24277 + Interview Questions in Biology in Class 12 Page 194 InterviewSolution

9651.	Question : Ration obtained in a dihybrid cross.
Answer» SOLUTION :`9:3:3:1`

Discussion

9652.	Question : Ratio of recessive epistasis is ............
Answer» `12:3:1` `9:7` `9:3:4` `9:6:1` ANSWER :C

Discussion

9653.	Question : Ratio of progeny , when a red coloured heterozygote is crossed with a white coloured plant in which red colour is dominant to white colour :
Answer» `3:1` `1:1` `1:2:1` `9:3:3:3:1` ANSWER :B

Discussion

9654.	Question : Ratio of progeny when ared .coloured heterozygote is crossed with a white coloured plant in which red colour is dominant to white colour
Answer» 3:I I:1 1:2:I 9:3:3:1 Answer :B

Discussion

9655.	Question : Ratio of dominant and recessive for both character plants in F_(2) generation of dihybrid cross :-
Answer» `1:1` `5:3` `9:1` `3:1` ANSWER :C

Discussion

9656.	Question : Ratio between volume of CO_2 evolved to volume of O_2 consumed during respiration.
Answer» ANSWER : RESPIRATORY QUOTIENT

Discussion

9657.	Question : Ratio of DNA: Histone is roughly 1:1 in eukaryotic chromosome. In prokaryotes it is
Answer» `1:2` `2:1` `1:0` `2:0` ANSWER :C

Discussion

9658.	Question : Ratio between mortality and natality is
Answer» POPULATION ratio census proportation vital index density coefficient Answer :C

Discussion

9659.	Question : Ratio between mortality and natality is called
Answer» POPULATION ratio VITAL index Density eoefficienl Census ratio ANSWER :B

Discussion

9660.	Question : Rather than the number of individuals, the per cent cover or biomass is a more meaningful measure of the population density in cases where
Answer» counting the NUMBER of individuals is impossible counting the number of individuals is very TIME consuming number of individuals is a meaningless measure to COMPARE two different populations all the above Answer :D

Discussion

9661.	Question :Rate of upward movement of water through the xylem in the plants may reach upto
Answer» 15 m/hr 1.5 m/hr 15 m/min 1.5 m/min ANSWER :A

Discussion

9662.	Question : Rate of photosynthesis is independent of
Answer» Duration of light INTENSITY of light TEMPERATURE RESPIRATION Answer :D

Discussion

9663.	Question : Rate of imbibition is more in
Answer» PROTEIN Carbohydrates Cellulose None of these Answer :A

Discussion

9664.	Question : Rate of formation of organic matter by rabbit in a grassland is
Answer» Gross primary PRODUCTION Net primary production Net PRODUCTIVITY SECONDARY productivity SOLUTION :Net productivity

Discussion

9665.	Question : Rate of growth in plants is measured by _____
Answer» ANSWER :AUXANOMETER

Discussion

9666.	Question : Rate of decomposition process is decreased by
Answer» AEROBIC ENVIRONMENT Rich AMOUNT of lignin chitin in detritus Warm and humid environment All of these SOLUTION :Rich amount of lignin chitin in detritus

Discussion

9667.	Question : Rate of diffusion of gases is not influenced by
Answer» PRESSURE gradient Solubility of gases Thickness of OLFACTORY membrane Distance of diffusion Answer :C

Discussion

9668.	Question : Rate of biomass production per unit area over a time period by plant by photosynthesis is called _____
Answer» SOLUTION :PRIMARY PRODUCTIVITY

Discussion

9669.	Question : Rate of biomass production is called productivity and can be divided into GPP and NPP : How can we relate GPP and NPP
Answer» SOLUTION :NPP = GPP -R

Discussion

9670.	Question : Rate of biomass production is called productivity and can be divided into GPP and NPP : Define Gpp and NPP
Answer» Solution :GPP - Gross PRIMARY PRODUCTIVITY NPP - NET primary productivity

Discussion

9671.	Question : Rashid isolated a natural plasmid from a bacterium and is planning to facilitate cloning .a. What are the minimum requirements for considering the isolated plas-mid as a vector ?How he identifies whether a foreign DNA is inserted or not after clon-ing ?
Answer» Solution :a. The isolated PLASMID MUST have the following features. i. Origin of replication ii. Selectable market iii.Cloning sites b. Recombination can be identified using antibiotic resistance. When INSERTION is done at tetracyclineresistance GENE site, the transfor-mants will not show antibiotic resistance when placed in tetracycline containing MEDIUM . Recombination can also be identified using insertional inactivation method. The plasmid will give a blue colour to the colony if there is no inserted foreign DNA .

Discussion

9672.	Question : Rare endangered and endemic taxa can be found intact and flourishing in
Answer» SACRED groves BUFFER zone TROPICAL forests temperate forests Answer :A

Discussion

9673.	Question : Rapid propagation of plants by tissue culture methods.
Answer» ANSWER :MICROPROPAGATION

Discussion

9674.	Question : Rare and intergeneric hybrid embryo grows well:
Answer» INSIDE ovule of mother plant In suitable nutrient rich culture mediumOutside the SEED coat Solution :Rate and intergeneric hybrid embryo grows well in culture medium where they get all required nutrients auxins, cytokinins and natural extracts during its growth, development and DIFFERENTIATION. Culture medium provides more hospitable environment than the ovule or OVARY.

Discussion

9675.	Question : Rapid increases in human population is called population explosion.Given reason .
Answer» Solution :Rapid DECLINE in death RATE Decline in INFANT MORTALITY Rate (IMR) Disease control by medical facility. Better AVAILABILITY of food.

Discussion

9676.	Question : Rapid increases in human population is called population explosion.Write two methods to control over population.
Answer» SOLUTION :Raising the marriageable AGE Implement family PLANNING PROGRAMMES.

Discussion

9677.	Question : Raphanobrassica is an example for ………… .
Answer» (a) AUTOPOLYPLOID (B) ALLOPOLYPLOID (C) POLYPLOID (d) Polysomy Answer :B

Discussion

9678.	Question : Rapid increase in human population is called _____.
Answer» ANSWER :POPULATION EXPLOSION

Discussion

9679.	Question : Rapid decline in a population due to high mortality rate is called:
Answer» POPULATION density Population crash Population explosion All of these Answer :B

Discussion

9680.	Question :Raphe is :
Answer» PART of flower Funicle ATTACHED to ovule Ridge FORMED by FUNICULUS on ovule Part of nucellus Answer :C

Discussion

9681.	Question : Raphanobrassica is an example of intraspecific hybridization.
Answer» True False Answer :intergeneric

Discussion

9682.	Question : Raphano brassica is an allotetraploid got by _______treatment.
Answer» SOLUTION :COLCHICINE

Discussion

9683.	Question : Ranikhet disease is caused by
Answer» bacteri VIRUS fungus parasite Answer :B

Discussion

9684.	Question : Ranikhet is a disease of
Answer» POULTRY Fishery Apiculture Cattles Answer :A

Discussion

9685.	Question : Random genetic drift in a population probably results from
Answer» SMALL POPULATION SIZE highly genetically VARIABLE individuals interbreeding within this population constant low mutation rate Solution : small population size

Discussion

9686.	Question : Random change in gene/allelic frequency occurring by chance but not under the control of natural selection is called
Answer» GENETIC drift Natural selection Isolation Adaptive radiation Answer :A

Discussion

9687.	Question : Ramu while observing the C.S of anther of Datura through a microscope, found four wall layers. Name the layers.
Answer» SOLUTION :1) epidermis 2) ENDOTHECIUM 3) middle LAYER 3) TAPETUM

Discussion

9688.	Question : Ramu cultivated pea plants as an intercrop in his paddy field. After harvesting. he alllowed the roots of the pea plants to remain in the soil for some period. Justify your answer.
Answer» SOLUTION :Rhixobium LIVING in the root nodules of the pea plant can FIX atmospheric nitrogen into nitrates and INCREASE the fertility of SOIL.

Discussion

9689.	Question : Ram's blood cells do not agglutinate with addition of either anti-A or anti-B serum. However, serum collected from Ram causes agglutination of RCBs collected from another person. Based on the above information, blood group of Ram is most likely.
Answer» A B O AB Answer :C

Discussion

9690.	Question : Ramu cultivated pea plants as an inter crop in his paddy field. After harvesting, he allowed the roots of the pea plants remain in the soil for some period. a. Is the action of Ramu reasonable? b. Justify your answer.
Answer» Solution :a. Yes B. Rhizobium roots nodules in the pea plant can FIX atomospheric nitrogen into nitrates and increase fertility of the SOIL.

Discussion

9691.	Question : Ramesh tried to propage sugarcane vegetively by sowing a segment of stem having internodal region only. Suresh tired the same by sowing a segment of stem having an internode. who choos the correct segment and why ?
Answer» Solution : SURESH has chosen the correct SEGMENT of sugarcane stem. It is because the bud FORMATION TAKES PLACE at hte nodeof the stem.

Discussion

9692.	Question : Ramapithecus and Dryopithecus were existing before how many years ago?
Answer» 50 mya 70000 YEARS ago 15 mya 10000 years ago Answer :C

Discussion

9693.	Question : Ramesh Chandra Dagar - Organic farming Ahmed khan - _____
Answer» SOLUTION :POLYBLEND

Discussion

9694.	Question : Raman is learning the post fertilization changes of an angiosperm embryo sac with the help of slides. He identified the egg nucleus and polar nuclei with the help of his teacher. (a) Name the other nuclei present in the embryo sac . (b) Help Raman by listing the changes that take place with egg nucleus and polar nuclei after fertilization .
Answer» Solution :(A) SYNERGIDS and ANTIPODALS (b)Egg nucleus + Male gamete `rarr`Zygote `rarr` Embryo Polar NUCLEI + Male gamete `rarr` Primary endosper nucleus `rarr` ENDOSPERM

Discussion

9695.	Question : Raman is learning the post fertilization changes of an angiosperm embryo sac with the help of slides. He identified the egg nucleus and polar nuclei in the central cell with the help of his teacher. Help raman by giving the changes that take place with egg nucleus and polar nuclei.
Answer» SOLUTION :one male gamete fused with an egg NUCLEUS and from diploid ZYGOTE is called syngamy. 2nd male gamete fused with two polar nuclei in the central CELL and form triploid primary endosperm nucleus. (PEN) is called triple fusion.

Discussion

9696.	Question : Raman is learning the post fertilization changes of an angiosperm embryo sac with the help of slides. He identified the egg nucleus and polar nuclei in the central cell with the help of his teacher. Name the other nuclei present in the embryo sac.
Answer» SOLUTION :SYNERGIDS and ANTIPODALS.

Discussion

9697.	Question : Ram Singh is a conventional wheat breeder. One of the promising wheat varieties is found to be susceptible to leaf rust. What breeding steps he will adopt to make his original promising variety resistant to leaf rust?
Answer» Solution :RAM Singh may be either adopt CONVENTIONAL breeding techniques or mutation breeding techniques. Steps of conventional breeding 1. SCREENING of germ plasm 2. Hybridisation of selected parent 3. SELECTION and evaluation of hybrid 4. Testing and reease new varieties.

Discussion

9698.	Question : Rakesh's parents have normal colour vision. But his maternal grandfather is colour -blind. What is the possibility of Rakesh and his siblings becoming colour-blind?
Answer» Solution :1. Data given: Rakesh's maternal GRANDFATHER is colour-blind, therefore he is `x^(c)Y`. His daughter would be carrier for colour-blindness. Therefore, Rakesh's mother will be `X^(c)C`. 2. Rakesh's father is normal, therefore his genotype will be XY. Upon crossing a carrier woman with normal man we obtain FOLLOWING result: `X^(c)X` with `XY=X^(c)Y,X^(c)X,XX,XY` 3. Since colour-blindness shows criss-cross inheritance, Rakesh and his brothers stand a 50% possibility of being colour-blind, while his SISTERS also have 50% possibility of becoming CARRIERS of the disorder.

Discussion

9699.	Question : Raju was suffering from following symptoms, heaviness in the chest, also in the region of neck, lower jaw, left arm and left shoulder. What does this indicate?
Answer» SOLUTION :Raju will be diagnosed for ANGINA pectoris after CONFIRMING his SYMPTOMS.

Discussion

9700.	Question : Raju went to a rice research station on his study tour. There he noticed a scientist working on rice plants using scissors and forceps. To his surprise he saw the scientist covering the inflorescence with paper bags. Give the purpose of these techniques.
Answer» SOLUTION :Emasculation which prevents the contamination of stigma by UNWANTED pollen/to COMBINE the desirable CHARACTERS to produce a superior variety in hybridisation.

Discussion

Explore topic-wise InterviewSolutions in .

Question : Ration obtained in a dihybrid cross.

Question : Ratio of recessive epistasis is ............

Question : Ratio of progeny , when a red coloured heterozygote is crossed with a white coloured plant in which red colour is dominant to white colour :

Question : Ratio of progeny when ared .coloured heterozygote is crossed with a white coloured plant in which red colour is dominant to white colour

Question : Ratio of dominant and recessive for both character plants in F_(2) generation of dihybrid cross :-

Question : Ratio between volume of CO_2 evolved to volume of O_2 consumed during respiration.

Question : Ratio of DNA: Histone is roughly 1:1 in eukaryotic chromosome. In prokaryotes it is

Question : Ratio between mortality and natality is

Question : Ratio between mortality and natality is called

Question : Rather than the number of individuals, the per cent cover or biomass is a more meaningful measure of the population density in cases where

Question :Rate of upward movement of water through the xylem in the plants may reach upto

Question : Rate of photosynthesis is independent of

Question : Rate of imbibition is more in

Question : Rate of formation of organic matter by rabbit in a grassland is

Question : Rate of growth in plants is measured by _____

Question : Rate of decomposition process is decreased by

Question : Rate of diffusion of gases is not influenced by

Question : Rate of biomass production per unit area over a time period by plant by photosynthesis is called _____

Question : Rate of biomass production is called productivity and can be divided into GPP and NPP : How can we relate GPP and NPP

Question : Rate of biomass production is called productivity and can be divided into GPP and NPP : Define Gpp and NPP

Question : Rashid isolated a natural plasmid from a bacterium and is planning to facilitate cloning .a. What are the minimum requirements for considering the isolated plas-mid as a vector ?How he identifies whether a foreign DNA is inserted or not after clon-ing ?

Question : Rare endangered and endemic taxa can be found intact and flourishing in

Question : Rapid propagation of plants by tissue culture methods.

Question : Rare and intergeneric hybrid embryo grows well:

Question : Rapid increases in human population is called population explosion.Given reason .

Question : Rapid increases in human population is called population explosion.Write two methods to control over population.

Question : Raphanobrassica is an example for ………… .

Question : Rapid increase in human population is called _____.

Question : Rapid decline in a population due to high mortality rate is called:

Question :Raphe is :

Question : Raphanobrassica is an example of intraspecific hybridization.

Question : Raphano brassica is an allotetraploid got by _______treatment.

Question : Ranikhet disease is caused by

Question : Ranikhet is a disease of

Question : Random genetic drift in a population probably results from

Question : Random change in gene/allelic frequency occurring by chance but not under the control of natural selection is called

Question : Ramu while observing the C.S of anther of Datura through a microscope, found four wall layers. Name the layers.

Question : Ramu cultivated pea plants as an intercrop in his paddy field. After harvesting. he alllowed the roots of the pea plants to remain in the soil for some period. Justify your answer.

Question : Ram's blood cells do not agglutinate with addition of either anti-A or anti-B serum. However, serum collected from Ram causes agglutination of RCBs collected from another person. Based on the above information, blood group of Ram is most likely.

Question : Ramu cultivated pea plants as an inter crop in his paddy field. After harvesting, he allowed the roots of the pea plants remain in the soil for some period. a. Is the action of Ramu reasonable? b. Justify your answer.

Question : Ramesh tried to propage sugarcane vegetively by sowing a segment of stem having internodal region only. Suresh tired the same by sowing a segment of stem having an internode. who choos the correct segment and why ?

Question : Ramapithecus and Dryopithecus were existing before how many years ago?

Question : Ramesh Chandra Dagar - Organic farming Ahmed khan - _____

Question : Raman is learning the post fertilization changes of an angiosperm embryo sac with the help of slides. He identified the egg nucleus and polar nuclei in the central cell with the help of his teacher. Help raman by giving the changes that take place with egg nucleus and polar nuclei.

Question : Raman is learning the post fertilization changes of an angiosperm embryo sac with the help of slides. He identified the egg nucleus and polar nuclei in the central cell with the help of his teacher. Name the other nuclei present in the embryo sac.

Question : Ram Singh is a conventional wheat breeder. One of the promising wheat varieties is found to be susceptible to leaf rust. What breeding steps he will adopt to make his original promising variety resistant to leaf rust?

Question : Rakesh's parents have normal colour vision. But his maternal grandfather is colour -blind. What is the possibility of Rakesh and his siblings becoming colour-blind?

Question : Raju was suffering from following symptoms, heaviness in the chest, also in the region of neck, lower jaw, left arm and left shoulder. What does this indicate?

Question : Raju went to a rice research station on his study tour. There he noticed a scientist working on rice plants using scissors and forceps. To his surprise he saw the scientist covering the inflorescence with paper bags. Give the purpose of these techniques.