24277 + Interview Questions in Biology in Class 12 Page 417 InterviewSolution

20801.	Question : At what stage of life is oogenesis initiated in a human female? When does the oocyte complete oogenesis?
Answer» Solution :After the puberty stage of LIFE oogenesis is initiated in human female. When OOCYTE changes into Graafian FOLLICLE, the PROCESS of oogenesis is complete.

Discussion

20802.	Question : At what stage is mammalian embryo implanted in the uterus?
Answer» SOLUTION :BLASTOCYST STAGE

Discussion

20803.	Question : At what stage of development are the gametes formed in new born male and female?
Answer» Solution :In males, at puberty the spermatogonia (sperm mother cells) begin to undergo meionc division and produces sperms through out life, whereas in females during the stage of foetal development, the germinal EPITHELIAL cells undergo MITOSIS and produce OOGONIA (egg mother cells) and they further enter prophase-I of meiosis-I forming primary oocytes and get arrested. No more oogonia is formed further. At puberty, out of MILLION eggs (prime oocytes) produced at birth only 300-400 will ovulate TILL menopause.

Discussion

20804.	Question : At what stage is the embryo implanted in the uterus of the mother in case of test tube baby
Answer» ANSWER :At 32 CELLED STAGE

Discussion

20805.	Question : At what stage, does the gene expression is regulated?
Answer» SOLUTION :GENE EXPRESSION can be CONTROLLED or regulated at transcriptional or translational levals.

Discussion

20806.	Question : At what speed, the mitochondria can be separated out by differential centrifugation?
Answer» `200xxg` `500xxg` `800xxg` `8000xxg` ANSWER :D

Discussion

20807.	Question :At what speed, the rotary shaker is rotated in suspension culture ?
Answer» 100-150 RPM 100-200 rpm 100-250 rpm 150-250rpm SOLUTION :100-250 rpm

Discussion

20808.	Question : At what intervals jhuming can be harmful to forests?
Answer» SOLUTION :LESS than 10 YEARS.

Discussion

20809.	Question : At what phase of meiosis are there two cells, each with separatedsister chromatids that have been moved to opposite spindle poles ?
Answer» Anaphase -I Anaphase -II Metaphase-I Metaphase_II Solution :During anaphase-II of meiosis -II The centromeres DIVIDE and the daughter chromosomes move TOWARDS the spindle POLES.

Discussion

20810.	Question : At what age menstruation starts in girls ?
Answer» ANSWER :12 to 13 YEAR

Discussion

20811.	Question : At toxic levels of concentration of mineral element, the dry weight of tissue reduces by about
Answer» HALF 0.05 0.1 0.01 Answer :C

Discussion

20812.	Question : At the time of puberty how many primary follicle left in each ovary :-
Answer» 60,000 – 80,000 7 million 10,000 – 20,000 1,20,000 – 1,60,000 Answer :A

Discussion

20813.	Question : At the time, the ligaments are overstretched or torn this is called______.
Answer» ANSWER :SPRAIN

Discussion

20814.	Question : At the new place, a person suddenly starts sneezing and wheezing. The statements CORRECTLY correlate this condition (i) This is an exaggerated response of the immune system. (ii) Symptoms are watery eyes and running nose. (iii) Due to the release of chemicals like adrenaline, steroids and histamine. (iv) Antibodies produced to these are IgE type.
Answer» i,ii,iii,iv are true i,iii,iv are true i,ii,iv are true All are CORRECT except iv ANSWER :C

Discussion

20815.	Question : At _________, the number of individuals added equals the number of individuals lost.
Answer» SOLUTION :ZERO GROWTH RATE

Discussion

20816.	Question : At the end of first meiotic division, male germ cell diffentiates into
Answer» Secodnary SPERMATOCYTE PRIMARY spermatocyte to SECONDARY spermatocyte Spermatogonium Spermatid. ANSWER :A

Discussion

20817.	Question : At the bottom of ponds decomposers found are
Answer» FUNGI BACTERIA FLAGELLATES All of these SOLUTION :All of these

Discussion

20818.	Question : At the beginning of the twentieth century, what part of land was covered by forest in India ?(A) 10%(B) 20%(C) 30%(D) 40%
Answer» `10%` `20%` `30%` `40%` Answer :C

Discussion

20819.	Question : At symptome stage, the population is
Answer» STABILISED INCREASING DECREASING CHANGING ANSWER :A

Discussion

20820.	Question : At puberty total number of primary follicles in each ovary of human female is about
Answer» 80000 600000 160000 1600000 Answer :A

Discussion

20821.	Question : At rest, the eyes have
Answer» RELAXED cililary body Contracted CILIARY body Suspensory LIGAMENT is LOOSE or relaxed Eye lens is elastic and biconvex. Answer :A

Discussion

20822.	Question : At resting stage, nerve cell has
Answer» Low `K^+` outside and HIGH Na+ inside High` K^+`inside and high `Na + ' outside High`K^+` inside and low `Na^+ `outside High`K^+` outside and low `K^+`inside Answer :B

Discussion

20823.	Question : At neuromuscular junction, a released by b binds to its receptors present on cthus generating action potential in latter.Choose the option which gives the correct answer for the blanks in the statement given above.
Answer» a - GLYCINE, C- dendrites b-Axon TERMINALS, c- Sarcolemma a- Acetylcholine, b- MYOCYTES b - Myocytes, a - Axon terminals Answer :B

Discussion

20824.	Question : At present there are how many wild life Sanctuaries in India ?
Answer» 492 417 316 294 Solution :492

Discussion

20825.	Question : At present about How many recombinant therapeutics have been approved for human use the world over :-
Answer» 12 30 27 40 Answer :B

Discussion

20826.	Question : At present there are how many biosphere reserves in India ?
Answer» FOUR TWELVE TEN FOURTEEN Solution :Fourteen

Discussion

20827.	Question : At metaphase chromosomes are attached to the spindle fibres by their:
Answer» Satellites Secondary constricion Kinetochores Centromeres Answer :C

Discussion

20828.	Question : At menopause ,there is rise in urinary excretion of harmone _____
Answer» ANSWER :FSH

Discussion

20829.	Question : At menopause, there is rise in urinary excretion of
Answer» FSH STH LH MSH Answer :A

Discussion

20830.	Question : At higher light intensities the rate of photosynthesis decreases because of -
Answer» other FACTORS BECOMING LIMITING destruction/photoxidation of chlorophyll carotenoids are killed Both a and B Answer :B

Discussion

20831.	Question : At higher altitudes body overcome altitude sickness by increasing
Answer» BINDING CAPACITY of HAEMOGLOBIN with O2 RBCs production Breathing rate Both (2) and (3) ANSWER :D

Discussion

20832.	Question : At equilibrium which chamber will have lower water potential ?
Answer» Answer :At EQUILIBRIUM the two CHAMBERS will have the same WATER potential.

Discussion

20833.	Question : At equilibrium in a thistle funnel experiment
Answer» No MOVEMENT of WATER across the EGG membrane TAKE place No net movement of water across the membrane take place No movement of solute across the egg membrane 2 and 3 Answer :D

Discussion

20834.	Question : At equilibrium in thistle funnel experiment
Answer» Free energy is maximum Water potential gradient is zero Solution in beaker and in thistle FUNNEL are isotonic 1 and 2 Answer :B

Discussion

20835.	Question : At atmospheric pressure a solution has Psi_S = –10, what is the value of water potential for this solution?
Answer» Can't be calculated without `Psi_P` WATER potential = -10 Water potential of solution at atmospheric pressure ALWAYS taken to be zero Water potential = 10 Answer :B

Discussion

20836.	Question : At do below 4 mg/l, water at normal temperature is
Answer» HEAVILY POLLUTED MODERATELY polluted LITTLE polluted NEARLY pure. Answer :A

Discussion

20837.	Question : At asymptote stage, the population is
Answer» STABILISED Increasing Decreasing Changing Solution :At ASYMPTOTE STAGE, the POPULATION is stablised.

Discussion

20838.	Question : At a particular locus, frequency of allete A is 0.6 and that of allele a is 0.4. what would be the frequency of heterozygotes in a random mating population at equilibrium?
Answer» 0.36 0.16 0.24 0.48 Solution :In a STABLE population, for a GENE with two alleles, 'A' (dominant) and 'a'(RECESSIVE), if the frequency of 'A'is P and the frequency of 'a' is q, then the frequencies of the three possible genotypes (AA,Aa and aa) can be expressed by the Hardy-Weinberg equation: `p^(2)+2pq+q^(2)=1` where `p^(2)=` FREQEUNCY of A A (HOMOZYGOUS dominant) Inviduals `q^(2)=` Frequency of Aa (heterozygous) individuals. so, p=0.6 and q=0.4 (given) `therefore 2pq` (frequency of heterozygote) `=2xx0.6xx0.4=0.48`.

Discussion

20839.	Question : At a particular locus, frequency of allele A is0.6 and that of allele 'a' is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?
Answer» 0.36 0.16 0.24 0.48 Answer :D

Discussion

20840.	Question : At a rural health care centre, a nursing mother is given an immunisation schedule for BCG and DPT to be given to the baby. What are the diseases, the child will be protected against?
Answer» SOLUTION :TUBERCULOSIS, DIPHTHERIA, PERTUSSIS, TETANUS

Discussion

20841.	Question : Asymptote is a stage when a population is
Answer» STABILISED changing increasing decreasing Answer :A

Discussion

20842.	Question : Asymptote is the stage when a population is
Answer» STABILIZED CHANGING INCREASING decreasing Answer :A

Discussion

20843.	Question : Asymptote in a logistic growth curve is obtained when
Answer» K=N `K GT N` `K lt N` The value of 'R' APPROACHES zero Answer :A

Discussion

20844.	Question : Asymmetric shape of spindle is observed during
Answer» POLLEN mitosis Microsporogenesis MEGASPOROGENESIS ENDOSPERM development Answer :1

Discussion

20845.	Question : Asymptote in a logistic growth curve is obtained, when
Answer» The value of ‘r’ APPROACHES ZERO K = N K GT N K lt N Answer :B

Discussion

20846.	Question : Assuming sexual reproduction with random mating, no Gene flow and no selection what will be the frequency of yellow snails in the next generation of the population described above (Q99)?
Answer» 0.2 0.3 0.45 0.55 Answer :A

Discussion

20847.	Question : Assume that you are trying to insert a gene into a plasmid and someone gives you a preparation of DNA cut with restriction enzyme X. The gene tou wish to insert has sites on both ends for cutting by restriction enzyme Y. You have a plasmid with a single site for Y, but not for X. Your strategy should be to
Answer» Cut the plasmid with RESTRICTION enzyme X and INERT the fragments cut with Y into the plasmid Cut the plasmid with restriction enzyme X and insert the gene into the plasmid Cut the plasmid TWICE with restriction enzyme Y and ligate the TWO fragments into the plasmid cut with the same enzyme Cut the plasmid twice with restriction enzyme Y and ligate the two fragments ONTO the ends of the human DNA fragments cut with restriction enzyme X Answer :C

Discussion

20848.	Question : Assume that their are 8 types of nitrogen bases are available and 500 types of amino acid are available for protein synthesis, then in genetic code each codon made up by minimum how many nitrogen base :
Answer» 3 4 5 2 Answer :A

Discussion

20849.	Question : Assume that one molecule of glucose entered in aerobic respiration. Glycolysis, link reaction, Krebs cycle and ETS sequentially occurred. But intermediate compounds of Krebs cycle that is alpha- ketoglutaric acid is withdrawn for the formation of glutamic acid. Then how many net ATPs are obtained in this aerobic respiration?
Answer» 18 12 4 20 Answer :A

Discussion

20850.	Question : Assume that genes a and b are linked and show 40 % reombination. If ++/++ individual is crossed with ab/ab, then tpes and proportions of gametes in F_(1) will be
Answer» `++20%:ab20:+20%:a+40%` `++50%:ab50%` `++25%:ab25%:+b25%:a+25%` `++30%:AB30%:+b20%:a+20%` Answer :D

Discussion

Explore topic-wise InterviewSolutions in .

Question : At what stage of life is oogenesis initiated in a human female? When does the oocyte complete oogenesis?

Question : At what stage is mammalian embryo implanted in the uterus?

Question : At what stage of development are the gametes formed in new born male and female?

Question : At what stage is the embryo implanted in the uterus of the mother in case of test tube baby

Question : At what stage, does the gene expression is regulated?

Question : At what speed, the mitochondria can be separated out by differential centrifugation?

Question :At what speed, the rotary shaker is rotated in suspension culture ?

Question : At what intervals jhuming can be harmful to forests?

Question : At what phase of meiosis are there two cells, each with separatedsister chromatids that have been moved to opposite spindle poles ?

Question : At what age menstruation starts in girls ?

Question : At toxic levels of concentration of mineral element, the dry weight of tissue reduces by about

Question : At the time of puberty how many primary follicle left in each ovary :-

Question : At the time, the ligaments are overstretched or torn this is called______.

Question : At _________, the number of individuals added equals the number of individuals lost.

Question : At the end of first meiotic division, male germ cell diffentiates into

Question : At the bottom of ponds decomposers found are

Question : At the beginning of the twentieth century, what part of land was covered by forest in India ?(A) 10%(B) 20%(C) 30%(D) 40%

Question : At symptome stage, the population is

Question : At puberty total number of primary follicles in each ovary of human female is about

Question : At rest, the eyes have

Question : At resting stage, nerve cell has

Question : At neuromuscular junction, a released by b binds to its receptors present on cthus generating action potential in latter.Choose the option which gives the correct answer for the blanks in the statement given above.

Question : At present there are how many wild life Sanctuaries in India ?

Question : At present about How many recombinant therapeutics have been approved for human use the world over :-

Question : At present there are how many biosphere reserves in India ?

Question : At metaphase chromosomes are attached to the spindle fibres by their:

Question : At menopause ,there is rise in urinary excretion of harmone _____

Question : At menopause, there is rise in urinary excretion of

Question : At higher light intensities the rate of photosynthesis decreases because of -

Question : At higher altitudes body overcome altitude sickness by increasing

Question : At equilibrium which chamber will have lower water potential ?

Question : At equilibrium in a thistle funnel experiment

Question : At equilibrium in thistle funnel experiment

Question : At atmospheric pressure a solution has Psi_S = –10, what is the value of water potential for this solution?

Question : At do below 4 mg/l, water at normal temperature is

Question : At asymptote stage, the population is

Question : At a particular locus, frequency of allete A is 0.6 and that of allele a is 0.4. what would be the frequency of heterozygotes in a random mating population at equilibrium?

Question : At a particular locus, frequency of allele A is0.6 and that of allele 'a' is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?

Question : At a rural health care centre, a nursing mother is given an immunisation schedule for BCG and DPT to be given to the baby. What are the diseases, the child will be protected against?

Question : Asymptote is a stage when a population is

Question : Asymptote is the stage when a population is

Question : Asymptote in a logistic growth curve is obtained when

Question : Asymmetric shape of spindle is observed during

Question : Asymptote in a logistic growth curve is obtained, when

Question : Assuming sexual reproduction with random mating, no Gene flow and no selection what will be the frequency of yellow snails in the next generation of the population described above (Q99)?

Question : Assume that their are 8 types of nitrogen bases are available and 500 types of amino acid are available for protein synthesis, then in genetic code each codon made up by minimum how many nitrogen base :

Question : Assume that genes a and b are linked and show 40 % reombination. If ++/++ individual is crossed with ab/ab, then tpes and proportions of gametes in F_(1) will be