24277 + Interview Questions in Biology in Class 12 Page 260 InterviewSolution

12951.	Question : mendel succeeded in his experiments because:
Answer» He SELECTED pea plants Independent CHARACTERS were studied A LOT of charcters were selected Pea plant is bisexual Answer :B

Discussion

12952.	Question : Mendel showed that units of heredity,the factors or genes are stable and particulate.
Answer» ANSWER :1

Discussion

12953.	Question : Mendel observed two kinds of ratios 3:1 and 1: 2:1 in F_2generations in his experiments on garden pea. Name these two kinds of ratios respectively.
Answer» SOLUTION :PHENOTYPIC RATIO, GENOTYPIC ratio.

Discussion

12954.	Question : Mendel published his work on inheritance of characters in 1865, but it remained unrecognised till 1900 due to the reason (s) (A) Communication was not easy in those days. (B) His contemporaries did not accept factors as discrete units of heredity. (C) Mathematical approach to explain inheritance was totally new. (D) Mendel could not provide any physical proof for the existence of factors
Answer» Only A and B are correct Only B and C are correct Only C and D are correct All are correct. Answer :D

Discussion

12955.	Question : Mendel proposed two rules based on his obsevation on monohybrid cross. What are they ?
Answer» SOLUTION :The rules are called LAWS of inheritance. The first law is ''The Law of Dominance'' and the SECOND law is '' The Law of Segregation''.

Discussion

12956.	Question : Mendel failed to obtain the same results on
Answer» Hawkweed Lablab Cucurbita pepo Both (1)&(2) ANSWER :D

Discussion

12957.	Question : Mendel experiments had a large sampling size.
Answer» ANSWER :TRUE

Discussion

12958.	Question : Mendel called the fundamental physical unit of heredity as
Answer» Gene Unit factor Cistron Operon Answer :B

Discussion

12959.	Question : Memory cells are
Answer» CELLS responsible for immunologic MEMORY Antigens PRODUCING cells Cells responsible for memory in brain Cells of CEREBRUM for balance Answer :A

Discussion

12960.	Question : Membranes of ER and other cell organelles interconnected to form a system known as ____.
Answer» ANSWER :CYTOPLASMIC vacuolar SYSTEM

Discussion

12961.	Question : Membraneless cell organelle is ,
Answer» Nucleus Lysosome Peroxisome Ribosome Answer :D

Discussion

12962.	Question : Membrane separating air in pulmonary alveoli from blood capillaries :
Answer» ALVEOLAR epithelium Cardiac epithelium Endothelium BLOOD capillaries Both a and c Answer :D

Discussion

12963.	Question : Membrane potential of a cell forms
Answer» MOVEMENT of ANIONS into the cell Movement of CATIONS into the cell Action of PROTON pumb Action of an electrotgenic pumb Answer :B

Discussion

12964.	Question : Membrane permeability is controlled by
Answer» `NA^(+)` `K^(+)` Both A and B `Ca^(2+)` SOLUTION :N//A

Discussion

12965.	Question : Membrane bound receptors and hormones produce second messengers like ……….. .
Answer» RENIN `IP_(3)` ANF GHRF Answer :B

Discussion

12966.	Question : Membrane bound organelles are absent in which type of cells?
Answer» ANSWER :PROKARYOTIC

Discussion

12967.	Question : Membrane bound minute vesicles that contain various enzymes, present in both plants and animals are called
Answer» Vacuoles Macrobodies MICROBODIES CENTROSOMES ANSWER :C

Discussion

12968.	Question : Members of myxomycetes
Answer» Shows LINKAGE with plants, animals and fungi Possesses photosynthetic pigments Produce spores with CELLULOSIC wall Both (1) and (3) ANSWER :D

Discussion

12969.	Question : Members of group chrysophytes :-
Answer» are found only in fresh water are the CHIEF producers in the oceans are MICROSCOPIC and float ACTIVELY in water current are only parasitic Answer :B

Discussion

12970.	Question : Members of a biological species are potentially able to :
Answer» EXPRESS all the same genes Indrogress Compete Interbreed Answer :D

Discussion

12971.	Question : Melvin Calvin conducted two sets of experiments, In first set the Chlorella was fed withCO_(2)^(14) for 3 seconds and in the second set for 60 seconds. The radioactivity of C^(14) was found to be present in -
Answer» 1-C of PGA in both the EXPOSURE 3-C of PGA in both the exposure The RADIOACTIVITY of SHORT-exposure in 1-C and long exposure in 3-C of PGA The radioactivity of long exposure in 1-C and of short exposure in 3-C of PGA Answer :C

Discussion

12972.	Question : Meloidegyne incognitia is a nematode parasite infects the roots of tobacco plants. It'sinfection can be prevented by biotechnological methods. Explain the principle behind this strategy.
Answer» Solution :Nematode SPECIFIC genes were introduced into the host plant through the Agrobacterium vector. This introduced specific genes PRODUCES both sense and antisense RNA in the host CELLS. These TWO RNA.s being complementary to each other formedds RNA. This ds RNA SILENCES the specific mRNA of the nematode.

Discussion

12973.	Question : Meloidegyne incognitia is a nematode parasite infects the roots of tobacco plants. It'sinfection can be prevented by biotechnological methods. Name the strategy.
Answer» SOLUTION :RNA I (RNA INTERFERENCE)

Discussion

12974.	Question : Melatonin hormone stimulates the proliferation of lymphocytes inhancing immunity(Thymasin).
Answer» ANSWER :THYMOSINE HORMONE STIMULATES the proliferation of lymphocytes inhancing immunity(Thymasin).

Discussion

12975.	Question : Melanurea (black urine) is caused by abnormal catabolism of
Answer» Alanine Tyrosine Proline Tryptophan Answer :B

Discussion

12976.	Question : Meiosis which occur at the time of spore formation is called:-
Answer» ZYGOTIC meiosis Haplontic meiosis Terminal meiosis Intermediate meiosis Answer :D

Discussion

12977.	Question : Meiotic division during oogenesis is different from that in spermatogenesis. Explain how and why?
Answer» Solution : It makes ovum larger than the remaining three polar bodies by unequal mitotic DIVISION because there are many organelles and cytoplasm in ovum. It has many chances for rescue. Male produces sperms in lakhs of amount while FEMALE produces only one ovum in each month and it waits for TIME before fertilisation for second meiotic division. Sperm is SMALL and motile because it has to move from male REPRODUCTIVE system to female reproductive system. There is abundant stored food in large ovum so it develops immediately after fertilisation.

Discussion

12978.	Question : Meiosis takes place in:
Answer» CONIDIA Gemmule Megaspore Meiocyte Answer :D

Discussion

12979.	Question : Meiosis occurs in the zygotes of
Answer» Bryophytes Pteridophytes Gymnosperms Haploid algae Answer :C

Discussion

12980.	Question : Meiosis occur in
Answer» MEGASPORE MEIOCYTE CONIDIA Gemmule Answer :B

Discussion

12981.	Question : Meiosis is also known as:
Answer» EQUATIONAL DIVISION Reductional division Direct CELL division All of these Answer :B

Discussion

12982.	Question : Meiosis is a type of cell division where the chromosomal number is reduced to half the number in daughter cells. Which type of cell division occurs in the drones to produces sperm?
Answer» Solution :The gonadal cells of drones UNDERGO mitosis to from sperms. Because the drones are haploid in nature SINCE they develop from unfertilized eggs. To AVOID further reduction in chromosome no. and maintain the chromosomal constancy, (instead of undergoing meiosis), mitosis will TAKE place leading to FORMATION of haploid gametes.

Discussion

12983.	Question : Meiosis involves ___ nuclear division but __ chromosomal division.
Answer» ONE,one One,two two, one two, two Answer :C

Discussion

12984.	Question : Meiosis ensures the product of haploid phase I the life cycle of sexually reproduction oranisms.
Answer» ANSWER :1

Discussion

12985.	Question : Meiosis - I is completed before coming out of oocyte from ovary and form?
Answer» SECONDARY oocyte Second polarbody First POLAR body Both 1 & 3 Answer :D

Discussion

12986.	Question : Meiosis during sperm formation of Ascaris, was first observed by
Answer» Fleming Boveri Brauer De Vries Answer :C

Discussion

12987.	Question : Explain why meiosis and gametogenesis are always interlinked ?
Answer» Solution :Gametogenesis is a process of formation of male and female gametes. The gametes of all the organisms are haploid, i.e., possess single set of CHROMOSOMES. These gametes are FORMED as a RESULT of meiosis. This meiosis reduces the number of chromosome to half in the gamete hence meiosis and gametogenesis is INTERLINKED.

Discussion

12988.	Question : Megathermic organisms are found in
Answer» TROPICAL zones Sub-tropical zone Temperate zone Arctic zone Answer :A

Discussion

12989.	Question : Megasporogenesis
Answer» Occurs in sporogenous TISSUE of anther Forms gametos WITHOUT meiosis Involves reductional division Is not OBSERVED in ANGIOSPERMS Solution :Chara is green alga which has multicellular and jacketed sex organs Most species of chara are monoecious globule and nucule are male and FEMALE sex organs of chara respectively

Discussion

12990.	Question : Megaspores and microspores garminate to give rise to - and- respectively.
Answer» FEMALE and MALE sporophytes male and female sporophytes female and male gametophytes male and female gametophytes Answer :C

Discussion

12991.	Question : Megasporangium is equal to what(A) Embryo sac(B) Fruit(C) Nucellus(D) Ovule
Answer» EMBRYO sac Fruit Nucellus Ovule Answer :D

Discussion

12992.	Question :Megaspores are produced from megaspore mother cells after
Answer» FORMATION of THICK walls Differentiation Meiotic division Mitotic division Answer :C

Discussion

12993.	Question : Megasporangium, Nucellus, Megaspores, Megaspore mother cells
Answer» SOLUTION :Megaspores, Megaspores are haploid, others are diploids in the STRUCTURE of OVULE

Discussion

12994.	Question : Megaspore arises from ……….. .
Answer» Integument Nucellus Placenta Raphe Answer :C

Discussion

12995.	Question :Megasporangium is equivalent to
Answer» FRUIT NUCELLUS OVULE EMBRYO sac Answer :C

Discussion

12996.	Question : Megakaryocytes
Answer» Produce leucocytes Form BLOOD platelets Are called bone cells Are CARRIERS of oxygen Answer :B

Discussion

12997.	Question : Meena, an environmental activist, noticed a gradual declinein the population of birds in the open agricultural fields near her place. She has heard of the excessive use of pesticides like DDT around that area.
Answer» Solution :Calcium metabolism of birds is distrubed due to the ACCUMULATION of DDT. This CAUSES premature BREAKING of eggs. So bird population eventually declines.

Discussion

12998.	Question : Medullary vascular bundles commonly occur in the members of family
Answer» BRASSICACEAE MALVACEAE Amaranthaceae CUCURBITACEAE ANSWER :C

Discussion

12999.	Question : Medullary rays present in vascular stem bundle of
Answer» SUNFLOWER STEM Canna stem Asparayus stem Triticum stem Answer :A

Discussion

13000.	Question : Medullary nephrons are
Answer» WITHOUT Henle loop without VASA recta with LONG Henle loop with less blood supply Answer :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : mendel succeeded in his experiments because:

Question : Mendel showed that units of heredity,the factors or genes are stable and particulate.

Question : Mendel observed two kinds of ratios 3:1 and 1: 2:1 in F_2generations in his experiments on garden pea. Name these two kinds of ratios respectively.

Question : Mendel proposed two rules based on his obsevation on monohybrid cross. What are they ?

Question : Mendel failed to obtain the same results on

Question : Mendel experiments had a large sampling size.

Question : Mendel called the fundamental physical unit of heredity as

Question : Memory cells are

Question : Membranes of ER and other cell organelles interconnected to form a system known as ____.

Question : Membraneless cell organelle is ,

Question : Membrane separating air in pulmonary alveoli from blood capillaries :

Question : Membrane potential of a cell forms

Question : Membrane permeability is controlled by

Question : Membrane bound receptors and hormones produce second messengers like ……….. .

Question : Membrane bound organelles are absent in which type of cells?

Question : Membrane bound minute vesicles that contain various enzymes, present in both plants and animals are called

Question : Members of myxomycetes

Question : Members of group chrysophytes :-

Question : Members of a biological species are potentially able to :

Question : Melvin Calvin conducted two sets of experiments, In first set the Chlorella was fed withCO_(2)^(14) for 3 seconds and in the second set for 60 seconds. The radioactivity of C^(14) was found to be present in -

Question : Meloidegyne incognitia is a nematode parasite infects the roots of tobacco plants. It'sinfection can be prevented by biotechnological methods. Explain the principle behind this strategy.

Question : Meloidegyne incognitia is a nematode parasite infects the roots of tobacco plants. It'sinfection can be prevented by biotechnological methods. Name the strategy.

Question : Melatonin hormone stimulates the proliferation of lymphocytes inhancing immunity(Thymasin).

Question : Melanurea (black urine) is caused by abnormal catabolism of

Question : Meiosis which occur at the time of spore formation is called:-

Question : Meiotic division during oogenesis is different from that in spermatogenesis. Explain how and why?

Question : Meiosis takes place in:

Question : Meiosis occurs in the zygotes of

Question : Meiosis occur in

Question : Meiosis is also known as:

Question : Meiosis is a type of cell division where the chromosomal number is reduced to half the number in daughter cells. Which type of cell division occurs in the drones to produces sperm?

Question : Meiosis involves ___ nuclear division but __ chromosomal division.

Question : Meiosis ensures the product of haploid phase I the life cycle of sexually reproduction oranisms.

Question : Meiosis - I is completed before coming out of oocyte from ovary and form?

Question : Meiosis during sperm formation of Ascaris, was first observed by

Question : Explain why meiosis and gametogenesis are always interlinked ?

Question : Megathermic organisms are found in

Question : Megasporogenesis

Question : Megaspores and microspores garminate to give rise to - and- respectively.

Question : Megasporangium is equal to what(A) Embryo sac(B) Fruit(C) Nucellus(D) Ovule

Question :Megaspores are produced from megaspore mother cells after

Question : Megasporangium, Nucellus, Megaspores, Megaspore mother cells

Question : Megaspore arises from ……….. .

Question :Megasporangium is equivalent to

Question : Megakaryocytes

Question : Meena, an environmental activist, noticed a gradual declinein the population of birds in the open agricultural fields near her place. She has heard of the excessive use of pesticides like DDT around that area.

Question : Medullary vascular bundles commonly occur in the members of family

Question : Medullary rays present in vascular stem bundle of

Question : Medullary nephrons are

Question : Meiosis involves _ nuclear division but chromosomal division.