discussion

9298.	Question :Refer to the given reaction . 2H_(2) O rarr 4H^(+) +O_(2) +4e^(-) Where does this reaction take place in the chloroplasts of plants ?
Answer» Outer SURFACE of thylakoid membrane Inner surface of thylakoid membrane In the matrix (STROMA) Intermembrane space Answer :B

Discussion

9299.	Question : Refer to the given mRNA segment It can be translated completely into a polypeptide. Which of the following codons may correspond with A and B ?
Answer» A-AUG, GUG, B-UA A, UAG or UGA A-U A A ,UGA, B-AUG, GUG or UAG A-AUG,UGA, B-GUG, UA A or UGA A-AUG, GAG, B-U A A,U U Uor UGA Answer :a

Discussion

9300.	Question : Referto the given figure This type of sex determination is found in
Answer» grasshoppers and cockroaches birds and reptiles butterflies and moths honeybess, ants and wasps Solution :Haploid-diploid mechanism or Haplodiploidy is a unique phenomenon in which an unfertilised egg develop into a MALE and a fertilised egg develops into a female. Therefore, the female is diploid (2n), and the male is haploid (n), Eggs are formed by meiosis and sperms by mitosis. Fertilisation RESTORES the diploid number of chromosomes in ZYGOTE which gives rise to the female. If the egg is not fertilized, it will still develop but into a male (arrhenotoky or arrhenotokous parthenogensis). It is seen in hymenopterous INSECTS, such as beeds, wasps, saw flies and ants.

Discussion

Explore topic-wise InterviewSolutions in .

Question : Removal of anthers from the flower bud of female parent is an important step in hybridisation . (a) Name the step and explain the purpose . (b) What is the importance of bagging ?

Question : Removal of anthers from a flower during hybridization process is known as:

Question : The process of removal of anthers from the flower is called ...........

Question : Removal and insertion of genes is

Question : Remnants of Nucellar tissue in seed ………… .

Question : Removal and insertion of gene is

Question : REM sleep is a / an abnormal sleep.

Question : Remote ancestor of apes is

Question : The remains of second cotyledon occur in some grasses it is called

Question : Releasing ………. Fish is one of the ways to prevent the spread of malaria and filaria.

Question : Release of seminal fluid in the vagina of female is

Question : Relay of impulses to the voluntary and striated muscles is done by

Question : Relative to roots, the shoots are massive in plants of

Question : Relative refractory period occurs during

Question : Relative growth rate is the measrue of the ability of the plant to produce new plant material so it is also referred as

Question : Relate the given statementsin thelevels of organisation a. A herdof elephantsis a population a Anelephant is ………

Question : Relation between down fish and sea anemone:

Question : Relase of second polar body from human egg occurs

Question : Relation between clown fish and sea anemone :

Question : Rehydration therapy is a must for

Question : Regulatory proteins are the accessory pro- teins that interact with RNA polymerase and affect its role in transcription. Which of the following statements is correct about regulatory protein?

Question : Regurgitation of food into the oesophagus from stomach is prevented by

Question : Regulatory proteins are the accessory proteins that interact with RNA polymerase and affect its role in transcription . Which of the following statements correct about regulatory protein ?

Question : Regulated unit of genetic material is called

Question : Regulation of lac operon by repressor is referred to as

Question : Regulation of gene expression occus at the level of

Question : Regulation of lac operon by repressor is called

Question : Regulated unit of genetic material is called :

Question : Regeneration of hydra is

Question : Regeneration of whole plant from any part of the plant grown under sterile condition is called tissue culture.The capacity to generate a whole plant from any part cell is _____

Question : Regeneration of four molecules of RuBP in C_3 cycle requires the expenditure of ATP.

Question : Regeneration of cartilage can occur from its

Question : Regeneration of a plant cell to give rise to new plant is called:

Question : Regeneration of a whole plant from single cell or tissues ………….. .

Question : The potential of plant cell to develop into a full plant is:

Question : Regeneration is possible in tadpoles for amputated

Question : Regarding to conditions for growth in flowering plants which of the following is incorrect ?

Question : Regeneration after injury is absent in

Question : Regarding cerebrospinal fluid, which of the following is a false statement?

Question : Regarding human cardiac cycle, which of the following statements is false :

Question : Refrigerated fruits maintain flavor and taste for longer period due to

Question : Reflex action involves

Question : Referthe given reaction RuBP +O_2 overset("RuBP") underset ("Oxygenase")rarrPhosphoglyceric acid +Phosphoglycolic and In is the first reaction of

Question : Refer to the given statements and select the correct ones. (i) Fossils are remains of hard parts of life forms in rocks. (ii) Dinosaurs disappeared about 65 mya. (iii) Animals called lobe fins evolved into reptiles. (iv) Study of fossils is called palaentology.

Question : Refer to the given sequence of steps and select the correct option.

Question :Refer to the given reaction . 2H_(2) O rarr 4H^(+) +O_(2) +4e^(-) Where does this reaction take place in the chloroplasts of plants ?

Question : Refer to the given mRNA segment It can be translated completely into a polypeptide. Which of the following codons may correspond with A and B ?

Question : Referto the given figure This type of sex determination is found in