24277 + Interview Questions in Biology in Class 12 Page 468 InterviewSolution

23351.	Question : A medical technician while observing a human blood smear under the microscope note the presence of a Barr body close to the nuclear membrane in the WBC. This indicates that the person under investigation is a
Answer» COLOUR blind hemophilic NORMAL FEMALE normal male Solution :normal female

Discussion

23352.	Question : A measure of the frequency of crossing -over between two linked chromosome marker loci in recombining meiotic product is called :
Answer» MAP DISTANCE Loop distance CHROMOSOMAL aberration Chromosome distance Answer :A

Discussion

23353.	Question : A mature woman has ………….. Linkage groups.
Answer» 44 22 46 23 Answer :D

Discussion

23354.	Question : A mature spermatozoa is ... mum is diameter.
Answer» `10-15` `15-20` `2-5` `0,1-1` ANSWER :C

Discussion

23355.	Question : A mature male gametophyte is formed from pollen mother cell by :
Answer» ONE MEIOTIC division TWO meiotic divisions One metiotic and two MITOTIC divisions Three meiotic divisions Answer :C

Discussion

23356.	Question : A mature female gametophyte (embryo sac/egg apparatus) of angiosperms is 7 celled with 8 nucleus. Name the individual cells and mention their count.
Answer» Solution :`{:("(a) Egg ", -1),("(b) SECONDARY nucleus",-1),("(C) SYNERGIDS ",-2),("(d) Antipodalcells",-3):}`

Discussion

23357.	Question : A mature angiospermic embryo sac is …………………… .
Answer» 8 CELLED and 8 NUCLEATED 7 celled and 8 nucleated 8 celled and 7 nucleated 7 celled and 8 nucleated Answer :B

Discussion

23358.	Question : A mass of white matter that connects two cerebral hemisphere of the mammalian brain is
Answer» Pons Mamrilillary Corpus callosum Cruracerebri ANSWER :C

Discussion

23359.	Question : A marriage between normal visiond man and colour blind woman will produce which of the following types of off-springs ?
Answer» ANSWER :B

Discussion

23360.	Question : A marriage between a colourblind man and a normal woman produces
Answer» All CARRIER DAUGHTERS and NORMAL SONS 50% carrier daughters, 50% normal daughters 50% colourblind sons, 50% normal sons All carrier offsprings Answer :A

Discussion

23361.	Question : A marked increase in stem length is by:
Answer» GA IAA Florigen Vernalin Answer :A

Discussion

23362.	Question : A marine cartilaginous fish that can produce electric current is-
Answer» (a) PRISTIS (B) TORPEDO (C) TRYGON (d) Scoliodon Answer :B

Discussion

23363.	Question : [A]: Man's most characteristic feature in which it differs from all its primate relatives is his large brain and high intelligence.[R]: A lumbar curve is absent in man which is present in apes
Answer» If both A and R are true and R is the CORRECT EXPLANATION of A If both A and R are true but R is not the correct explanation of A If A is true and R is FALSE If both A and R are false ANSWER :C

Discussion

23364.	Question : A man with genotype EEFfGgHH produces 'P' number of different sperms. A woman with genotype IiLLMmNn can form 'Q' types of ova. What is correct about 'P' and 'Q'
Answer» P-4,Q-4 P-4,Q-8 P-8,Q-4 P-8,Q-8 Answer :B

Discussion

23365.	Question : A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?
Answer» A and B A, B and AB A, B, AB and O Only O Answer :C

Discussion

23366.	Question : A man whose father was colour blind marries a woman, who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind ?
Answer» 0.25 0 0.5 0.75 Solution :0.25

Discussion

23367.	Question : A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind?
Answer» 0.25 0 0.5 0.75 Answer :C

Discussion

23368.	Question : A man -made microecosystem is :
Answer» PLANTS grown in a POND CROP field Tank formed naturally in yourcourtyard Lake in a forest Answer :B

Discussion

23369.	Question : A man made ecosystem is
Answer» Less in DIVERSITY More in diversity Man does not make ecosystem More stable than NATURAL ecosystem Solution :Less in diversity

Discussion

23370.	Question : A man made allopolyploid cereal crop is
Answer» Hordeum vulgare Triticale Raphanobrassica Zea mays Answer :C

Discussion

23371.	Question : A man has a genetic condition which is inherited by both his daughter and son. Gene of this condiiton is present on
Answer» X-chromosome Y-chromosome Autosome Mitochondrial genome Solution :Starch synthesizing GENE in PEA which also regulates the size of seed, show incomplete dominance Polygenic inheritance - Kernel colour of WHEAT Multiple allelism - ABO blood GROUP in human PLEIOTROPY - Phenylketonuria

Discussion

23372.	Question : A man has enlarged breasts, sparse hair on body and sex complement as XXY. He then suffers from
Answer» down.s SYNDROME Klinefelter's syndrome edward.s syndrome turner.s syndrome Solution :Klinefelter.s syndrome

Discussion

23373.	Question : A man & women who both appear normal have a child together, who has sickle cell anaemia. The woman becomes pregnant again and is told that she is carrying fraternal (dizygotic) twins. What is the probability that both of the couple's twins will have Sickle Cell Anaemia :-
Answer» `(1)/(16)` `(1)/(4)` `(1)/(2)` `(9)/(16)` ANSWER :A

Discussion

23374.	Question : A mammal with a voice similar to crackling human laughter is
Answer» JACKAL Hyaena Fox PANDA. ANSWER :B

Discussion

23375.	Question : A man can inherit his X chromosome from
Answer» his MATERNAL GRANDMOTHER or maternal GRANDFATHER. his father his maternal grandfather only his PATERNAL grandfather Answer :A

Discussion

23376.	Question :A male of couple has least number of sperms . Then which method is proper in them for fertilization ?
Answer» Inter uterine transfer Gamete intra cytoplasmic fallopain TUBE transfer Artificial SEMEN DONATION Intra cytoplasmic sperm INJECTION ANSWER :C

Discussion

23377.	Question : A male human is heterozygous for autosomal genes A and B .Heis also hemizyous for hameophilic gene H h. what prolportion of sperms will carry abg
Answer» `1//8` `1//32` `1//4` `1//16` ANSWER :A

Discussion

23378.	Question : A male human is heterozygous for autosomal genes A and B. He is also hemizygous for haemophilic gene h. What proportion of sperms will carry abh?
Answer» `1//8` `1//32` `1//4` `1//16` ANSWER :A

Discussion

23379.	Question : A male human is heterozygous for autosomal genes A and B and is also hemizygous for haemophilic gene h.What proportion of this sperms will be abh ?
Answer» `1//4` `1//8` `1//16` `1//32` ANSWER :B

Discussion

23380.	Question : A major side effect of continental drift was
Answer» Fossilization and EVOLUTIONARY radiation Climatic change and EXTINCTION of many species Climatic change and micro evolution Mass extinction due to reduction in the AMOUNT of ATMOSPHERIC oxygen Answer :B

Discussion

23381.	Question :A major function of surfactantis to
Answer» Decrease alveolar surface tension INCREASE alveolar SUFACE tension Increase the work of BREATING Increase the TENDENCY of the lungs to collapse Answer :A

Discussion

23382.	Question : Which of the following is a main component of biogas ?
Answer» Ammonia METHANE Ethane Butane SOLUTION :Methane

Discussion

23383.	Question : [A]: Macro evolution produces groups of par- allel special adaptations among convergent but related species.[R]: Adaptive radiation/macroevolution don't produce evolutionary lines that converge in special adaptation with other related groups differing in general adaptation
Answer» If both A and R are true and R is the CORRECT explanation of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false ANSWER :D

Discussion

23384.	Question : A maize plant has 20 chromosomes in its leaf cells. What would be the number of chromosomespresent in its synergids and cells of aleurone layer, respectively ?
Answer» 10,30 20,30 30,20 20,10 Solution :From father, daughter receive X-chromosome while son receives Y-chromosome. If the character of a father is INHERITED by both daughter and son , then the gene of that character should be present on any of the autosome of MALE PARENT. Male gemete does not contribute to the MITOCHONDRIAL DNA pool of the zygote / progeny

Discussion

23385.	Question : A low level of expression of lac operon occurs at all the time. Can you explain the logic behind this phenomena.
Answer» Solution :In the complete absence of EXPRESSION of lac operon, permease will not be synthesised which is essential for TRANSPORT of lactose from medium into the cells. And if lactose cannot be transported into the cell, then it cannot ACT as INDUCERS, hence cannot relieve the lac operon from its repressed STATE.

Discussion

23386.	Question : A low level of expression of lac operon occurs at all the time. Can you explain the logic behind this phenomenon?
Answer» Solution :In the complete absence of expression of lac OPERON, permease will not be SYNTHESISED which is ESSENTIAL for transport of lactose from medium into the CELLS. And if lactose cannot be transported into the cell, then it cannot act as inducers hence, cannot RELIEVE the lac operon from its repressed state. During translation, if the codon on mRNA is AUG, then

Discussion

23387.	Question : A low level of expression of lac operon occurs at all the time in E-coli. Justify the statement.
Answer» SOLUTION :One of the enzyme synthesized by LAC operon is PERMEASE which is involved in the transport of lactose into the CELLS. If the lac operon gets inactivated, permease is not synthesized hence lactose cannot ENTER the cell. Lactose acts as a inducer, binding to the repressor protein and switch on the operator to initiate gene expression.

Discussion

23388.	Question : A long term adaptation of having both dissected and undissected leaves occur in anaquatic plant which is
Answer» LIMNOPHILA SAGITTARIA EICHHORNIA Azolla Answer :A

Discussion

23389.	Question : [A] : lnsulin is not given orally.[R]: Insulin is a macromolecule and is not absorbed by the mucosa layer.
Answer» If both A and R are true and R is the CORRECT explanation of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false ANSWER :C

Discussion

23390.	Question : A location with luxuriant growth of lichens on the trees indicates that the :
Answer» TREES are very HEALTHY trees are HEAVILY infested location is HIGHLY polluted location is not polluted Answer :D

Discussion

23391.	Question : [A]: lnterspecific mating often produces a more vigorous but sterile F_1 hybrids.[R]: Reproductive isolation does not let evolu- tion to occur.
Answer» If both A and R are true and R is the CORRECT explanation of A If both A and R are true but R is not the correct explanation of A If A is true and R is false If both A and R are false ANSWER :C

Discussion

23392.	Question : A localised tumour covered by connective tissue is called
Answer» metastasis malignant tumour benign tumour neoplasm Answer :C

Discussion

23393.	Question : A list of some hormones is given in the box.[ Insulin. Cortisol. Testosterone, Thyroxine. Epinephrine. TSH. FSH. Progesterone, GnRH ]How many among themulles mentioned above will act via membrane bound receptors and intracellular receptors respectively?
Answer» 5, 4 4, 5 6, 3 3, 6 Answer :A

Discussion

23394.	Question : A list of organisms are given. Place them in different trophic levels. Grass, man, fishes,birds, lion, grasshopper, zooplankton, trees.
Answer» SOLUTION :1st trophic level - GRASS, trees 2nd trophic level - Grasshopper, zooplankton 3rd trophic level - Birds, FISHES 4th trophic level - Lion, MAN

Discussion

23395.	Question : A list of Biosphere reserves are given below:What are the Hot spots? Name any two hot spots in India
Answer» Solution :BIODIVERSITY rich AREAS with threatened species. E.g., Western Ghats and Srilanka, Himalaya.

Discussion

23396.	Question : A list of different organisms in an ecosystem are given below. Arrange them in 1st, 2nd, 3rd, and 4th trophic level. A - Phytoplankton B - man C - fish D - Zooplankton
Answer» SOLUTION :

Discussion

23397.	Question : A list of Biosphere reserves are given below: What is recorded in "Red data book"?
Answer» SOLUTION :List of VULNERABLE, endangered and CRITICALLY endangered SPECIES.

Discussion

23398.	Question : (a) List any three ways of measuring population density of a habitat. (b) Mention the essential information that can be obtained by studying the population density of an organism.
Answer» Solution :(a) Three WAYS of measuring population density of a habitat are : (i) By PHYSICAL COUNTING. (ii) By percent cover or total biomass. (iii) Counting pug MARKS and counting faecal pellets. (b) (i) The status of habitat. (ii) Whether competition for survival exists or not. (iii) Whether population is increasing or declining.

Discussion

23399.	Question : A list of Biosphere reserves are given below:Identify the biosphere reserves in Kerala and write a note on the importance of biosphere reserves.
Answer» SOLUTION :Agasthyamala. CONSERVATION and ECONOMIC DEVELOPMENT

Discussion

23400.	Question : A lineisdrawnfromtheexteriorof ananimalcellto thecentreof the nucleus, crossingthroughonemitochondrion . Whatis theminimumof membrane bilayers thatthelinewill cross ?
Answer» 4 3 8 6 Solution :Therechouldbe fivemembranebilyer thatline will CROSS 1.Cellmembrane 2.Mitochdrial membrane 2. NUCLEUS

Discussion

Explore topic-wise InterviewSolutions in .

Question : A medical technician while observing a human blood smear under the microscope note the presence of a Barr body close to the nuclear membrane in the WBC. This indicates that the person under investigation is a

Question : A measure of the frequency of crossing -over between two linked chromosome marker loci in recombining meiotic product is called :

Question : A mature woman has ………….. Linkage groups.

Question : A mature spermatozoa is ... mum is diameter.

Question : A mature male gametophyte is formed from pollen mother cell by :

Question : A mature female gametophyte (embryo sac/egg apparatus) of angiosperms is 7 celled with 8 nucleus. Name the individual cells and mention their count.

Question : A mature angiospermic embryo sac is …………………… .

Question : A mass of white matter that connects two cerebral hemisphere of the mammalian brain is

Question : A marriage between normal visiond man and colour blind woman will produce which of the following types of off-springs ?

Question : A marriage between a colourblind man and a normal woman produces

Question : A marked increase in stem length is by:

Question : A marine cartilaginous fish that can produce electric current is-

Question : [A]: Man's most characteristic feature in which it differs from all its primate relatives is his large brain and high intelligence.[R]: A lumbar curve is absent in man which is present in apes

Question : A man with genotype EEFfGgHH produces 'P' number of different sperms. A woman with genotype IiLLMmNn can form 'Q' types of ova. What is correct about 'P' and 'Q'

Question : A man with blood group 'A' marries a woman with blood group 'B'. What are all the possible blood groups of their offsprings?

Question : A man whose father was colour blind marries a woman, who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind ?

Question : A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind?

Question : A man -made microecosystem is :

Question : A man made ecosystem is

Question : A man made allopolyploid cereal crop is

Question : A man has a genetic condition which is inherited by both his daughter and son. Gene of this condiiton is present on

Question : A man has enlarged breasts, sparse hair on body and sex complement as XXY. He then suffers from

Question : A man & women who both appear normal have a child together, who has sickle cell anaemia. The woman becomes pregnant again and is told that she is carrying fraternal (dizygotic) twins. What is the probability that both of the couple's twins will have Sickle Cell Anaemia :-

Question : A mammal with a voice similar to crackling human laughter is

Question : A man can inherit his X chromosome from

Question :A male of couple has least number of sperms . Then which method is proper in them for fertilization ?

Question : A male human is heterozygous for autosomal genes A and B .Heis also hemizyous for hameophilic gene H h. what prolportion of sperms will carry abg

Question : A male human is heterozygous for autosomal genes A and B. He is also hemizygous for haemophilic gene h. What proportion of sperms will carry abh?

Question : A male human is heterozygous for autosomal genes A and B and is also hemizygous for haemophilic gene h.What proportion of this sperms will be abh ?

Question : A major side effect of continental drift was

Question :A major function of surfactantis to

Question : Which of the following is a main component of biogas ?

Question : [A]: Macro evolution produces groups of par- allel special adaptations among convergent but related species.[R]: Adaptive radiation/macroevolution don't produce evolutionary lines that converge in special adaptation with other related groups differing in general adaptation

Question : A maize plant has 20 chromosomes in its leaf cells. What would be the number of chromosomespresent in its synergids and cells of aleurone layer, respectively ?

Question : A low level of expression of lac operon occurs at all the time. Can you explain the logic behind this phenomena.

Question : A low level of expression of lac operon occurs at all the time. Can you explain the logic behind this phenomenon?

Question : A low level of expression of lac operon occurs at all the time in E-coli. Justify the statement.

Question : A long term adaptation of having both dissected and undissected leaves occur in anaquatic plant which is

Question : [A] : lnsulin is not given orally.[R]: Insulin is a macromolecule and is not absorbed by the mucosa layer.

Question : A location with luxuriant growth of lichens on the trees indicates that the :

Question : [A]: lnterspecific mating often produces a more vigorous but sterile F_1 hybrids.[R]: Reproductive isolation does not let evolu- tion to occur.

Question : A localised tumour covered by connective tissue is called

Question : A list of some hormones is given in the box.[ Insulin. Cortisol. Testosterone, Thyroxine. Epinephrine. TSH. FSH. Progesterone, GnRH ]How many among themulles mentioned above will act via membrane bound receptors and intracellular receptors respectively?

Question : A list of organisms are given. Place them in different trophic levels. Grass, man, fishes,birds, lion, grasshopper, zooplankton, trees.

Question : A list of Biosphere reserves are given below:What are the Hot spots? Name any two hot spots in India

Question : A list of different organisms in an ecosystem are given below. Arrange them in 1st, 2nd, 3rd, and 4th trophic level. A - Phytoplankton B - man C - fish D - Zooplankton

Question : A list of Biosphere reserves are given below: What is recorded in "Red data book"?

Question : (a) List any three ways of measuring population density of a habitat. (b) Mention the essential information that can be obtained by studying the population density of an organism.

Question : A list of Biosphere reserves are given below:Identify the biosphere reserves in Kerala and write a note on the importance of biosphere reserves.

Question : A lineisdrawnfromtheexteriorof ananimalcellto thecentreof the nucleus, crossingthroughonemitochondrion . Whatis theminimumof membrane bilayers thatthelinewill cross ?