24277 + Interview Questions in Biology in Class 12 Page 450 InterviewSolution

22451.	Question : Agglitinogens A andB are found in Platelets
Answer» BLOOD plasma Plasma MEMBRANE of RBCs Plasmamembrane of WBCs Answer :C

Discussion

22452.	Question : Agenda 21' is Related with :- (a) "The Earth summit" Held in Rio-de Janerio (b) The word summit on sustainabledevelopment (c) Biodiversity conservation (d) Conference on Human environment Stockholm
Answer» ANSWER :D

Discussion

22453.	Question : Age structure diagrams (A, B and C) for the populations are shown below. They represent:-
Answer» A-DECLINING POPULATIONS B- Stable POPULATION C- Growing population A-Growing population B- Stationary population C- Declining populations A-Exponential GROWTH B- Indeterminate growth C- Stationary population A-Growing population B- and C- Stable population Answer :D

Discussion

22454.	Question : Ageing of lakeis mainlycausedby theaccumulationof nutrientssuch as
Answer» <P>`N_2`&P `N_2`&P P&Ca Ca&`N_2` ANSWER :B

Discussion

22455.	Question : Age structure.
Answer» Solution :The relative of individuals of VARIOUS AGE group in the population is CALLED age structure of a population.

Discussion

22456.	Question : Age-sex sturcture of a population can be depicted in the form of a pyramid by plotting the percentage of population of each sex in each age class. Two age sex pyramids are given here. Study carefullythe above age-sex pyramids and select the correct statements regarding these.
Answer» A REPRESENTS the age-sex pyramid for a developed country and B represents the age-sex pyramid for a developing country. B is a MUCH less steep pyramid, representing a radpdly growing population, like that of india, as it has a much larger number of young people. A is a stepper pyramid, which represents a nearly stable population All of these Solution :Figures (A) and (B) show the age-sex PYRAMIDS for the developed and developing countries. A represents age-sex pyramid for a developed country which is a stepper pyramid showing nearly stable population with not much growth. B representsage-sex pyramid for a developing country, like india, which has RAPIDLY growing population. it is a much less steep pyramid, as it has a much larger number of young people.

Discussion

22457.	Question :Age pyramid of a stable population is
Answer» urn-shaped TRIANGULAR bell-shaped inverted Answer :C

Discussion

22458.	Question : Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms, includes
Answer» STUDY of carbohydrates/proteins in fossils study of the CONDITIONS of FOSSILIZATION electron spin RESONANCE (ESR) and fossil DN study of carbohydrates/proteins in rocks Solution : electron spin resonance (ESR) and fossil DN

Discussion

22459.	Question : 'Agarose GEL electrophoresis'' (I) Agarose gel Electrophoresis used mainly for the purification of specific DNA fragments . (II) Polyacrylamide is prefered for the purification of smaller DNA fragments . (III) Agarose is convenient for separating RNA fragments (IV) The gel is complex network of polymeric molecules .
Answer» I and II only I, II and III only I, II, III and IV I and IV only SOLUTION :N/A

Discussion

22460.	Question : Agarose is used as the matrix during gel electrophoresis. Why?
Answer» SOLUTION :The agarose forms a sieve-like structure through which the DNA fragments are MOVE FASTER as compared to bigger fragments, THEREFORE they are separated FIRST.

Discussion

22461.	Question : Agarose extracted from sea weeds finds use in
Answer» Spectrophotometry Tissue Culture PCR GEL electrophoresis SOLUTION :Gel electrophoresis

Discussion

22462.	Question : Agarose extracted from sea weeds finds use in :
Answer» Spectrophotometry Tissue culture Gel elecrophoresis PCR Answer :C

Discussion

22463.	Question : Agar is obtained from
Answer» Gracilaria Laminaria Gelidium Both (1) & (3) ANSWER :D

Discussion

22464.	Question : Agar agar is produced by
Answer» Algae Fungi BLUE GREEN algae Bacteria Answer :A

Discussion

22465.	Question : After thermal inversion, pollutants pile up in
Answer» HANGING COOL AIR Hanging warm air At the boundary of cool and warm airs Soil Answer :A

Discussion

22466.	Question : After the demise of the dinosaurs mammals evovlved rapidly into many new forms because of
Answer» the FOUNDER effect a GENETIC bottleneck adaptive RADIATION GEOLOGICAL time Answer :C

Discussion

22467.	Question : After the addition of the last amino acid to a growing polypeptide chain during the process of protein synthesis, one of the termination codons reaches the appropriate site on the ribosomal surface and then the following envents take place (i) Release of t-RNA molecule from the ribosome. (ii) Dislodging of polypeptide chain from the t-RNA (iii) Dissociation of ribosomes into large and small subunits. ltBrgt The correct sequence of these events:
Answer» (i),(II),(III) (iii),(ii),(i) (ii),(i),(iii) (iii),(i),(iii) ANSWER :B

Discussion

22468.	Question : After taking a long deep breath we do not respire for some second due to :
Answer» More `CO_2` in blood More `O_2` in blood Less `CO_2` in blood Less `O_2` in blood Answer :C

Discussion

22469.	Question : After taking a long breath, we can hold the breath as long as
Answer» `CO_2`in the BLOOD is more `H^+` in the blood is more `CO_2` in the blood is LESS `O_2`in the blood less ANSWER :C

Discussion

22470.	Question : After t he formation of products in the bioreactors, it undergoes through a series of processes before it is ready for marketing as a finished product, is called ?
Answer» UPSTREAM processing Dowsteram processing Elution Transformation Answer :B

Discussion

22471.	Question : After syngamy and triple fusion in embryo sac, embryo will be diploid and endosperm will be ____
Answer» SOLUTION :TRIPLOID

Discussion

22472.	Question : After syngamy and triple fusion in embryo sac, embryo will be diploid and endosperm will be _____
Answer» SOLUTION :TRIPLOID (3N)

Discussion

22473.	Question : After studying the female reproductive organs a student says that clitoris is a useless organ. How will you respond to this statement? Evaluate the statement and justify your answer.
Answer» SOLUTION :The CLITORIS is not a useless organ. It is a secondary SEXUAL organ and this is analogous to male penis.

Discussion

22474.	Question : After removal of signal peptide, the secretory protein involved in formationofinsuling is known as
Answer» Preinsulin Proinsulin Postinsulin Prepinsulin . SOLUTION :N//A

Discussion

22475.	Question : After reaching the cytoplasm the mRNA attaches itself to :
Answer» 40 S PARTICLE of ribosome 60 S particle of ribosome 70 S ribosome Endoplasmic reticulum Answer :A

Discussion

22476.	Question : After puberty human female shows cyclic changes in her reproductive system . Explain structural and hormonal changes in the uterus .
Answer» Solution :T.S. of Ovary : 2. Menstrual cycle. (1) Menstrual cycle starts withmenarcheand ends withmeno pause. It lasts forabout 28 days and is repeated throught this period with exception of duration of pregnancy. (2) There are series of changes in uterusand ovariesduring themensturalcycle andthese changes are regulatedby gonadotropinhormonesfrom pituitary and hormones of ovary. (3) Hormones, FSH, LH. estrogenand progesterone are respon-sible for these cyclic changes in mature females. (4) Menstrual cycle is dividedinto four phases , viz., menstrual phase, proliferative phase (in uterus)or follicularphase (in ovary),ovulatory phase,secretoryphase (in uterus)or luteal phase (in ovary). (1) Menstural phase : Menstrual phase 1st to 4th day in the absence of fertilization.During this phase bleeding occursas the endometrium of uterusis sloughed off. The thicknessof endometrium becomes 1 mm.After about 4th day of bleeding, once againthe FSH secretionfrom the pituitaryis resumedand the new follicle starts developing. (2)Follicular phase (in ovary)or Proliferativephase (inuterus) : (i) OVARIAN chanes : When the ovaryis in follicularphase, the uterusentersin proliferative phase.This takesplacefrom 5thto 13th day of the cycle. During this phase the new primordial follicle in theovary developsdue to theactionof FSHfrom pituitary. Primordial folliclegraduallychangesinto Graafian follicle, producingthe HORMONE estrogen.Only one follicledevelops in one cycle. (ii) Uterine changes : Theuterus also undergoes proliferation. The endometrial glands of uterusare stimulated and repairprocess of the uterustakes place under tehinfulence of estrogen.The thicnkessof endometrium growsto about 3 mm to 5 mm. (3) Ovulatory phase :Ovulation takes place, onthe 14 th day ofthe cycle. The matureGraffian follicle rupturesdue to LH secreted by the pituitary.The ovumis released in abdominal cavity. This ovum is pickedup by the fimbrineof infundibulum of fallopian tube. It passes throughthe fallopian tube. On its way if it happens to meet sperm, it is fertilized. If unfertilized , the ovumdegenerates. (4)Luteal phase (Ovary) or Secretory phase (Uterus) : Luteal phase in the ovarycorresponds with the secretoryphase in theuterus . It takes place between15th to 28th day of the cycle. (i) Ovarian changes : In the ovary thecourpus luteumis formed from the empty Graffianfollicle. The corpus luteum PRODUCES progestrone. If ovum is fertilizedthe corpuslutuemis retained. Hormones LH and LTH from pituitary help in the maintanceof corpus luteum. If the ovum is ot fertilized , the corpusluteum degenerates and formscorpusalbicans. (ii) Uterine changes : Under the INFLUENCE of progesterone, ther is increase in the thicnkess of endometrium. Endometrial glandsgrow and become secretory. Thehormone progesterone is responsiblefor the maintenance of pregnancy. If fertilized ovum reaches the uterus. If is implanted and placenta is formed. Thisleadsto pregnancyTill placenta becomes functionalthe corpus luteumkeeps on producing progesterone. If progesterone sourceis cut off, the endometrium sloughs off and themensturation begins, as in case of no conception.

Discussion

22477.	Question : Afterfertilization , the ovary and ovule develops into
Answer» PERICARP and furite furite and SEED furite and seed coat none of the above Answer :A

Discussion

22478.	Question : After parturition , till how many months the possibility of pregnancy is nil ?
Answer» 3 6 4 5 Answer :A

Discussion

22479.	Question : After ovulation the collapsed ovarian follicle shrinks and becomes filled with cell to form
Answer» CORPUS Leuteum corpus ALBICANS corpus ATRESIA corpus adiposum ANSWER :A

Discussion

22480.	Question : After injection the R-II bacteria and heat killed S-III bacteria into mices, what was observed ?
Answer» All mice are LIVE All mice are DIED DUE to pneumococcus injection Some mice are live, some are died. Mice are live with the pneumococcus injection. SOLUTION :All mice are died due to pneumococcus injection

Discussion

22481.	Question :After meiosis I, the resultant daughter cells have -
Answer» Same AMOUNT of DNA as in the PARENT cell in S - phase Twice the amount of DNA in COMPARISON to HAPLOID gamete Same amount of DNA in comparison to haploid gamete Four times the amount of DNA in comparison to haploid gamete ANSWER :A

Discussion

22482.	Question : After getting into the body of the person, the virus enters into ————-, simultaneously HIV enters into ————-
Answer» HELPER T-lymphocytes, MACROPHAGES KILLER T-lymphocytes, MONOCYTES macrophages, helper T-lymphocytes 1908 Answer :A

Discussion

22483.	Question : After fertilization, the_________ degenerates in embryo sac .
Answer» OVULE Polarnuclei ANTIPODALS Endosperm Answer :C

Discussion

22484.	Question : After fertilization in flowering plants seeds bearing embryos are found inside the fruits. If seeds are developed from ovules, what is the thick wall of the fruit that is protective in function called?
Answer» SOLUTION :PERICARP

Discussion

22485.	Question : After fertization in flowering plants seeds bearing embryos are found inside the fruits. If seeds are developed from ovules. Name the parts that give rise to embryo and fruits.
Answer» SOLUTION :ZYGOTE GIVES RISE to EMBRYO.

Discussion

22486.	Question : After ferilisation, the seed coats of seeds develop from(A) ovule(B) chalaza(C) integuments(D) nucellus
Answer» ovule chalaza integuments nucellus Answer :C

Discussion

22487.	Question : After fertilisation, vitelline membrane transforms into fertilisation membrane. Why?
Answer» Solution :The fertilisation MEMBRANE prevents the ENTRY of other sperm after fertilisation. HENCE it CHECKS polyspermy.

Discussion

22488.	Question : After double fertilization, most zygotes divide only after certain amount of endosperm is formed. One of the importance of this adaptation is
Answer» To PUSH the developing embryo out of the micropyle To prevent the developing zygote from being divided into many embryos To PROVIDE assured nutrition to the developing embryo To provide sufficient SPACE for developing embryo by DISSOLVING OUTER and inner integuments of ovule Answer :C

Discussion

22489.	Question : After double fertilization, a mature ovule has
Answer» (A) One DIPLOID and one HAPLOID CELL (B) One diploid and one triploid cell (C) TWO haploid and one triploid cell (D) One haploid and one triploid cell Answer :B

Discussion

22490.	Question : After digestion, chylomicrons from the small intestine are collected by the vessel
Answer» THORACIC DUCT RIGHT LYMPHATIC duct lactiferous duct right SUBCLAVIAN vein Answer :A

Discussion

22491.	Question : After analysisKaryotype of a short staturedround headed person with mental retardation a general physician noticed an addition of autosomal chromosomes. Answer the following: Suggest two more morphological peculiarities to confirm the chromosomes disorder in that person
Answer» Solution :SHORT stature, SMALL round head, partially OPENED mouth, FURROWED TOUNGE

Discussion

22492.	Question : After analysis the Karyotype of a short statured the karyotype of ashort statured round headed person with mental retardation a general physician noticed an addition of autosomal chromosomes. Answer the following: Addition or delection of chromosome generally results in ________.
Answer» SOLUTION :CHROMOSOMAL DISORDER

Discussion

22493.	Question : Afterkryotype analysis of a short statured round headed person with mental retardation a general physician noticed an addition of autosomal chromosomes. Answer the following: What may be the possible syndrome or disorder the above person is suspected to be ?
Answer» SOLUTION :Down.s SYNDROME

Discussion

22494.	Question : After a successful in vitro fertilisation, the fertilised egg begins to divide. Where is this egg transferred before it reaches the 8-cell stage and what is this technique named?
Answer» Solution :At uterus the egg is TRANSFERRED before it REACHES the 8 CELL STAGE and this technique is NAMED cleavage.

Discussion

22495.	Question : After a successful in vitro fertilization , the fertilized egg begins to divide. Where is this egg transferred before it reaches the 8-cell stage and what is this technique named ?
Answer» SOLUTION :FALLOPIAN tube, Zygote intra fallopian TRANSFER (ZIFT)

Discussion

22496.	Question :AFT
Answer» SOLUTION : AMNIOCENTESIS FERTILITY TEST

Discussion

22497.	Question : After a brief medical examination a healthy couple came to know that both of them are unable to produce functional gametes and should look for an' ART' (Assisted Re-productive Technique). Name the 'ART' and the procedure involved that you can suggest to them to help them bar a child.
Answer» Solution :That assisted REPRODUCTIVE technique (ART) for such couples is ZIFT, which stands for Z) gote intrafallopian transfer. In this technique. the sperm is collected from the donor male and the OVUM is collected from the donor female. The spern1 and the ovum are fused in laboratory conditions and developed until the 8-blastomere STAGE. This zygote or EARLY embryo is then transferred to the fallopian tube of the mother for further develop1nent. Q

Discussion

22498.	Question : After a cross of tall plant and dwarf plant,in F_1 generation ratio of tall : dwarf is 50 : 50. What are the genotypes of parents ?
Answer» TALL HETEROZYGOUS , DWARF homozygous Both homozygous Both heterozygous Dwarf heterozygous, tallhomozygous Answer :A

Discussion

22499.	Question : Affinity of CO for haemoglobin as compared to oxygen is :
Answer» TWO times 20 times 100 times 200 times Answer :D

Discussion

22500.	Question : Aestivationn found in Pea flowers is
Answer» TWISTED Valvate IMBRICATE Vexillary Answer :D

Discussion

Explore topic-wise InterviewSolutions in .

Question : Agglitinogens A andB are found in Platelets

Question : Agenda 21' is Related with :- (a) "The Earth summit" Held in Rio-de Janerio (b) The word summit on sustainabledevelopment (c) Biodiversity conservation (d) Conference on Human environment Stockholm

Question : Age structure diagrams (A, B and C) for the populations are shown below. They represent:-

Question : Ageing of lakeis mainlycausedby theaccumulationof nutrientssuch as

Question : Age structure.

Question : Age-sex sturcture of a population can be depicted in the form of a pyramid by plotting the percentage of population of each sex in each age class. Two age sex pyramids are given here. Study carefullythe above age-sex pyramids and select the correct statements regarding these.

Question :Age pyramid of a stable population is

Question : Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms, includes

Question : Agarose is used as the matrix during gel electrophoresis. Why?

Question : Agarose extracted from sea weeds finds use in

Question : Agarose extracted from sea weeds finds use in :

Question : Agar is obtained from

Question : Agar agar is produced by

Question : After thermal inversion, pollutants pile up in

Question : After the demise of the dinosaurs mammals evovlved rapidly into many new forms because of

Question : After taking a long deep breath we do not respire for some second due to :

Question : After taking a long breath, we can hold the breath as long as

Question : After t he formation of products in the bioreactors, it undergoes through a series of processes before it is ready for marketing as a finished product, is called ?

Question : After syngamy and triple fusion in embryo sac, embryo will be diploid and endosperm will be ____

Question : After syngamy and triple fusion in embryo sac, embryo will be diploid and endosperm will be _____

Question : After studying the female reproductive organs a student says that clitoris is a useless organ. How will you respond to this statement? Evaluate the statement and justify your answer.

Question : After removal of signal peptide, the secretory protein involved in formationofinsuling is known as

Question : After reaching the cytoplasm the mRNA attaches itself to :

Question : After puberty human female shows cyclic changes in her reproductive system . Explain structural and hormonal changes in the uterus .

Question : Afterfertilization , the ovary and ovule develops into

Question : After parturition , till how many months the possibility of pregnancy is nil ?

Question : After ovulation the collapsed ovarian follicle shrinks and becomes filled with cell to form

Question : After injection the R-II bacteria and heat killed S-III bacteria into mices, what was observed ?

Question :After meiosis I, the resultant daughter cells have -

Question : After getting into the body of the person, the virus enters into ————-, simultaneously HIV enters into ————-

Question : After fertilization, the_________ degenerates in embryo sac .

Question : After fertilization in flowering plants seeds bearing embryos are found inside the fruits. If seeds are developed from ovules, what is the thick wall of the fruit that is protective in function called?

Question : After fertization in flowering plants seeds bearing embryos are found inside the fruits. If seeds are developed from ovules. Name the parts that give rise to embryo and fruits.

Question : After ferilisation, the seed coats of seeds develop from(A) ovule(B) chalaza(C) integuments(D) nucellus

Question : After fertilisation, vitelline membrane transforms into fertilisation membrane. Why?

Question : After double fertilization, most zygotes divide only after certain amount of endosperm is formed. One of the importance of this adaptation is

Question : After double fertilization, a mature ovule has

Question : After digestion, chylomicrons from the small intestine are collected by the vessel

Question : After analysisKaryotype of a short staturedround headed person with mental retardation a general physician noticed an addition of autosomal chromosomes. Answer the following: Suggest two more morphological peculiarities to confirm the chromosomes disorder in that person

Question : After analysis the Karyotype of a short statured the karyotype of ashort statured round headed person with mental retardation a general physician noticed an addition of autosomal chromosomes. Answer the following: Addition or delection of chromosome generally results in ________.

Question : Afterkryotype analysis of a short statured round headed person with mental retardation a general physician noticed an addition of autosomal chromosomes. Answer the following: What may be the possible syndrome or disorder the above person is suspected to be ?

Question : After a successful in vitro fertilisation, the fertilised egg begins to divide. Where is this egg transferred before it reaches the 8-cell stage and what is this technique named?

Question : After a successful in vitro fertilization , the fertilized egg begins to divide. Where is this egg transferred before it reaches the 8-cell stage and what is this technique named ?

Question :AFT

Question : After a brief medical examination a healthy couple came to know that both of them are unable to produce functional gametes and should look for an' ART' (Assisted Re-productive Technique). Name the 'ART' and the procedure involved that you can suggest to them to help them bar a child.

Question : After a cross of tall plant and dwarf plant,in F_1 generation ratio of tall : dwarf is 50 : 50. What are the genotypes of parents ?

Question : Affinity of CO for haemoglobin as compared to oxygen is :

Question : Aestivationn found in Pea flowers is