24277 + Interview Questions in Biology in Class 12 Page 276 InterviewSolution

13751.	Question : Main objective of production/ use of herbicide resistant GM crop is to:
Answer» encourage eco-friendly herbicides eliminate WEEDS from the field without the use of herbicides reduce herbicide accumulation in FOOD articles for HEALTH safety eliminate weeds from the field without use of manual labour Answer :D

Discussion

13752.	Question : Kangaroo rat in desert is an example of:
Answer» Key stone species Critical LINK species Endemic species DOMINANT species ANSWER :A

Discussion

13753.	Question : Main objective of production / use herbicide resistant GM crops is to
Answer» ELIMINATE weeds from the field without the USE of manual labour eliminate weeds from the field without the use of herbicides encourage eco- FRIENDLY herbicides reduce herbicides accumulation in food ARTICLES for health safety. Answer :D

Discussion

13754.	Question : Kangaroo rat in desert is an example of :
Answer» KEY STONE species Critical LINK species Endemic speies Dominant species Answer :A

Discussion

13755.	Question : Kalyani wrote Man, hen, earthworm, mango tree inher note book. Arrange theterms in a food chain sequnce. Explain food chain and name the type of food chain.
Answer» Solution :Mango tree - Earthworm -Hen - Man Food chainsare sequential ARRANGEMENTS of organisms in such a way that an ANIMAL FEEDS on a plant or on another animal and in turn is food for another. Type of food chain 1. Grazing food chain 2. DETRITUS food chain

Discussion

13756.	Question : Mainobjective of production of weedresistant GM crops is to
Answer» encourage eco-friendly herbicides reduceherbicide accumulation in food products for healthsafety eliminate weedsfrom the field without the use of manual labour eliminate weedsfrom the field withoutthe use of herbicides Solution :WEEDS such as Striga decrease crop YIELDS and quality by competing with crop plants for light, WATER and nutrients. Weeds are to be removed with the help of herbicide (weed killer) Herbicide tolerance has been developed in maize, cotton, SOYBEAN, tobacco, ETC. The main aim is to reduce herbicide accumulation in food products for health safety.

Discussion

13757.	Question : Kajiranga National Park is famous for :-
Answer» ONE HORNED rhino Hangul Wild INDIAN ass Snow Leopard Answer :A

Discussion

13758.	Question : Main function of middle layer is
Answer» MECHANICAL support Protection Storage of food Dehiscence Answer :C

Discussion

13759.	Question : Kaira disease of rice' is due to :
Answer» Fungus Bateria Zn deficiency Mo deficiency Answer :C

Discussion

13760.	Question : Juxtamedullary nephrons are much efficient in reabsorption of components because
Answer» they are FOUND adjacent AREA of cortex with medulla they have larger Bowman's capsules they have long LOOP of Henle and well developed vasa recta they are present in desert animals only ANSWER :C

Discussion

13761.	Question : Main function of glomerulus is
Answer» REABSORPTION of water Filtration of Blood Reabsorption of `Na^(+)` concentration of URINE. ANSWER :B

Discussion

13762.	Question : Juxtaglomerular apparatus is formed by ………. And ………… .
Answer» BOWMAN's CAPSULE, glomerulus PCT, glomerulus DCT, Bowman's capsule DCT, glomerulus Answer :D

Discussion

13763.	Question : Main driving force for ascent of sap through xylem is
Answer» ROOT pressure Transpiration PULL COHESION - adhesion Capillarity Answer :B

Discussion

13764.	Question : Juxta glomerular cells of kidney secrete the hormone ……….. .
Answer» Angiotensinogen Angiotensin II Coherin Renin Answer :D

Discussion

13765.	Question : Main decomposers are
Answer» BACTERIA & fungus EARTHWORM Flagellated PROTOZOANS Flagellated DIATOMS Solution :Bacteria & fungus

Discussion

13766.	Question : Juvenile phase is
Answer» stage of growth in PLANTS stage of embroyonic development stage of growth and maturity in animal life before they can reproduce SEXUALLY. stage of growth and maturity in PLANT life before they can reproduce sexually. Answer :C

Discussion

13767.	Question : Explain Juvenile phase
Answer» Solution :Before reaching SEXUAL mnaturity, all organisms have to undergo a PROPER phase of physical growth. This phase is called juvenile phase. In humans, the juvenile phase LASTS up to 12 to 13 years of age.

Discussion

13768.	Question : Main characterstic of halphytes is
Answer» SUNKEN stomata VIVIPARY Heterophylly All of the above. SOLUTION :MAIN CHARACTERISTIC of halohytes is vivipary.

Discussion

13769.	Question : Jute of commerce is obtained from
Answer» PRIMARY xylem Primary phloem Secondary xylem Secondary phloem Answer :D

Discussion

13770.	Question : Main characteristic of halophytes is
Answer» SUNKEN STOMATA Vivipary Heterophylly All of the above INS. ANSWER :D

Discussion

13771.	Question : Jute is mainly composed of
Answer» xylem secondary bast fibre phloem cortex Solution :JUTE FIBRES OCCUR in long wedge-shaped bundles OUTSIDE the xylem(i.e. phloem fibres). These fibres are called as bast fibres.

Discussion

13772.	Question : Main causes of diseases are genetic disorder, infections and life style.
Answer» ANSWER :T

Discussion

13773.	Question : Justify with the help of two examples where a deliberate attempt by humans has led to the extinction of a particular species on earth.
Answer» SOLUTION :Steller.s seacow, Passenger pigeon and MANY marine FISH populations, which are over harvested, have led to the endangering of some commercially important SPECIES.

Discussion

13774.	Question : Magic antibodies are(A) Semisynthetic antibodies(B) Synthetic antibodies(C) Monoclonal antibodies(D) Antibodies attached to T-Lymphocytes
Answer» SEMISYNTHETIC ANTIBODIES Synthetic antibodies MONOCLONAL antibodies Antibodies ATTACHED to T-lymphocytes. Solution :Monoclonal antibodies

Discussion

13775.	Question : Justify with the help of an example where a deliberate attempt by humans has led to the extinction of a particular species.
Answer» Solution :When NILE Perch, a large predator fish, was introduced in lake VICTORIA, it started feeding on the native fish, chichlid fish, As a result, chichlid fish BECAME instinct and Nile perch, not FINDING any food for itself died too.

Discussion

13776.	Question : Justify the statement "Prevention is better than cure".
Answer» Solution :The AGE old adage of "PREVENTION is better than cure" holds true because HABITS such as smoking, taking drug or alcohol are more likely to be taken up at a young age, more during adolescence. Hence, it is best to identify the SITUATIONS that may push an adolescent towards use of dnigs or alcohol, and to remedial measures well in time. In this regard, the parents and the teachers have a special responsibility. Parenting that combines with high levels of nurturance and consistent discipline, has been associated with lowered RISK of substance (alcohol/drug/tobacco) abuse.

Discussion

13777.	Question : Magic bullets are the
Answer» RECOMBINANT vaccines Monoclonal ANTIBODIES Chemotherapy DRUGS for cancer Anabolic STEROIDS SOLUTION :Monoclonal antibodies

Discussion

13778.	Question : Justify why the survival rate of offsprings in sexual reproduction is high ?
Answer» Solution :Sexual reproduction involves the fusion of the male and the female GAMETES which leads to variations. The variations allow the individuals to adapt under varied environmental conditions for better chances of survival. It is not ALWAYS NECESSARY that the OFFSPRING PRODUCED due to sexual reproduction has better chances of survival. Under some circumstances, asexual reproduction is more advantageous for certain organisms. For example, some individuals do not move from one place to another and are well settled in their environment. Asexual reproduction is a fast and a quick mode of reproduction which does not consume much time and energy as compared to sexual reproduction.

Discussion

13779.	Question : Magic bullets are:
Answer» interferons vaccines Monoclonal antibodies antigen-anitbody cells Answer :C

Discussion

13780.	Question : Justify the statement .Vegetative reproduction is also a type of asexual reproduction..
Answer» SOLUTION :Vegetative PROPAGATION is ALSO a type of asexual reproduction because (i) This is uniparental. (ii) Clone FORMATION takes place. (III) There is no fertilisation. (iv) There is no gamete formation.

Discussion

13781.	Question : Mad cow disease (Bovine spongiform encephalopathy), potato spindle tuber disease, Aster yellow disease of sun flower and tungro disease of rice are respectively, caused by :-
Answer» PRIONS, VIRUS, MYCOPLASMA, VIROIDS Viroids, Prions, Mycoplasma, Virus Virus, Viroids, Mycoplasma, Prions Prions, Viroids, Mycoplasma, Virus Answer :D

Discussion

13782.	Question : Justidy the role of microbes as a bio-fertilizer.
Answer» Solution :Biofertilisers are formulation of living microorganisms that enrich the nutrient wuality of the soil . They increase physico - chemical properties of soils such as soil structure , texture , water holding capacity , cation exchage capacity and pH by providing several nutrients and sufficient organic matter . The main sources of biofertilisers are bacteria , fungi and cyanobacteria. Rhizobium is a classical example for symbiotic nitrogen FIXING bacteria . This bacterium infects the root nodules of lenguminous plants and fixes atmospheric nitrogen into organic forms. Azospirillum and Azotobacter are free living bacteria that fix atmospheric nitrogen and enrich the nitrogen content of soil. A symbiotic association between a fungus and the roots of the plants is called MYCORRHIZA . The fungal symbiont in these associations absorbs the phosphorus from soil and transfers to the plant. Plants having such association shown other benefits such as resistance to rootborne pathogens , tolerance to salinity , drought enhances plant growth and developments . For example , many members of the genus Glomus form mycorrhiza . Cyanobacteria (or) blue gree algae (BGA) are prokaryotic free living organisms which can fix nitrogen . Oscillatoria , Nostoc , Anabaena, Tolypothrixare well known nitrogen fixing cyanobacteria . Their importance is realzedin the water LOGGED paddy fields where Cyanobacteria multiply and fix molecular nitrogen. Cyanobacteria secrete growth promoting substance like indole -3- acetic acis indole -3- butyric acis , naphthalene acetic acid , amino acisds , PROTEINS , vitamins which promotes plant growth and production. Biofertilisers are commonly used in organic farming methods Organic farming is a technique, which involves cultivation of plants and rearing of animalsin natural ways . This process involves the use of biological materials , avoiding synthetic substances to maintain soil fertility and ecological balance thereby minimizing pollution wastage. Key features of organic farming Protecting soil quality using organic materials and encouraging biological activity. Indirect provision of crop nutrients using soil microorganisms. Nitrogen fixation in soils using legumes. Weed and pest control based on methods like crop rotation , biological diversity , natural predators , organic manures and SUITABLE chamical , thermal and biological interventions.

Discussion

13783.	Question : Macula of internal ear refers to
Answer» YELLOW spot Ridge present in otolith ORGAN Ridge PESENT in basilar membrane Crista AMPULLARIS of semicircular cananl Answer :B

Discussion

13784.	Question : Justify the need for signing of 'Montreal Protocol' by the participating nations in1987.
Answer» Solution :An international TREATY called ''Montreal Protocol'' was signed at Montreal (Canada) in 1987 to CONTROL the emission of ozone depleting substances. Protocol LAID down definite road maps, for REDUCING the CFCs and other ozone depleting chemicals.

Discussion

13785.	Question : Justify the pitcher plant as a producer.
Answer» SOLUTION :It is chlorophyllous and is THUS CAPABLE of PHOTOSYNTHESIS.

Discussion

13786.	Question : Justify the need for signing of 'Montreal Protocol' by the participating nations in 1987.
Answer» SOLUTION :Control the EMISSION of ozone DEPLETING substances, which ALLOWS the UV rays to penetrate the earth.s surface and can cause deleterious effects like cataract/skin cancer / AGEING of skin

Discussion

13787.	Question : Macula densa cells regulate the secretion of:
Answer» Renin ADH Paracrine Vasopressin Answer :C

Discussion

13788.	Question : Justify the following statement in terms of ecosystem dynamics. "Nature tends to increase the gross primary productivity, while man tends to increase the net primary productivity".
Answer» Solution :In the conditions of dynamics of ecosystem, the flow of energy moves from one trophic level to the another. `50%` events of sunlight on the earth, are in photosynthetically active radiation. Plants capture 2 to 10 per cent of the PAR to form GPP. Maximum gross primary productivity during respiration and other biotic processes is of `90%`. Gross net primary productivity is used in respiration by plants. SUBTRACTING respiration loses plants use GPP for respiration which is used in second trophic level C herbivores and decomposers. Gross primary productivity of an ecosystem is the rate of production of organic matter during photosynthesis. Therefore to increase gross primary productivity in natural ecosystem, large amount of trees help in ecological system. Net primary productivity is the AVAILABLE biomass for consumption to heterotrophs (herbivores and decomposers). Human beings try to produce net primary productivity by producing other CROPS to fulfill their requirements, develop food. NPP (Formula to find net Primary productivity) `NPPhArrGPP-R`

Discussion

13789.	Question : Macrozoospores of Ulothrix are not
Answer» quadriflagellate uninucleate spherical pear-shaped ANSWER :C

Discussion

13790.	Question : Justify the following sentences : (a) The conersation of endangered species of plants and animalsis necessary . (b) Pollution Under Control (PUC) certificate is mandatory for all vehicles and industries .
Answer» Solution :(a) Need for the conservation of endangered species : (1) Due to loss of habitat, many species are endangered. By conserving them one can maintain the ecosystem balance. (2) Because the natural balance is already disturbed, the conser-vation is a must to restore it back. (3 ) Conservations maintain ecological process and life support system for all the species of liVing beings. (4) Conservation preserves the rich and varied biodiversitywhich is essential for ECONOMIC and social development. (b) Importance of PUC certificate: (1) PUC certificate is mandatory for all the vehicles and indus- tries because it helps to combat' air pollution. (2) In the automobiles, there is incomplete combustion of FUELS which leads to hazardous gaseous effluents such as CO, hydrocarbons, nitrous oxides, etc. These if unchecked can lead to more air pollution. (3) Due to industrial pollution, there is emission of `SO_(2)` in the air. This gas is dangerous for life as well as for materials and property. `SO_(2)` causes discolouration and physical deterioration of building materials and sculptures. It also affects vegetation and is capable of causing irritation to respiratory systems of animals and human. (4) Excessive HEAT generated by machines can also cause thermal pollution and global warming. In order to have control measures on all such HAZARDS, PUC certificate has been made mandatory.

Discussion

13791.	Question : Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:
Answer» WESTERN GHATS MEGHALAYA Corbett National Park KEOLADEO National Park Answer :D

Discussion

13792.	Question : Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold Northern regions move to
Answer» WESTERN GHAT Meghalaya Corbett NATIONAL Park Keolado National Park SOLUTION :Keolado National Park

Discussion

13793.	Question : MAB stands for
Answer» MAN, ANTIBIOTIC and BACTERIA Man and BIOTIC community Man and biosphere Meyer, ANDERSON and Bisby Answer :C

Discussion

13794.	Question : June 5th is celebrated as "World Enviornment Day"what are your suggestion regarding the conservation of nature on this day?
Answer» Solution :CONSERVATION of BIODIVERSITY, pollution control, AFORESTATION, social forestry and SUSTAINABLE AGRICULTURE.

Discussion

13795.	Question : MAB stands for:
Answer» MAN and BIOLOGY programme Mammals and Biology programme Mammala and BIOSPHERE Man and Biosphere programme. Answer :D

Discussion

13796.	Question : Jurassic period of the Mesozoic era characterized by
Answer» Gymnosperms are DOMINANT PLANTS and FIRST birds appear Radiation of reptiles and origin of mammal LIKE reptiles Dinosaurs become EXTINCT and angiosperme appear Flowering plants and first dinosaurs appear Answer :A

Discussion

13797.	Question : June 5th is celebrated as what ?
Answer» ANSWER :A::D

Discussion

13798.	Question : MAB means
Answer» Man and BACTERIA Man and BOTANY Man and BIOTIC community Man and Biosphere SOLUTION :Man and Biosphere

Discussion

13799.	Question : Jumping genes was reported in________
Answer» Neurospora Drosophila Polymerase Maize ANSWER :D

Discussion

13800.	Question : Maatran' was a famous kollywood film casted by Surya and Kajal Agarwal. In the movie, Surya played a dual role as twin brothers - Akhilan and Vimalan, who were joined by birth. Which type of twins does the character represent?
Answer» SOLUTION :SIAMESES TWINES or UNITED TWINS

Discussion

Explore topic-wise InterviewSolutions in .

Question : Main objective of production/ use of herbicide resistant GM crop is to:

Question : Kangaroo rat in desert is an example of:

Question : Main objective of production / use herbicide resistant GM crops is to

Question : Kangaroo rat in desert is an example of :

Question : Kalyani wrote Man, hen, earthworm, mango tree inher note book. Arrange theterms in a food chain sequnce. Explain food chain and name the type of food chain.

Question : Mainobjective of production of weedresistant GM crops is to

Question : Kajiranga National Park is famous for :-

Question : Main function of middle layer is

Question : Kaira disease of rice' is due to :

Question : Juxtamedullary nephrons are much efficient in reabsorption of components because

Question : Main function of glomerulus is

Question : Juxtaglomerular apparatus is formed by ………. And ………… .

Question : Main driving force for ascent of sap through xylem is

Question : Juxta glomerular cells of kidney secrete the hormone ……….. .

Question : Main decomposers are

Question : Juvenile phase is

Question : Explain Juvenile phase

Question : Main characterstic of halphytes is

Question : Jute of commerce is obtained from

Question : Main characteristic of halophytes is

Question : Jute is mainly composed of

Question : Main causes of diseases are genetic disorder, infections and life style.

Question : Justify with the help of two examples where a deliberate attempt by humans has led to the extinction of a particular species on earth.

Question : Magic antibodies are(A) Semisynthetic antibodies(B) Synthetic antibodies(C) Monoclonal antibodies(D) Antibodies attached to T-Lymphocytes

Question : Justify with the help of an example where a deliberate attempt by humans has led to the extinction of a particular species.

Question : Justify the statement "Prevention is better than cure".

Question : Magic bullets are the

Question : Justify why the survival rate of offsprings in sexual reproduction is high ?

Question : Magic bullets are:

Question : Justify the statement .Vegetative reproduction is also a type of asexual reproduction..

Question : Mad cow disease (Bovine spongiform encephalopathy), potato spindle tuber disease, Aster yellow disease of sun flower and tungro disease of rice are respectively, caused by :-

Question : Justidy the role of microbes as a bio-fertilizer.

Question : Macula of internal ear refers to

Question : Justify the need for signing of 'Montreal Protocol' by the participating nations in1987.

Question : Justify the pitcher plant as a producer.

Question : Justify the need for signing of 'Montreal Protocol' by the participating nations in 1987.

Question : Macula densa cells regulate the secretion of:

Question : Justify the following statement in terms of ecosystem dynamics. "Nature tends to increase the gross primary productivity, while man tends to increase the net primary productivity".

Question : Macrozoospores of Ulothrix are not

Question : Justify the following sentences : (a) The conersation of endangered species of plants and animalsis necessary . (b) Pollution Under Control (PUC) certificate is mandatory for all vehicles and industries .

Question : Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:

Question : Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold Northern regions move to

Question : MAB stands for

Question : June 5th is celebrated as "World Enviornment Day"what are your suggestion regarding the conservation of nature on this day?

Question : MAB stands for:

Question : Jurassic period of the Mesozoic era characterized by

Question : June 5th is celebrated as what ?

Question : MAB means

Question : Jumping genes was reported in________

Question : Maatran' was a famous kollywood film casted by Surya and Kajal Agarwal. In the movie, Surya played a dual role as twin brothers - Akhilan and Vimalan, who were joined by birth. Which type of twins does the character represent?