24277 + Interview Questions in Biology in Class 12 Page 246 InterviewSolution

12251.	Question : Name an opioid drug and its source and its source plant.How it is useful in medical field?
Answer» Solution :Morphine is an opioid DRUG which is EXTRACTED flowers of the POPPY plant.It is used as a strong pain killer during surgery

Discussion

12252.	Question : Name an oral pill used as contraceptive in females. How does it prevent pregnancy?
Answer» Solution :Mala-D or SAHELI are the contraceptive pills used by human female in India. They stop the secretion of FSH and LH and THEREBY inhibit the ovulation. The oocytes are not RELEASED from the OVARY and thus pregnancy is prevented.

Discussion

12253.	Question : Name an opium drug and its source plant. How does the drug affect the human body?
Answer» Solution :Opium. It is OBTAINED from poppy PLANT, Papaver somniferum. It is the most EFFECTIVE pain KILLER.

Discussion

12254.	Question : Name an omnivore which occurs in both grazing food chain and the decomposer food chain.
Answer» SOLUTION :SPARROW / CROW.

Discussion

12255.	Question : Name an instrumentused in vehicles to reduce air pollution .
Answer» SOLUTION :Calytic CONVERTERS .

Discussion

12256.	Question : Name an industry which can cause both air and thermal pollution and as well as eutrophication.
Answer» Solution :Fertiliser factory, THERMAL power plant, plant REFINERIES, smelting. They are used in industries which uses steam or water as a coolent. It CAUSES both AIR and thermal pollution.

Discussion

12257.	Question : Name an immunosuppressive agent.
Answer» SOLUTION :Cyclosporin A-produced from fungus TRICHODERMA polysporum, It is used as immune suppressive agent in ORGAN TRANSPLANT patients.

Discussion

12258.	Question : Name a weed which has a sequenced genome.
Answer» SOLUTION :ARABIDOPSIS thaliana

Discussion

12259.	Question : Name a tabular cavity which connects the 3rd ventricle in diencephalon to 4th ventricle in hind brain.
Answer» ANSWER :ITER / Adqueduct of SYLVIUS

Discussion

12260.	Question : Name a recombinant vaccine that is currently (8 being used in vaccination program.
Answer» Solution :HEPATITIS B recombinant vaccine-engerix is USED for vaccination of hepatitis VIRUS.

Discussion

12261.	Question : Name a prominent aperture in pollen grain exine.
Answer» ANSWER :Germopore

Discussion

12262.	Question : Name a plant where diadelphous type of statement are present.
Answer» ANSWER :LATHYRUS.

Discussion

12263.	Question : Name a place where dried plant specimens are pressed and kept on sheet.
Answer» ANSWER :HERBARIUM

Discussion

12264.	Question : Name a place where organisms are preserved using preservatives?
Answer» ANSWER :BIOLOGICAL MUSEUM

Discussion

12265.	Question : Name a pair of optic lobes that controls visual reflex.
Answer» ANSWER :SUPERIOR colliculi

Discussion

12266.	Question : Name a 'natural genetic engineer' of plants.
Answer» SOLUTION :AgrobacteriwlI tumejaciens

Discussion

12267.	Question :Name a new breed of sheep developed in Punjab by cross breeding technique.
Answer» SOLUTION :HISARDALE.

Discussion

12268.	Question : Name a microbe which serves as a biofertilliser in the paddy field.
Answer» SOLUTION :ANABAENA

Discussion

12269.	Question : Name a microbial biocontrol agent.
Answer» SOLUTION :BACILLUS thuringiensis.

Discussion

12270.	Question :Name a microbe used for statin production. How do statins lower blood cholesterol level?
Answer» Solution : Monascus purpureus is used for the production of statin. Statins inhibit cholesterol SYNTHESIS COMPETITIVELY inhibiting action of enzyme HMG CoA reductase in LIVER REQUIRED for cholesterol synthesis.

Discussion

12271.	Question : Name a microbe used for statin production. How do statins lower blood cholesterol level ?
Answer» SOLUTION :Monascuspurpureusa yeast is USED to produced statins, which LOWERS blood CHOLESTEROL level by competitively inhibiting the enzyme responsible for the synthesis of cholesterol.

Discussion

12272.	Question : Name a median fold of mucous membrane that joins tongue with the floor of mouth.
Answer» ANSWER :FRENUM

Discussion

12273.	Question : Name a man-made cereal. Trace how it was developed and where it is used ?
Answer» Solution :Triticale. It was DEVELOPED by CROSSING Triticum aestivum(WHEAT) and Secale cerale (European RYE, rye)

Discussion

12274.	Question : Name a living fossil
Answer» ANSWER :LATIMERIA - the COELACANTH

Discussion

12275.	Question : Name a hormone releasing IUD.
Answer» Solution :Homone RELEASING IUD : LNG- 20, Progestasert

Discussion

12276.	Question : Name a group of organisms that constitute 70% of all species in the earth 's Biodiversity.
Answer» ANSWER :ANIMALS

Discussion

12277.	Question : Name a fungus that produces bioactive molecule cyclosporin A which is used as an immuno suppressive agents in organ-transplant patient.
Answer» ANSWER :TRICHODERMA POLYSPORUM

Discussion

12278.	Question : Name a fungus used for the control of pest.
Answer» SOLUTION :TRICHODERMA SPECIES.

Discussion

12279.	Question : Name a fresh water fish.
Answer» Hilsa Sardin MAJOR CARP Macrel SOLUTION :Major carp

Discussion

12280.	Question : Name a few enzymes involved in DNA replication other than DNA polymerase and ligase. Name the key functions for each of them.
Answer» Solution :(i) Helicase - opens the HELIX (ii) TOPOISOMERASES - removes the super coiling of DNA (iii) Primase synthesises RNA primer (iv) TELOMERASE to synthesises the DNA of TELOMERIC end of chromosomes.

Discussion

12281.	Question : Name a disorder a human suffers from as a result of monosomy of the sex chromosome. Give the karyotype and write the symptoms.
Answer» Solution :Monosomy of the sex chromosome disorder is Turner's syndrome. KARYOTYPE of Turner's syndrome. Karyotype of Turner's syndrome is 22 + XO. It is CAUSED by the absence of an X chromosome. Such females are sterile with rudimentary ovaries. Secondary SEXUAL CHARACTERS are LACKING.

Discussion

12282.	Question : Name a causative organism of pneumonia
Answer» SOLUTION :STREPTOCOCCUS PNEUMONIAE and HAEMOPHILUS influenzae.

Discussion

12283.	Question :Name a biopesticide obtained from neem
Answer» SOLUTION :Azadirachtin

Discussion

12284.	Question : Name a cancer-causing chemical found in tobacco.
Answer» SOLUTION :BENZOPYRENE

Discussion

12285.	Question : Name a bioactive molecule produced by Trichoderma polysporum. Mention the significance also.
Answer» SOLUTION :CYCLOSPORIN. It is an immunosppressive AGENT USED in organ-transplant PATIENTS.

Discussion

12286.	Question : Name two biodegradable pollutants.
Answer» ANSWER :A::C::D

Discussion

12287.	Question : Name a bacterium that causes typhoid.
Answer» ANSWER :SALMONELLA typhi

Discussion

12288.	Question : Naked pedicellate, tricarpellary female flower surrounded by many naked male flowers is characteristic of
Answer» VERTICILLASTER CYATHIUM HYPANTHODIUM Scapigerous cyme Answer :2

Discussion

12289.	Question : NADPH is generated through
Answer» photosystem-I photosystem-II anaerobic RESPIRATION glycolysis Solution :NADPH is generated through photosystem-II in non-CYCLIC photophosphorylation (which INVOLVES both PS-I and II) protons released from photolysis and electrons emitted from `P_(700)` are ultimately passed on to `NADP^(+)` resulting in the formation of NADPH. In cyclic photophosphorylation (which involves only PS-I) electrons FLOW in a cyclic manner but there is not net formation of NADPH and `O_(2)`.

Discussion

12290.	Question : NADPH is released in cyclicphotophosphorylation.
Answer» ANSWER :Non-cyclic

Discussion

12291.	Question : NADP^(+) is reduced to NADPH in
Answer» PS-I PS-II Calvin cycle Non-cyclic photophosphorylation Solution :In photosynthesis during non-cyclic photophoshorylation involving both PS-I and PS-II, electrons released during photolysis of water are transferred to PS-II and then PS-I VIA a series of electron carriers. `P_(700)` of PS-I releases electron after ABSORBING light energy This electron passes through CHLOROPHYLL X, Fe-S, ferredoxin and finally to `NADP^(+).NADP^(+)` combines with `H^(+)` (released during photolysis) with the help of NADP REDUCTASE to form NADPH. `NADP^(+)+2e^(-)+H^(+)overset("NADP reductase")toNADPH`

Discussion

12292.	Question : NADH^(+)H^(+)is utilized in this reaction during alcoholic fermentation
Answer» Conversion of PYRUVIC acid to ACETALDEHYDE Conversion of GAP to Bisphosphoglyceric acid Conversion of Acetaldehyde to ETHYL alcohol Conversion of Pyruvic acid to AcetylCO-A Answer :C

Discussion

12293.	Question : NAD^(+)" and "NADP^(+) pesemble each other in ability to
Answer» GIE out a proton TAKE up TWO electrons at one time Take up two hydrogen ATOMS Take up one ELECTRON at one time. Solution :N//A

Discussion

12294.	Question : NaCl is harmful to most crop plants. A scientist at the University of Toronto genetically modified a plant so that it could be grown in dry parts of the world where the available water has a high level of NaCl. This genetically modified plant copes with the high levels of NaCl by transporting salt into its vacuoles where it accumulated to abnormally high level. which feature would be observed in the genetically modified plant when compared to a non-modified plant ?
Answer» The leaves in the MODIFIED plant are more yellow in colour The modified plant has salt srystals on the surface of its leves The cytosol (the materal between the plasma membrane and the vacuole membrane, excluding the organelles) in the modified plant has a lower osmotic pressure The cytosol in the modified plant has a higher osmotic pressure Solution :Osmotic pressure is the pressure required to stop the flow of pure WATER or solvent into a solution across a partially permeable membrane. Water moves from a region of low osmotic pressure to a region of high osmotic pressure. As high levels of NACL is accumulated in the cells of modified plant. the osmotic pressure of the cytosol is increased. Accumulation of SALTS in vacuoles CAUSES compartmentalisation of salt away from cytosol and protects cytosol form harmful effects of the high salt concentration.

Discussion

12295.	Question : Na^+//K^+ pump in a cell is a example of:
Answer» Osmosis Diffusion Passive transport Active transport Answer :D

Discussion

12296.	Question : N_2 - fxing bacteria in legume plants are:
Answer» AZOTOBACTER FRANKIA Rizobia NONE SOLUTION :FUNGUS

Discussion

12297.	Question : N_2 - fixing bacteria in non-legume plants are:
Answer» Frukia RHIZOBIA PLASMODIUM ASPERGILLUS SOLUTION :Rrizobia

Discussion

12298.	Question : N-Glycosidic linkage contains(A) Triglyceride(B) Dipeptide(C) Disaccharide(D) Nucleoside
Answer» Triglyceride Dipeptide DISACCHARIDE NUCLEOSIDE ANSWER :D

Discussion

12299.	Question : in case of Bt cotton, how does the toxic insecticide protein produced by the bacterium kills the insect pest but not the cell of Bacillus thuringiensis where the toxic protein is generated?
Answer» SOLUTION :Some strains of Bacillus thuringiensis produce proteins that kill certain insects as lepidopterans (tobacco budworm, armyworm). Bt forms protein crystals during a particular phase of their GROWTH. These crys tals contain a toxic insecticidal protein. But toxin does not kill the Bacillus. Because the Bt toxin protein exists as inactive protoxins but once an insect ingests the inactive toxin, it is converted into an active FORM of toxin due to the alkaline pH of the gut which solubilise the crystals. The activated toxin binds to the surface of midgut epithelial cells and CREATES pores that cause CELL swelling and lysis and eventu ally cause death of the insect.

Discussion

12300.	Question : n both chordates and non-chordates inner lining of intestine develops from
Answer» EPIDERMIS Ectoderm ENDODERM Mesoderm Answer :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : Name an opioid drug and its source and its source plant.How it is useful in medical field?

Question : Name an oral pill used as contraceptive in females. How does it prevent pregnancy?

Question : Name an opium drug and its source plant. How does the drug affect the human body?

Question : Name an omnivore which occurs in both grazing food chain and the decomposer food chain.

Question : Name an instrumentused in vehicles to reduce air pollution .

Question : Name an industry which can cause both air and thermal pollution and as well as eutrophication.

Question : Name an immunosuppressive agent.

Question : Name a weed which has a sequenced genome.

Question : Name a tabular cavity which connects the 3rd ventricle in diencephalon to 4th ventricle in hind brain.

Question : Name a recombinant vaccine that is currently (8 being used in vaccination program.

Question : Name a prominent aperture in pollen grain exine.

Question : Name a plant where diadelphous type of statement are present.

Question : Name a place where dried plant specimens are pressed and kept on sheet.

Question : Name a place where organisms are preserved using preservatives?

Question : Name a pair of optic lobes that controls visual reflex.

Question : Name a 'natural genetic engineer' of plants.

Question :Name a new breed of sheep developed in Punjab by cross breeding technique.

Question : Name a microbe which serves as a biofertilliser in the paddy field.

Question : Name a microbial biocontrol agent.

Question :Name a microbe used for statin production. How do statins lower blood cholesterol level?

Question : Name a microbe used for statin production. How do statins lower blood cholesterol level ?

Question : Name a median fold of mucous membrane that joins tongue with the floor of mouth.

Question : Name a man-made cereal. Trace how it was developed and where it is used ?

Question : Name a living fossil

Question : Name a hormone releasing IUD.

Question : Name a group of organisms that constitute 70% of all species in the earth 's Biodiversity.

Question : Name a fungus that produces bioactive molecule cyclosporin A which is used as an immuno suppressive agents in organ-transplant patient.

Question : Name a fungus used for the control of pest.

Question : Name a fresh water fish.

Question : Name a few enzymes involved in DNA replication other than DNA polymerase and ligase. Name the key functions for each of them.

Question : Name a disorder a human suffers from as a result of monosomy of the sex chromosome. Give the karyotype and write the symptoms.

Question : Name a causative organism of pneumonia

Question :Name a biopesticide obtained from neem

Question : Name a cancer-causing chemical found in tobacco.

Question : Name a bioactive molecule produced by Trichoderma polysporum. Mention the significance also.

Question : Name two biodegradable pollutants.

Question : Name a bacterium that causes typhoid.

Question : Naked pedicellate, tricarpellary female flower surrounded by many naked male flowers is characteristic of

Question : NADPH is generated through

Question : NADPH is released in cyclicphotophosphorylation.

Question : NADP^(+) is reduced to NADPH in

Question : NADH^(+)H^(+)is utilized in this reaction during alcoholic fermentation

Question : NAD^(+)" and "NADP^(+) pesemble each other in ability to

Question : Na^+//K^+ pump in a cell is a example of:

Question : N_2 - fxing bacteria in legume plants are:

Question : N_2 - fixing bacteria in non-legume plants are:

Question : N-Glycosidic linkage contains(A) Triglyceride(B) Dipeptide(C) Disaccharide(D) Nucleoside

Question : in case of Bt cotton, how does the toxic insecticide protein produced by the bacterium kills the insect pest but not the cell of Bacillus thuringiensis where the toxic protein is generated?

Question : n both chordates and non-chordates inner lining of intestine develops from