24277 + Interview Questions in Biology in Class 12 Page 306 InterviewSolution

15251.	Question : In the context of evolution, what is the most important source of new mutations?
Answer» EXPOSURE to X-ray Exposure to chemicals The mispairing of CHROMOSOMES during meiosis Errors during DNA replicatin Answer :D

Discussion

15252.	Question : In the chart given below , 'AA, are the genes in a chromosome of Pisum sativum. Observe the chart and mention the genetic phenomenon does it indicates.
Answer» SOLUTION :Pleirophy - A SINGLE affecting MANY traits. Here the single gene AA controls the traits for flower colour, seed colour and leaf axif spot.

Discussion

15253.	Question : In the cell mediated immuno response, T-lymphocytes divide and secrete
Answer» ANTIGENS Plasmogens Collagens CYTOKINES SOLUTION :Cytokines

Discussion

15254.	Question : In the cell mediated immuno response, T- lymphocytes divide and secrete
Answer» antigens plasmogens collagens cytokines Answer :D

Discussion

15255.	Question : In the cell cycle mitochondria and chloroplasts divide during ____
Answer» ANSWER :`G_2` PHASE

Discussion

15256.	Question : In the case of the 'Swiss cheese' with large hole is due to the production of
Answer» `CO` `CO_2` `CH_4` `C_2H_5OH` ANSWER :B

Discussion

15257.	Question : In the case of certain diseases like mumps, measles and chicken pox, the secondary immune response gives a life long immunity. Give the scientific reason behind this.
Answer» Solution :Our body PRODUCES the T-lymphocytes against the antigen i.e., chicken POX causing agent and they attack and destroy the antigen. Some of the T-cells get differentiated into memory T-cells. These cells are STORED in the LYMPH nodes and spleen. They recognise and produce antibodies when the same attack the body a second time. This is a very rapid process. Memory T-cells have a long life. These cells are responsible for the life long immunity to certain diseases like chicken pox, measles and mumps.

Discussion

15258.	Question : In the C_4 - plants , C_4 cycle occurs in the mesophyll cells and C_3 - cycle occurs in bundle sheath cells, whereas in CAM plants .
Answer» `C_4 and C_3` - cycles OCCUR in the MESOPHYLL CELLS only `C_4`- cycle occurs in bundle sheath cells and `C_3` - cycle in mesophyll cells `C_4` - cycle very RARELY `C_4 and C_3` - cycles occur in bundle sheath cells Answer :A

Discussion

15259.	Question : In the blind spot where the optic nerve leaves the eye :-
Answer» RODS and CONES are absent Only cones are present Only rods are present Special NEURONS are present Answer :A

Discussion

15260.	Question : In the beginning how was higher food production obtained by human beings?
Answer» By agriculture By ANIMAL HUSBANDRY Both (A) and (B) NONE SOLUTION : Both (A) and (B)

Discussion

15261.	Question :In the area of plant breeding, it is important not only to preserve the seeds of the variety being cultivated, but also to preserve all its wild relatives. Explain with a suitable example.
Answer» Solution :In the AREA of plant BREEDING, it is IMPORTANT not only to PRESERVE the seeds of the variety being cultivated, but also to preserve all its wild relatives because SEVERAL wild relatives of different cultivated species of plants seem to have certain resistant characters but their yields are very low. Hence, there is a need to introduce the resistant genes into the highyielding cultivated varieties.

Discussion

15262.	Question : In the area of plant breeding, it is important not only to preserve seeds of the variety being cultivated, but also to preserve all its wild relatives. Explain with suitable example.
Answer» Solution :Because WILD relatives of CULTIVATED PLANTS, have some genes that provide them herbicide tolerance or pest RESISTANCE and resistance against ENVIRONMENTAL stress

Discussion

15263.	Question : In the animal world, some organisms have both male and female repro-ductive organs. a. What do you call such organisms? b. Give two examples.
Answer» SOLUTION :a. Hermaphrodites b. EARTH worm, sponges ETC.

Discussion

15264.	Question : In the angiosperm ovule central cell of the , embryo sac, prior to the entry of pollen tube, contains:
Answer» A single haploid nucleus ONE DIPLOID and one haploid nucleus Two haploid POLAR nuclei One diploid secondary nucleus Answer :C

Discussion

15265.	Question : In……. The adjacent stipules of two opposite leaves are fused
Answer» IXORA HIBISCUS LATHYRUS PISUM ANSWER :A

Discussion

15266.	Question : In the ancient atmosphere, free nitrogen, exygen and carbon dioxide were not present because
Answer» of the large AMOUNT of hydrogen and high temperature carbon would have combined with hydrogen to FORM METHANE any free oxygen would have combined with iron, silicon, All of the above ANSWER :D

Discussion

15267.	Question : In the alveoli, dissociation of CO_(2) from carbamino haemoglobin occur, due to
Answer» `P_(CO_(2))` is HIGH and `P_(O_(2))` P is low `P_(CO_(2))` is low and `P_(O_(2))` is high `P_(CO_(2))` and `P_(O_(2))`are high `P_(CO_(2))` and `P_(O_(2))`are low Answer :B

Discussion

15268.	Question : In the above given pedigree, assume that no outsider marrying in, carry a disease. Write the genotypes of II and III
Answer» All `X^(d)Y` `X^(D)Y" and "X^(D)X^(d)` `X^(d)XX^(d)Y" and "X^(d)Y^(D)` `X^(d)X^(d)" and "X^(d)Y` ANSWER :C

Discussion

15269.	Question : In the 1950s, there were hardly any mosquitoes Delhi. The use of the pesticide DDT on standing water killed their larve. It is believed that now there are mosquitoes because they evolved DDT resistance through the interaction of mutation and Natural Selection. Pointwise. state in a sequence how that could have happened.
Answer» Solution :Certain LARVAE born with mutation which conferred resistance to DDT: DDT sensitive larvae DIED, DDT resistant larvae COMPLETED life history and became adult MOSQUITOES: natural selection caused greater REPRODUCTION of DDT resistant mosquitoes which soon replaced DDT sensitive mosquitoes.

Discussion

15270.	Question : In the above diagram A & B represent respectively
Answer» Mesophyll cells in upper EPIDEMICS & LOWER epidermis Mesophyll cells in temperature & tropical plant leaves CHLOROPLAST alignment at HIGH & low light in tensity Variation in Chloroplast NUMBER in different seasons Answer :C

Discussion

15271.	Question : In the 1940s, Johannes van Overbeek stimulated growth in plant embryos with coconut milk. In the 1950s, Folke Skoog and Carlos O Miller stimulated cell division in tobacco plants with degraded DNA. The active ingredient in both stimulants, which was a modified
Answer» adenine auxin ribosic ACID phosphate Answer :A

Discussion

15272.	Question : In whom is testis found inside the abdomen.
Answer» Elephant Mouse Horse Dog Answer :A

Discussion

15273.	Question : In the 18th century who suggested that modifications arise by the reaction of organism with the environment?
Answer» ANSWER :ERASMUS DARWIN

Discussion

15274.	Question : In terms of changes in gene frequencies, founder events result in
Answer» gradual accumulation of many SMALL changes LARGE RAPID changes polyploidy hybridisation Answer :B

Discussion

15275.	Question : In testes,the newly formed sperms are temporarily stored in.....
Answer» RETE testis Seminiferous tubule Epididymis vas deferens Answer :C

Discussion

15276.	Question : In terms of permeability, the cell wall and plasmalemma are :
Answer» PERMEABLE and DIFFERENTIALLY permeable Both semipermeable Semipermeable and permeable Both differentially permeable differentially Answer :A

Discussion

15277.	Question : In telophase stage chromosomes decondense and lose their individuality.
Answer» ANSWER :1

Discussion

15278.	Question : In term saltatory conduction, saltatory means running.
Answer» True False Answer :In TERM saltatory CONDUCTION, saltatory MEANS LEAPING.

Discussion

15279.	Question : In taxonomy the first step is :-
Answer» Identification Nomenclature Classification Affinities ANSWER :D

Discussion

15280.	Question : In tailing, about ____________ adenylate residues are added at3'-end in a template independent manner on hnRNA
Answer» `1000-2000` `10 - 15` `200-300` `3000-3500` ANSWER :C

Discussion

15281.	Question : In tall plants, because of which factor, continuous water coloum extends upwards ?
Answer» ATMOSPHERIC pressure Osmotic pressure Suction pull root pressure Answer :C

Discussion

15282.	Question :In Taenia Self-fertilisation lakes place
Answer» Between TWO GRAVID proglottids Within same gravid proglottid Within same mature proglottid Between two immature proglottids ANSWER :C

Discussion

15283.	Question : In synsndrous condition, three is fusion of
Answer» FILAMENTS only Both filaments and anthers Anthers only ANTHER TIPS only ANSWER :B

Discussion

15284.	Question : In sycon , choanocytes from lining of
Answer» INCURRENT CANAL spongocoel Radial canal FLAGELLATED chamber Answer :C

Discussion

15285.	Question : In sweat pea, genes C and P are necessary for colour in flowers. The flowers are white in the absence of either or both the genes. What will be the percentage of coloured flowers in the offspring of the cross C c p p xx c c P p ?
Answer» `75 %` `25 %` `100 %` `50 %` ANSWER :B

Discussion

15286.	Question : In suspension culture, the culture is constantly agitated to .............
Answer» 10 to 25 rpm 100 to 250 rpm 1000 to 2500 rpm 10,000 to 25,000 rpm SOLUTION :100 to 250 rpm

Discussion

15287.	Question : In suspension culture, the culture constantly rotates over rotary shaker because ..............
Answer» Through this CELLS easily PROCESS aeration The content of the medium are THROUGHLY mixed CELL MASSES become differentiated and form small masses. All the above Solution :All the above

Discussion

15288.	Question : In ………. Superior males of one breed are mated with superior females of another breed.
Answer» out crossing cross BREEDING out breeding inbreeding Answer :B

Discussion

15289.	Question : In succulent plants the stomata open in night and close in day. Which among the following would be best hypothesis to explain the mechanism of stomatal action in night only ?
Answer» `CO_2` accumulates, REDUCES pH, stimulate enzymes resulting in accumulation of sugars. increse in `CO_2` concentration, conversion of orgaincacids into starch resulting in theincreased conversion into sugars resulting in K* transport low `CO_2`, concentration accumulates organic acids resulting in the increased concentration of cell sap. `CO_2` used up, increase pH. Results in accumalation of sugars. Solution :In CAM plants stomata open at night. In these plants night acidification occurs. i.e., malic acid is synthesised during night DUE to incemplete oxidation of carbohydrates `{:(2C_6H_12O_6+3O_2rarr3O_2rarr3C_4H_6O_5+3H_2O),("""( malic acid )"),(""darr),(""" leads to openingof stomata "):}` At night malic acid formed in guard cells dissociates into H' and malate ions. K ion EXCHANGE from subsidiary cells with H' ions. THUS due to accumulation of K' ions osmotic pressure of guard cells increases, endosmosis occurs and guard cells become turgid due to which stomata open. The malic acid at day time breaks into `CO_2`, and pyruvic acid thus increasing the concentration of `CO_2` in mesoplıyll cells. This is utilised in the Calvin cycle to FORM sugar which is finally converted into starch.

Discussion

15290.	Question : In sun plants the chloroplasts are arranged against vertical walls of palisade tissue, the arrangement is called_____.
Answer» ANSWER :parastrophe

Discussion

15291.	Question : In succulent plants like Opuntia,, the RQ value will be:
Answer» LESS than 1 More than 1 Infinity Zero Answer :D

Discussion

15292.	Question : In succession, complexities in structure:
Answer» DRASTICALLY increase slowly increase does not increase constant Answer :B

Discussion

15293.	Question : In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen ?(A) Oxygen(B) Carbon(C) Fe(D) CI
Answer» Oxygen Carbon Fe CI ANSWER :D

Discussion

15294.	Question : In stroma -
Answer» Enzymatic reactions incorporate `CO_(2)` into the plant leading to ATP and `NADH_(2)` formation. Enzymatic reactions incorporate `CO_(2)` into plant leading to the synthesis of sugar, which in TURN forms starch Light energy is captured to form glucose ATP and `NADPH_(2)` are splitted and `H_(2)`O and `O_(2)` RELEASED ANSWER :B

Discussion

15295.	Question : In STPs, how many stages are there for water purification ?(A) 2(B) 3(C) 4(D) 5
Answer» 2 3 4 5 Solution :3

Discussion

15296.	Question : In sterile couple, help can be done to produce a child through GIFT technique what is the full from of this method?
Answer» GAMETE semen DONATION FALLOPIAN transfer Gamete intra fallopian transfer Gamete INTERNAL FERTILIZATION transfer Germ shell internal fallopian transfer Answer :B

Discussion

15297.	Question : In stems, the primary xylem is called endarch, because -
Answer» The protoxylem is surrounded by the metaxylem Both the protoxylem and the metaxylem LIES TOWARDS the CENTRE The protoxylem lies towards the centre and the metaxylem lies towards the periphery The protoxylem lies towards the periphery and the metaxylem lies towards the centre Answer :C

Discussion

15298.	Question : In stems of dicots, vascular cambium arises from
Answer» Procambium Cambium Promeristem Protoderm Answer :A

Discussion

15299.	Question : In stem cuttings the adventitious roots develop from which tissue ?
Answer» ANSWER :. PERICYCLE

Discussion

15300.	Question :In split genes coding sequences are ____________
Answer» Introns Operons Exons Cistrons Answer :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : In the context of evolution, what is the most important source of new mutations?

Question : In the chart given below , 'AA, are the genes in a chromosome of Pisum sativum. Observe the chart and mention the genetic phenomenon does it indicates.

Question : In the cell mediated immuno response, T-lymphocytes divide and secrete

Question : In the cell mediated immuno response, T- lymphocytes divide and secrete

Question : In the cell cycle mitochondria and chloroplasts divide during ____

Question : In the case of the 'Swiss cheese' with large hole is due to the production of

Question : In the case of certain diseases like mumps, measles and chicken pox, the secondary immune response gives a life long immunity. Give the scientific reason behind this.

Question : In the C_4 - plants , C_4 cycle occurs in the mesophyll cells and C_3 - cycle occurs in bundle sheath cells, whereas in CAM plants .

Question : In the blind spot where the optic nerve leaves the eye :-

Question : In the beginning how was higher food production obtained by human beings?

Question :In the area of plant breeding, it is important not only to preserve the seeds of the variety being cultivated, but also to preserve all its wild relatives. Explain with a suitable example.

Question : In the area of plant breeding, it is important not only to preserve seeds of the variety being cultivated, but also to preserve all its wild relatives. Explain with suitable example.

Question : In the animal world, some organisms have both male and female repro-ductive organs. a. What do you call such organisms? b. Give two examples.

Question : In the angiosperm ovule central cell of the , embryo sac, prior to the entry of pollen tube, contains:

Question : In……. The adjacent stipules of two opposite leaves are fused

Question : In the ancient atmosphere, free nitrogen, exygen and carbon dioxide were not present because

Question : In the alveoli, dissociation of CO_(2) from carbamino haemoglobin occur, due to

Question : In the above given pedigree, assume that no outsider marrying in, carry a disease. Write the genotypes of II and III

Question : In the above diagram A & B represent respectively

Question : In the 1940s, Johannes van Overbeek stimulated growth in plant embryos with coconut milk. In the 1950s, Folke Skoog and Carlos O Miller stimulated cell division in tobacco plants with degraded DNA. The active ingredient in both stimulants, which was a modified

Question : In whom is testis found inside the abdomen.

Question : In the 18th century who suggested that modifications arise by the reaction of organism with the environment?

Question : In terms of changes in gene frequencies, founder events result in

Question : In testes,the newly formed sperms are temporarily stored in.....

Question : In terms of permeability, the cell wall and plasmalemma are :

Question : In telophase stage chromosomes decondense and lose their individuality.

Question : In term saltatory conduction, saltatory means running.

Question : In taxonomy the first step is :-

Question : In tailing, about ____________ adenylate residues are added at3'-end in a template independent manner on hnRNA

Question : In tall plants, because of which factor, continuous water coloum extends upwards ?

Question :In Taenia Self-fertilisation lakes place

Question : In synsndrous condition, three is fusion of

Question : In sycon , choanocytes from lining of

Question : In sweat pea, genes C and P are necessary for colour in flowers. The flowers are white in the absence of either or both the genes. What will be the percentage of coloured flowers in the offspring of the cross C c p p xx c c P p ?

Question : In suspension culture, the culture is constantly agitated to .............

Question : In suspension culture, the culture constantly rotates over rotary shaker because ..............

Question : In ………. Superior males of one breed are mated with superior females of another breed.

Question : In succulent plants the stomata open in night and close in day. Which among the following would be best hypothesis to explain the mechanism of stomatal action in night only ?

Question : In sun plants the chloroplasts are arranged against vertical walls of palisade tissue, the arrangement is called_____.

Question : In succulent plants like Opuntia,, the RQ value will be:

Question : In succession, complexities in structure:

Question : In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen ?(A) Oxygen(B) Carbon(C) Fe(D) CI

Question : In stroma -

Question : In STPs, how many stages are there for water purification ?(A) 2(B) 3(C) 4(D) 5

Question : In sterile couple, help can be done to produce a child through GIFT technique what is the full from of this method?

Question : In stems, the primary xylem is called endarch, because -

Question : In stems of dicots, vascular cambium arises from

Question : In stem cuttings the adventitious roots develop from which tissue ?

Question :In split genes coding sequences are ____________