Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Besides curdling of milk, LAB also improve its nutritional quality by increasing vitamin-B12.
Reason: LAB, when present in human stomach, check disease causing microbes.
A: Detritivores and decomposers hold up a part of nutrients contained in detritus.
R: Immobilised nutrients cannot be available for solubilisation after the death of saprotrophs.
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A: Neither the community modifies environment, nor the environment forces the community to leave the place in the climax stage of succession.
R: Climax community is xerophytic in most of the types of succession.
A: Ecological pyramids of biomass are generally inverted in the sea.
R: Biomass of fishes far exceeds that of phytoplanktons.
A: Pyramid of biomass pyramid is always upright for the tree ecosystem.
R: Total biomass of a tree in a specific area is more than that of herbivores.
A: Niche becomes general and broader during biotic succession.
R: Species diversity increases, but organic matter is decreased.
A: Stratification helps in the accommodation of a large number and types of plants in the same area.
R: It is the occurrence of horizontal zonation in the ecosystem.
A: During succession, nutrient availability decreases while biomass level increases.
R: NCP (Net community productivity) remains the same during succession.
A: Decomposers are excluded from the food chains.
R: They act on all trophic levels of a food chain.
Decomposers act at each trophic level.
A: In hydrosere, reed swamp stage is followed by a floating plant stage.
R: Sedge meadow stage has amphibious herbaceous plants.
A: Agriculture and aquacultures are man maintained ecosystems.
R: All biotic and abiotic factors are managed by humans in these ecosystems.
A: Warm and moist environments can enhance the rate of decomposition.
R: Warm and moist climate leads to an anaerobic condition which promotes decomposition.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Process of extinction is random and fast.
Reason (R) : Any species which can not adapt itself according to the environment, it cannot survive.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Biologists are not sure about total number of prokaryotic species
Reason (R) : Nearly 45,000 species of plants and twice as many of animals have been recorded from India
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Percentage of animals is more than the percentage of plants.
Reason (R) : 70% of all the species are animals, while plants contribute nearly 22% of the total.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Biodiversity means diversity at species level.
Reason (R) : Biodiversity is a diversity not only at species level but at all levels of biological organization.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Western ghats of India are one of the hot-spots of biodiversity.
Reason (R) : Western ghats have greater amphibian diversity than eastern ghats.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : There is more species biodiversity in tropical latitudes than in temperate ones.
Reason (R) : Tropical environments, unlike temperate ones, are less seasonal, relatively more constant and predictable.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Loss of habitat is the main cause of loss of biodiversity.
Reason (R) : This causes the increase in edge area and reduction in core area.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Sacred groves are highly protected.
Reason (R) : They are of religious importance to the communities.
Directions : In the following questions a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as :
Assertion (A) : Many species like Steller's sea cow, passenger pigeon, etc., became extinct due to over exploitation.
Reason(R) : Over exploitation is a major cause of biodiversity loss.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Lichen is important for chemical industries.
Reason: Litmus and Orcein are formed from lichens.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Rennet and fruit extract of Withania somnifera have antagonistic functions.
Reason: Rennet is obtained from calf's liver and is used for curdling of milk.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Beer and wine are called soft liquors while gin, rum, etc. are hard liquors.
Reason: Beer and wine are made without distillation.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Acetic acid production involves both aerobic and anaerobic processes.
Reason: Production of alcohol from glucose is an aerobic process and production of acetic acid from alcohol is an anaerobic process.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Secondary treatment of sewage is also called biological treatment while primary treatment is called physical treatment.
Reason: Primary Sewage treatment depends only upon sedimentation properties of materials present in sewage and filtration.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Biogas is used as fuel for cooking and lighting.
Reason: It is considered as eco friendly and pollution free source of energy.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Restriction enzymes recognize palindromic sequence.
Reason: Palindromic sequences read same in both directions of the two strands.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Restriction enzymes of different organisms that recognize the identical sequences are called isoschizomers.
Reason: They are present only in eukaryotes.
Directions: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: Restriction endonucleases are also called 'molecular scissors'.
Reason: When fragments generated by restriction endonucleases are mixed, they join together due to their sticky ends.
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