24277 + Interview Questions in Biology in Class 12 Page 253 InterviewSolution

12601.	Question : Millions of chicken were killed in West Bengal, Assam, Orissa and Maharashtra recently, What was the reason ?
Answer» Solution :Millions of chicken were killed (CULLED) in West Bengal, Orissa and Maharashtra. These CHICKENS found to be INFECTED with `H_5N_1` virus, the CAUSATIVE ORGANISM of Bird Flu.

Discussion

12602.	Question : Miller performed an experiment by recreating in the laboratory the probable conditions of the atmoshphere of primitive earth. (i)What was the purpose of the experiment ? (ii)In what forms was energy supplied for chemical reactions to occur ? ( iii)For how long the experiment was run continuously ?
Answer» SOLUTION :To confirm ABIOGENESIS (ORIGIN of life from inorganic MATTER), electric spark and heat , ONE week

Discussion

12603.	Question : Miller conducted his experiment in an apparatus containing methane, ammonia and hydrogen in the ratio of
Answer» `2:5:4` `2:1:2` `5:4:1` NONE ANSWER :B

Discussion

12604.	Question : Milky water of green cocount is:
Answer» LIQUID chalaza Liquid endosperm Liquid nucellus Liquid FEMALE gametophyte Answer :B

Discussion

12605.	Question : Milky water of green coconut is(A) liquid of female gametophyte(B) liquid endosperm(C) liquid chalaza(D) liquid nucellus
Answer» LIQUID of FEMALE gametophyte liquid endosperm liquid chalaza liquid nucellus Answer :B

Discussion

12606.	Question : Milk yielding breed of cattle are called _____.
Answer» ANSWER :MILCH BREED

Discussion

12607.	Question : Milk yielding breeds of cattle are called________________.
Answer» ANSWER :MILCH BREEDS

Discussion

12608.	Question : Milk starts to coagulate when Lactic Acid Bacteria (LAB) is added to warm milk as a starter. Mention any two other benefits that LAB provides.
Answer» SOLUTION : (a) LAB improve nutritional quality by increasing vit. `B_12` . (b) LAB present in our STOMACH, check disease-causing MICROBES.

Discussion

12609.	Question : Milk secreted by the alveoli of mammary lobes travels through the following structures to the exterior. Lactiferous duct Mammary ducts Mammary ampulla Mmmary tubule identify the correct sequence.
Answer» 1 - 2 - 3 - 4 2 - 4 - 3 - 1 4 - 3 - 2 - 1 4 - 2 - 3 - 1 Answer :D

Discussion

12610.	Question :Milk is spoiled or fermented by(A) Rhizobium(B) Lactobacillus(C) Azotobacter(D) Clostridium
Answer» RHIZOBIUM LACTOBACILLUS Azotobacter CLOSTRIDIUM SOLUTION :Lactobacillus

Discussion

12611.	Question : Milk is fermented or curdled by
Answer» RHIZOBIUM Lactobacillus Azotobacter CLOSTRIDIUM ANSWER :B

Discussion

12612.	Question : Mild tertian malaria is caused by which blood parasite?
Answer» ANSWER :PLASMODIUM OVALE

Discussion

12613.	Question : "Migration may enhance or blurr the effects of selection." Comment.
Answer» Solution :Migration involves both immigration and emigration. Immigration adds new GENE complements to the population.s gene pool and emigration removes gene complements from the gene pool. THUS, migration may add (DUE to immigration) or remove (due to emigration) those alleles which are being selected or favoured by nature ENHANCING the effect of selection.

Discussion

12614.	Question : Migratory fishes are
Answer» EURYHALINE with aglomerular KIDNEYS STENOHALINE with aglomerular kidneys Stenohaline with GLOMERULAR kidneys Euryhaline with glomerular kidneys Answer :D

Discussion

12615.	Question : Migration may enhance or blurr the effects of selection. Comment.
Answer» Solution :Migration INVOLVES entry or exit ofsome members of population into or from area. Migration MAY cause enrichment of the gene pool of such ALLELES that are being selected for, or blurr the effects of SELECTION through repleshment of alleles that were selected against by nature.

Discussion

12616.	Question : Migration, ecesis and aggregation are collectively called as invasion.
Answer» ANSWER :1

Discussion

12617.	Question : midwife toad is
Answer» alytes pipa bufa Disoglossus Answer :a

Discussion

12618.	Question : Middle lamella is present
Answer» inside the secondary wall inside the primary wall outside the primary wall in between secondary and tertiary walls Solution :Middle lamella is a thin, binding LAYER between the CELL wall of adjacent plant cells. It is CHEMICALLY formed of pectates of calcium and MAGNESIUM. It is present outisde the primary wall.

Discussion

12619.	Question : Microvilli which found on the free surface of cells and help in secretion and absorption is found in the lining of –
Answer» STOMACH and bronchioles FALLOPIAN TUBE and bronchioles Gall BLADDER and Intestine Gall bladder and Fallopian tube Answer :C

Discussion

12620.	Question : Micturition is ?
Answer» a REFLEX phenomenon voiding of urine voluntarily controlled All of the above Answer :D

Discussion

12621.	Question : Microtubules takes part in:
Answer» MUSCLE contraction Secretion Cell division Cell WALL architecture Answer :C

Discussion

12622.	Question : Microsporophll of Cycas is
Answer» flat wedge-shaped triagular All of these ANSWER :D

Discussion

12623.	Question : Microsporangium is generally surrounded by four wall layers. Name the layer which nourishes developing pollen grains.
Answer» SOLUTION :TAPETUM

Discussion

12624.	Question : Microspores are haplold.
Answer» ANSWER :1

Discussion

12625.	Question : Microspheres
Answer» SOLUTION :The large organic molecules which were synthesized abiotically on primitive earth LATER CAME together and due to inter moleculer attraction, they formed large COLLOIDAL aggregates. Such WATER bound aggregates have been named microspheres by Sydney Fox.

Discussion

12626.	Question : Microscopic aquatic organisms lacking locomotory ability and drifting with water current are
Answer» Pleuston Nekton Plankton Seston ANSWER :C

Discussion

12627.	Question : Microscopic structure of the flower that contains vegetative cell ?
Answer» Embryosac Egg apparatus Male gametophyte Nucellus Answer :C

Discussion

12628.	Question : Micropyle in seed helps the entry of(A) pollen tube(B) water(C) male gamete(D) female gamete
Answer» POLLEN tube water male gamete female gamete Answer :B

Discussion

12629.	Question : Define:- Micropyle
Answer» Solution :Integuments encircle TH NUCELLUS except at the tip where a small OPENING called the MICROPYLE is organised

Discussion

12630.	Question : Microorganisms have been very useful in elucidating different effects of the mutations because
Answer» They have short lifespan and MANY generations may be studied within a LIMITED period They are haploid and therefore, express all the mutations induced in them they can be easily cultured under controlled condition on simple and DEFINED media All of the above Answer :D

Discussion

12631.	Question : Microorganisms live as a symbiotic association in leguminous plant.(A) Rhizobium(B) Baker's fungus(C) Protozoans(D) Virus
Answer» RHIZOBIUM Backer.s fungus Protozoans VIRUS SOLUTION :Rhizobium

Discussion

12632.	Question : Microorganism, which have high rate of biomass production and growth, can beexpected to produce tonnes of protein is :-
Answer» E.coli RHIZOBIUM METHYLOPHILUS Methylotrophus LACTOBACILLUS ANSWER :C

Discussion

12633.	Question : Micronutrients are:
Answer» Mn, NI, Zn O, CU, B Mg, Mn, Mo Ca, S, Fe Answer :A

Discussion

12634.	Question : Micronucleus and macronuleus occur in
Answer» ENTAMOEBA and Plasmodium Entamoeba and Vorticella Paramecium and Vorticella Euglena and Volvax. Answer :C

Discussion

12635.	Question : Microinjection of desired genes into fertilized eggs results in(A) Cloned animals(B) free martins(C) Transgenic animals(D) Recombinant mammals
Answer» CLONED animals FREE martins TRANSGENIC animals RECOMBINANT mammals Solution :Transgenic animals

Discussion

12636.	Question : Microbes used for single cell protein production :
Answer» algae bacteria fungi all the above Solution :all the above

Discussion

12637.	Question : Microbes present in hydrothermal vents where the temperature far exceeds 100^@C is
Answer» CYANOBACTERIA ARCHAEBACTERIA eubacteria none of these ANSWER :B

Discussion

12638.	Question : Microbes play a dual role when used for sewagetreatment as they not onlyhelp to retrieve usablewater butalsogenerate fuel. Writehow this happens?
Answer» Solution :Sewage is TREATED in sewagetreatment plants to makeit less polluting . Thistreament is carried outin two STAGE . (i)Primary treatment : Primary treatmentis a physical process of REMOVAL of small and large particles through filtration and SEDIMENTATION. ii. Secondary treatment : It is a BIOLOGICAL process, thatemploys the heterotrophic bacteria naturally present in the sewage . Thebacterial flows are allowed to sediment, that is calledactivatedsludge . The remainingmajorpart of the sludgein pumpen intolarge tanks called anaerobicsludge digesters. Duringthis digestion, bacteria produce a mixtureof gases. Herethese gases form biogas and can beused as source of energy as inflammable.

Discussion

12639.	Question : Microbes inhabitant:(A) only water(B) water and soil(C) water, soil, land, in a body(D) water, soil, land, in a body and everywhere.
Answer» only WATER water and SOIL water, soil, land, in a body water, soil, land, in a body and EVERYWHERE. SOLUTION :water, soil, land, in a body and everywhere.

Discussion

12640.	Question : Microbes in Sewage Treatment
Answer» Solution :(1)MICROBES play a VITAL role in SEWAGE treatment.(2)The sewage treatment includes three processes,viz,.primary treatment.secondary treatment and tertiary treatment.(3)Of these,secondary and tertiary treatment involve the use of microbes.(4)During secondary treatment when the useful aerobic microbes takes place into flocs.The microbes PRESENT in flocs consume the organic matter present in the effluent.(5)During tertiary when the BOD of waste water is reduced,it is transferred to settling tank where the bacterial flocs sediment.(6)The sediment present at the bottom of the settling tank is known as activated sludge.(7)Major portion of the activated sludge is pumped into the large tanks called anaerobic sludge digesters where anaerobic BACTERIA grow and digest the bacteria and fungi present in the sludge.

Discussion

12641.	Question : Microbes can be used to decrease the use of chemical fertilizers. Explain how this can be acomplished.
Answer» Solution :`""`Rhizobium bacteria PRESENT in the root nodules of leguminous plants a symbiotic association and fixes atmospheric nitrogen into organic forms, which is used by the plant as nutrient. `""`Free-living bacteria in the soil Azospirillum and Azotobacter can fix atmospheric nitrogen thus enriching the nitrogen content of the soil. `**""`MANY members of the genus Glomus (Fungi) form mycorrhizal symbiotic associations with higher plants in these, the fungal symbiont absorbs phosphorus from soil and passes it to the plant. Cyanobacteria like ANABAENA, Nostos, Oscillatoria are autotrophic microbes WIDELY distributed in aquatic and terredtrial environments, which can fix atmospheric nitrogen, also add organic matter to the soil and increase its fertility.

Discussion

12642.	Question : Microbes in industrial vitamin production.
Answer» Solution :(1)Vitamins are organic compounds.(2)They are required in minute quantities for normal growth and development of the BODY.(3)For industrial PRODUCTION of vitamins fermentation TECHNOLOGY is used involving the use of microbes.(4)Below is given a list of vitamins and microbes which are used ibn their production:

Discussion

12643.	Question : Microbes can be used to decrease the use of chemical fertilisers and pesticides. Explain how this can be accomplished.
Answer» Solution :The use of CHEMICAL fertiliser and pesticides can be decreased by the help of organic fertilisers and biotic PASTE. There is a great CONTRIBUTION of MICROBES in fertility of soil. In which bacteria, fungi and cyanobacteria are included.

Discussion

12644.	Question : Microbes are
Answer» protozoan bacteria fungi all of the above Solution :all of the above

Discussion

12645.	Question : Microbe ………….. Grown on large scale as a source of single cell protein.
Answer» Spirulina Erwinia Bollworm Methanobacillus. Answer :A

Discussion

12646.	Question : Micro propagation is based on:
Answer» TISSUE CULTURE Hybridization Microtome GENETIC CONTROL ANSWER :A

Discussion

12647.	Question : Micro propagation is a technique:
Answer» For production of TRUE to type plants For production of HAPLOID plant Form production OD SOMATIC hybrids For production of somaclonal plants Answer :C

Discussion

12648.	Question : Micro-propagation is
Answer» PROPAGATION of MICROBES in vitro Propagation of plants in vitro Propagation of cells in vitro Growing plants on smaller SCALE Solution :This method of producing thousands of plants through tissue CULTURE is called micropropagation. Banana, Apple and Tomato are produced on commercial scale using this method.

Discussion

12649.	Question : Micro propagation involves
Answer» vegetative MULTIPLICATION of PLANTS by USING micro-organisms vegetative multiplication of plants by using small EXPLANTS vegetative multiplication of plants by using microspores Non-vegetative multiplication of plants by using microspores and megaspores ANSWER :B

Discussion

12650.	Question : Micro-organisms having optimum temperature for growth below 15^@C and cannot grow above 20^@C are called as
Answer» MESOPHILE Thermophile Psychrophile NONE of these ANSWER :C

Discussion

Explore topic-wise InterviewSolutions in .

Question : Millions of chicken were killed in West Bengal, Assam, Orissa and Maharashtra recently, What was the reason ?

Question : Miller conducted his experiment in an apparatus containing methane, ammonia and hydrogen in the ratio of

Question : Milky water of green cocount is:

Question : Milky water of green coconut is(A) liquid of female gametophyte(B) liquid endosperm(C) liquid chalaza(D) liquid nucellus

Question : Milk yielding breed of cattle are called _____.

Question : Milk yielding breeds of cattle are called________________.

Question : Milk starts to coagulate when Lactic Acid Bacteria (LAB) is added to warm milk as a starter. Mention any two other benefits that LAB provides.

Question : Milk secreted by the alveoli of mammary lobes travels through the following structures to the exterior. Lactiferous duct Mammary ducts Mammary ampulla Mmmary tubule identify the correct sequence.

Question :Milk is spoiled or fermented by(A) Rhizobium(B) Lactobacillus(C) Azotobacter(D) Clostridium

Question : Milk is fermented or curdled by

Question : Mild tertian malaria is caused by which blood parasite?

Question : "Migration may enhance or blurr the effects of selection." Comment.

Question : Migratory fishes are

Question : Migration may enhance or blurr the effects of selection. Comment.

Question : Migration, ecesis and aggregation are collectively called as invasion.

Question : midwife toad is

Question : Middle lamella is present

Question : Microvilli which found on the free surface of cells and help in secretion and absorption is found in the lining of –

Question : Micturition is ?

Question : Microtubules takes part in:

Question : Microsporophll of Cycas is

Question : Microsporangium is generally surrounded by four wall layers. Name the layer which nourishes developing pollen grains.

Question : Microspores are haplold.

Question : Microspheres

Question : Microscopic aquatic organisms lacking locomotory ability and drifting with water current are

Question : Microscopic structure of the flower that contains vegetative cell ?

Question : Micropyle in seed helps the entry of(A) pollen tube(B) water(C) male gamete(D) female gamete

Question : Define:- Micropyle

Question : Microorganisms have been very useful in elucidating different effects of the mutations because

Question : Microorganisms live as a symbiotic association in leguminous plant.(A) Rhizobium(B) Baker's fungus(C) Protozoans(D) Virus

Question : Microorganism, which have high rate of biomass production and growth, can beexpected to produce tonnes of protein is :-

Question : Micronutrients are:

Question : Micronucleus and macronuleus occur in

Question : Microinjection of desired genes into fertilized eggs results in(A) Cloned animals(B) free martins(C) Transgenic animals(D) Recombinant mammals

Question : Microbes used for single cell protein production :

Question : Microbes present in hydrothermal vents where the temperature far exceeds 100^@C is

Question : Microbes play a dual role when used for sewagetreatment as they not onlyhelp to retrieve usablewater butalsogenerate fuel. Writehow this happens?

Question : Microbes inhabitant:(A) only water(B) water and soil(C) water, soil, land, in a body(D) water, soil, land, in a body and everywhere.

Question : Microbes in Sewage Treatment

Question : Microbes can be used to decrease the use of chemical fertilizers. Explain how this can be acomplished.

Question : Microbes in industrial vitamin production.

Question : Microbes can be used to decrease the use of chemical fertilisers and pesticides. Explain how this can be accomplished.

Question : Microbes are

Question : Microbe ………….. Grown on large scale as a source of single cell protein.

Question : Micro propagation is based on:

Question : Micro propagation is a technique:

Question : Micro-propagation is

Question : Micro propagation involves

Question : Micro-organisms having optimum temperature for growth below 15^@C and cannot grow above 20^@C are called as