24277 + Interview Questions in Biology in Class 12 Page 331 InterviewSolution

16501.	Question : HIV that causes AIDS, first starts destroying
Answer» B-lymphocytes LEUCOCYTES HELPER T-lymphocytes Thrombocytes SOLUTION :Helper T-lymphocytes

Discussion

16502.	Question : HIV is not spread by
Answer» Sexual CONTACT with infected persons By TRANSFUSION of contaminated blood and blood products Infected mother to her child through placenta Sharing BEDSHEETS, TOWELS and combs with infected person Answer :D

Discussion

16503.	Question : HIV that cause AIDS , first starts destroying :
Answer» B-lymphocytes Leucocytes Thrombocytes Helper-T-lymphocytes Answer :D

Discussion

16504.	Question : HIV is a member of group of viruses called :
Answer» Bacteriophages Gemini VIRUSES Lysogenic viruses RETRO viruses Answer :D

Discussion

16505.	Question : HIV is a retrovirus. Give reason.
Answer» Solution :Because it can synthesise DNA from RNA by a process KNOWN as reversetranscription with the help of an ENZYME known as reverse TRANSCRIPTASE,

Discussion

16506.	Question : HIV has a protein coat and a genetic material which is:
Answer» SINGLE STRANDED DNA Single stranded RNA Double stranded DNA Double stranded DNA Answer :B

Discussion

16507.	Question :HIV Antigen
Answer» Solution :Location : In BLOOD of a PATIENT having DISEASE AIDS. FUNCTION : The disease can be cured by finding its antibody.

Discussion

16508.	Question : HIV.
Answer» Solution :(1)HIV means human immunodeficiency Virus.It causes AIDS.(2)It is a retrovirus that is CAPABLE of bringing about reverse transcription(3)It infects `CD_(4)` Lymphocytes and thereby brings about loss in cell-mediated immunity.Due to which the BODY becomes progressively more susceptible to opportunistic INFECTIONS.(4)The virus has glycoprotien and LIPID coverings.there is single stranded RNA molecule which is surrounded by outer and inner protien coats.The RNA brings about reverse transcription as it has an ENZYME reverse transcriptase.

Discussion

16509.	Question :HIV
Answer» SOLUTION :HUMAN IMMUNO DEFICIENCY VIRUS

Discussion

16510.	Question : Historyof modern man goes back to
Answer» 20000 years 10000 years 1 LAKH years none of these ANSWER :A

Discussion

16511.	Question : Histones are rich in
Answer» ALANINE and glycine Lysine and ARGININE HISTIDINE Cysteine and tyrosine Answer :B

Discussion

16512.	Question : Histone proteins are
Answer» basic , negatively charged basic , positively charged acidic, positively charged acidic, negatively charged. Solution :(B) : In eukaryotes, DNA organisation is complex. There is a set of positively CHANGED, basic porteins called histones. Histones are rich in the basic aminoacid RESIDUES lysine and arginine. There are five types of histone proteins-`H_(1),H_(2)A,H_(2)B, H_(3) and H_(4)`. Four of them`(H_(2)A, H_(2)B, H_(3) and H_(4))` produce histone octamer called nu body or core of nucleosome . The negatively charged DNA is wrapped around the positively charged histone octamer to form nucleosome. DNA connecting two adjacent nucleosomes is called linker DNA which BEARS `H_(1)` histone proteins.

Discussion

16513.	Question : Histological structure of testis.
Answer» Solution :(1)The EXTERNAL COVERING of testies is a fibrous connective tissue called tunica albuginea.(2)Then there is an incomplete peritoneal covering called tunica vaginalis.(3)Interior to this there is a covering called tunica cascularis formed by capillaries.(4)The testis is composed of many seminiferous tubules that are lined by CUBOIDAL germinal epithelial cells.(5)In the seminiferous tubules various stages of developing sperms are seen as spermatogenesis takes PLACE here.These stages are spermatogonia,primary and secondary spermatocytes,spermatids and sperms.(6)Large,pyramidal subtentacular cells,nurse cells or sertoli cells are present between germinal epithelium,Sperm bundles remain attached to sertoli cell with their heads.(7)Seminiferous tubules form sperms wheres sertoli cells provide nourishment to the sperms till maturation. (8)In between seminiferous tubules there are interstiltial cells of leyding which are endocrine in nature.They secrete testosterone.

Discussion

16514.	Question : Histamines' the inflammation producing substance are produced by which cells of the body ?
Answer» COLLAGEN fibres Macrophages MAST CELLS Sustentacular cells Answer :C

Discussion

16515.	Question : Histamine is secreted by
Answer» MAST cell Histiocytes Lymphocytes Fibrocytes Answer :A

Discussion

16516.	Question : Hissardale is a breed of sheep developed by________
Answer» SOLUTION :INBREEDING

Discussion

16517.	Question : Hisardale is the supirior breed of sheep developed by
Answer» CROSS BREEDING GENETIC engineering somatic HYBRIDIZATION inbreeding Answer :A

Discussion

16518.	Question : Hisardale is a new breed of sheep developed in punjab through
Answer» out crossing outbreeding crossing breeding interspecific HYBRIDISATION ANSWER :B::C::D

Discussion

16519.	Question : Hisardale is a
Answer» GOOD quality apple produced in punjab Good quality sheep in Assam Good quality HORSE developed in punjab by crossing mariino EWES and Bikaneri ewes New bread of sheep develped in punjabby crossing MARINO rams and Bikaneri ewes Answer :D

Discussion

16520.	Question : Hisardale a new breed of sheep developed in Punjab by crossing Bikaneri ewes and Merino rams is an example of
Answer» Outcrossing Cross-breeding Interspecific hybridisation Outbreeding Answer :B

Discussion

16521.	Question : Hirudin is:
Answer» A protein produced by Hordeum vulgare, which is rich in lysine A toxic molecule isolated from Gossypium hirsutum, which reduces HUMAN fertility A protein produced from TRANSGENIC Brassica napus, which prevents blood clotting An antibiotic produced by a GENETICALLY engineered BACTERIUM, Escherichia coli. Answer :C

Discussion

16522.	Question : Which one is a fish?
Answer» Fish Horse Elephant Dog Answer :A

Discussion

16523.	Question : Hirudin is
Answer» a protein produced by Hordeum vulgare, which is rich in lysine a toxic molecule isolated from Gossypium hirsutum, which reduces humn fertility a protein produced from transgenic Brassica napus which PREVENTS blood clotting an antibiotic produced by a genetically engineered bacterium Escherichia coli Solution :Hirudin is a protein that STOPS blood clotting. The gene encoding hirudin was chemically SYNTHESISED. This gene was then transsferred into Brassica napus, where hirudin accumulates in seeds. The hirudin is PURIFIED and used as medicine.

Discussion

16524.	Question : HIND-II recognises a specific sequence of how many base pairs ?
Answer» 3 10 6 8 Solution :6

Discussion

16525.	Question : Himgiri and Pusa Sadabahar are resistant toiandiirespectively.
Answer» (1) LEAF CURL, (ii) WHITE rusi (i) White rust, (ii) hill burnt (i) Black rot, (ii) BACTERIAL blight (i) Leaf and stripe rust, (ii) chilly mosaic virus Answer :D

Discussion

16526.	Question : .Himgiri. developed by hybridisation and selection for disease resistance against rust pathogens is a variety of
Answer» WHEAT Chilli Maize Sugarcane SOLUTION :Wheat

Discussion

16527.	Question : Himgiri developed by hybridisation and selection for disease resistance against rust pathogens is a varity of
Answer» Chilli Maize Sugarcane Wheat Answer :D

Discussion

16528.	Question : Hilton's muscle is
Answer» ARYEPIGLOTTIC MUSCLE Quadriceps muscle Gracillis muscle Trapezius muscle. Answer :A

Discussion

16529.	Question : Hill reaction occurs in
Answer» High ALTITUDE plants TOTAL DARKNESS ABSENCE of WATER Presence of ferricyanide Answer :D

Discussion

16530.	Question : Highlight the milestones from the history of plant embryology. Milestones in Plant Embryology.
Answer» SOLUTION :1682 - Nehemiah Grew mentioned stamens as the male orgen of a flower. 1694 - R.J Camerarius descrined the structure of a flower, anther , pollen and ovule 1761 - J.G Kolreuter gave a detrailed accound on the importance of insects in pollination 1824 - G.B . AMICI discovered the pollen tube. 1848 - Hofmeister described the structure of pollen tetrad. 1870 - Hansteim described the development of embryo in Capsella and Alisma. 1878 - E. Strasbuger reported POLYEMBRYONY. 1884 - Hofmeister described the sturcture of pollen tetrad. 1870 - Hanstein described the development of embryo in Capsella and Alisma. 1878 - E. Strasburger reported polyembryony. 1884 - E. Stasburger discovered rhe process of Syngamy. 1899 - S.G. Nawschin and L. Guignard independently discovered Double fertilization . 1904- E. Hanning initiated embryo culture. 1950 - D.A Johansen proposed clssification for embryo development. 1964 - S. Guha and S.C Maheswari raised haploids from Datura pollen grains . 1991 - E.S Coen and E.M . Meyerowitz proposed the ABC model to describle the genetics and initiation and development of floral parts. K.V Krishanmurthy summarized the molecular aspects of pre and POST fertilization reporductive in flowering plants.

Discussion

16531.	Question :Highlight any four areas where genetic modification of plants has been useful.
Answer» Solution : Genetically modified plants have been developed with a focus on following improved CHARACTERISTICS: (a) INCREASED tolerance to abiotic stresses like low or high temperature, drought or salinity. (b) Resistance to pests, herbicides, and microbial infections. (c) Reduced post harvesting losses. (d) Better nutritional value. (e) Increased efficiency in mineral utilisation. (F) Medicinal or PHARMACEUTICAL or commercial value.

Discussion

16532.	Question : Highlight five areas where biotechnology has influenced our lives.
Answer» Solution :The applications of biotechnology include: (i) Therapeutics and DIAGNOSTICS (ii) genetically modified crops for agriculture (iii) processed food (IV) bioremediation (v) waste treatment and ENERGY production.

Discussion

16533.	Question : Highlight any four areas where genetic modification of plants has been useful.
Answer» Solution :Plants, bacteria, fungi and animals whose genes have been altered by manipulation are called GENETICALLY MODIFIED ORGANISMS (GMO). GM plants have been useful in many ways. Genetic modification has (i) Made crops more tolerant to abiotic stresses (cold, drought, salt, heat). (ii) Reduced reliance on chemical pesticides (pest-resistant crops). (iii) Helped to reduce post harvest losses. (iv) INCREASED efficiency of mineral usage by plants (this prevents early (exhaustion of fertility of soil). (v) Enhanced nutritional value of food e.g VITAMIN "A" enriched rice.

Discussion

16534.	Question : Highest cranial capacity is found in:
Answer» Homo SAPIENS NEANDERTHAL man Peking man Cro MAGNON man Answer :D

Discussion

16535.	Question : Highest cranial capacity has been in
Answer» Peking Man Java Man Modern Man Handy Man. Solution :BIOGENESIS. The term was COINED by T.H. Huxley (1870) for LIFE BEGETS life.

Discussion

16536.	Question : Higher respiratory quotient is in which among the following?
Answer» Fats PROTEIN CARBOHYDRATES Organic ACIDS Answer :D

Discussion

16537.	Question : Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?
Answer» Solution :Because of variations, gene POOL, vigour and vitality and parental care.

Discussion

16538.	Question : Higher organisms have resorted to sexual reproduction in spite of their complexity. Why ?
Answer» Solution :Higher organisms have RESORTED to SEXUAL reproduction in spite of their complexity because sexual reproduction INDUCES genetic variability or adaptations which make the offspring BETTER EQUIPPED for the struggle of existence.

Discussion

16539.	Question : Higher BOD could lower the DO.a) Do you agree with the statement b)Give reason
Answer» SOLUTION :a)yes B)HIGHER BODlower DOD CONTENT of waterD.O .is the dissolved.O_2. content of water .Whenorganiccontentis increaesdin watertheD.O. is consumedfor itsoxidation by bacteriawhich is

Discussion

16540.	Question : Higher organisms have resorted to sexual reproduction in spite of its complexity, Why?
Answer» Solution :Because of (i) SEXUAL reproduction BRINGS variations which help to bear changes on the environment. (II) It helps in the evolution of species. (iii) Variation occurs due to crossing over during gametogenesis and random fusion of GAMETES during fertilization.

Discussion

16541.	Question : Higherconcentrationof DDT is foundin thirdtrophiclevel than firsttrophic level a) Name the phenomenonassociatedwiththe accumulation of DDTb) Bird populationis decreasedbythe accumulationof DDT How is it occurs ?
Answer» SOLUTION :a)BIOMAGNIFICATION B) DDTaffectsthe calciummetabolismof BIRDS ,causesthe thinningof eggshelland prematurebreakingthat it resultthe reductionin birdpopulation

Discussion

16542.	Question : High osmolarity of inner medullary interstitium is mainly caused by -
Answer» NACL and water NaCl and urea Water and Glucose Water and Urea Answer :B

Discussion

16543.	Question : High DDT pollutionin waterbodies caused declinein bird population . Evaluate .
Answer» Solution :HIGH concentrationof DDT distrubs calcium metabolsim in birds, whichcauses thiningof EGG SHELL and theirprematurebreaking EVENTUALLY causedeclinein bird popluations.

Discussion

16544.	Question : High dose of which of the following can cause snow blindness?
Answer» IR UV X-RAYS Gamma rays ANSWER :B

Discussion

16545.	Question : High content of carboxyhemoglobin in blood isassociated with
Answer» SMOKING ALCOHOLISM Opiates Radiation therapy Answer :A

Discussion

16546.	Question : High CO_2 compensation point is found in
Answer» `C_3` - PLANTS `C_4` - plants CAM plants Algae Answer :A

Discussion

16547.	Question : hich one is appropriate pair ?
Answer» Cultivation of Honeybee - Sericulture Outbreeding - Mule Interspecific hybridization - SANTA gertudese EXPLANT - SELECTED plant ORGAN Solution :Explant - Selected plant organ

Discussion

16548.	Question : Hiccups can be best described as
Answer» forceful SUDDEN expiration forceful CONTRACTION of intercostal MUSCLES during deep breathing vibration of soft palate during breathing while sleeping jerky incomplete inspiration Answer :D

Discussion

16549.	Question : hGH extractedformdeadhumanmayresultintogenticdiseaseknownas
Answer» SEVERE combinedimmuno deficiencydisease pituitarydwarfism creutzfeldtjacob cysticfibrosis ANSWER :C

Discussion

16550.	Question : Hiccough (hiccup) is due to activity of:
Answer» lntercostal muscles Food in AIR TRACT Diaphragm Inadequate OXYGEN in the environment Answer :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : HIV that causes AIDS, first starts destroying

Question : HIV is not spread by

Question : HIV that cause AIDS , first starts destroying :

Question : HIV is a member of group of viruses called :

Question : HIV is a retrovirus. Give reason.

Question : HIV has a protein coat and a genetic material which is:

Question :HIV Antigen

Question : HIV.

Question :HIV

Question : Historyof modern man goes back to

Question : Histones are rich in

Question : Histone proteins are

Question : Histological structure of testis.

Question : Histamines' the inflammation producing substance are produced by which cells of the body ?

Question : Histamine is secreted by

Question : Hissardale is a breed of sheep developed by________

Question : Hisardale is the supirior breed of sheep developed by

Question : Hisardale is a new breed of sheep developed in punjab through

Question : Hisardale is a

Question : Hisardale a new breed of sheep developed in Punjab by crossing Bikaneri ewes and Merino rams is an example of

Question : Hirudin is:

Question : Which one is a fish?

Question : Hirudin is

Question : HIND-II recognises a specific sequence of how many base pairs ?

Question : Himgiri and Pusa Sadabahar are resistant toiandiirespectively.

Question : .Himgiri. developed by hybridisation and selection for disease resistance against rust pathogens is a variety of

Question : Himgiri developed by hybridisation and selection for disease resistance against rust pathogens is a varity of

Question : Hilton's muscle is

Question : Hill reaction occurs in

Question : Highlight the milestones from the history of plant embryology. Milestones in Plant Embryology.

Question :Highlight any four areas where genetic modification of plants has been useful.

Question : Highlight five areas where biotechnology has influenced our lives.

Question : Highlight any four areas where genetic modification of plants has been useful.

Question : Highest cranial capacity is found in:

Question : Highest cranial capacity has been in

Question : Higher respiratory quotient is in which among the following?

Question : Higher organisms have resorted to sexual reproduction in spite of its complexity. Why?

Question : Higher organisms have resorted to sexual reproduction in spite of their complexity. Why ?

Question : Higher BOD could lower the DO.a) Do you agree with the statement b)Give reason

Question : Higher organisms have resorted to sexual reproduction in spite of its complexity, Why?

Question : Higherconcentrationof DDT is foundin thirdtrophiclevel than firsttrophic level a) Name the phenomenonassociatedwiththe accumulation of DDTb) Bird populationis decreasedbythe accumulationof DDT How is it occurs ?

Question : High osmolarity of inner medullary interstitium is mainly caused by -

Question : High DDT pollutionin waterbodies caused declinein bird population . Evaluate .

Question : High dose of which of the following can cause snow blindness?

Question : High content of carboxyhemoglobin in blood isassociated with

Question : High CO_2 compensation point is found in

Question : hich one is appropriate pair ?

Question : Hiccups can be best described as

Question : hGH extractedformdeadhumanmayresultintogenticdiseaseknownas

Question : Hiccough (hiccup) is due to activity of: