Ecology and Environment

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In the equationGPP - R = NPPGPP is Gross Primary ProductivityNPP is Net Primary ProductivityR here is ______. Answer: 4. Respiratory loss Key idea: Net primary productivity is the gross primary productivity left after plants use some for their own re... Productivity and decomposition 1 answer
Identify the correct statements :A. Detrivores perform fragmentation.B. The humus is further degraded by some microbes during mineralization.C. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.… Answer: 2. A, B, C only Key idea: Check each statement on decomposition. A is true: detritivores break detritus into smaller pieces (fragmen... Productivity and decomposition 1 answer
The thickness of ozone in a column of air in the atmosphere is measured in terms of : Answer: 2. Dobson units Key idea: Ozone thickness in a column of air is measured in Dobson units (DU). Kilobase measures DNA length, decibel... Biodiversity: concept, patterns, importance, loss 1 answer
Among 'The Evil Quartet', which one is considered the most important cause driving extinction of species? Answer: 2. Habitat loss and fragmentation Key idea: Of the four causes in the "Evil Quartet", habitat loss and fragmentation is the most imp... Biodiversity: concept, patterns, importance, loss 1 answer
Given below are two statements :Statement I :In a scrubber the exhaust from the thermal plant is passed through the electric wires to charge the dust particles.Statement II :Particulate matter (PM 2.5) can not be removed by scrubber but can be remove… Answer: 1. Statement I is incorrect but Statement II is correct Key idea: Electric charging of dust belongs to the electrostatic precipitato... Biodiversity: concept, patterns, importance, loss 1 answer
In-situ conservation refers to : Answer: 2. Protect and conserve the whole ecosystem Key idea: In-situ conservation protects species in their natural habitat, so the whole e... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
If '8' Drosophila in a laboratory population of '80' died during a week, the death rate in the population is ______ individuals per Drosophila per week. Answer: 2. 0.1 Key idea: Death rate per individual = deaths ÷ population size. death rate = 8/80 = 0.1 individuals per Drosophila per week. Population attributes: growth, birth and death rate, age distribution 1 answer
Detritivores breakdown detritus into smaller particles. This process is called : Answer: 3. Fragmentation Key idea: Detritivores such as earthworms break detritus into smaller particles. This step is fragmentation. It is... Productivity and decomposition 1 answer
The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false ? Answer: 3. The same diesel engine is used in CNG buses making the cost of conversion low The false statement is that the same diesel engine... Biodiversity: concept, patterns, importance, loss 1 answer
Which one of the following will accelerate phosphorus cycle ? Answer: 4. Weathering of rocks Phosphorus comes mainly from rocks, and weathering of rocks releases phosphates into the soil, which speeds u... Ecosystem patterns and components 1 answer
While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (-) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for o… Answer: 2. Predation Predation is (+) for the predator and (-) for the prey. Competition is (-,-), amensalism is (-,0) and commensalism is (... Population interactions: mutualism, competition, predation, parasitism 1 answer
Habitat loss and fragmentation, over exploitation, alien species invasion and co-extinction are causes for : Answer: 4. Biodiversity loss Habitat loss and fragmentation, over-exploitation, alien species invasion and co-extinction are the four major... Biodiversity: concept, patterns, importance, loss 1 answer
Which of the following is not a method of ex situ conservation ? Answer: 3. National Parks National parks protect organisms in their natural habitat, so they are in situ conservation. Cryopreservation, in... Biodiversity conservation: hotspots, Red Data Book, biosphere reserves, national parks, sacred groves 1 answer
Which one of the following statements cannot be connected to Predation ? Answer: 4. Both the interacting species are negatively impacted In predation, one species (predator) benefits (+) and the other (prey) is ha... Population interactions: mutualism, competition, predation, parasitism 1 answer
Given below are two statements :Statement I :Decomposition is a process in which the detritus is degraded into simpler substances by microbes.Statement II :Decomposition is faster if the detritus is rich in lignin and chitinIn the light of the above… Answer: 4. Statement I is correct but Statement II is incorrect Statement I: decomposition breaks detritus into simpler substances through m... Productivity and decomposition 1 answer
The device which can remove particulate matter present in the exhaust from a thermal power plant is : Answer: 4. Electrostatic Precipitator An electrostatic precipitator removes particulate matter from the exhaust of thermal power plants. Its... Biodiversity: concept, patterns, importance, loss 1 answer
Dobson units are used to measure thickness of : Answer: 3. Ozone Dobson units measure the thickness of the ozone layer (1 DU = 0.01 mm of pure ozone at standard temperature and pressure).... Biodiversity: concept, patterns, importance, loss 1 answer
Match List - I with List - II.List - I / List - II(a) Allen's Rule (i) Kangaroo rat(b) Physiological adaptation (ii) Desert lizard(c) Behavioural adaptation (iii) Marine fish at depth(d) Biochemical adaptation (iv) Polar sealChoose the correct answer… Answer: 3. (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii) Allen's rule (shorter extremities in colder climates) - polar seal (iv) Physiological adap... Population interactions: mutualism, competition, predation, parasitism 1 answer
In the exponential growth equation N_t=N_0e^rt, e represents : Answer: 3. The base of natural logarithms In N_t=N₀e^rt , e is Euler's number (about 2.718), the base of natural logarithms. The other names... Population attributes: growth, birth and death rate, age distribution 1 answer
The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as : Answer: 3. Standing state The amount of nutrients such as C, N, P and Ca present in the soil at a given time is the standing state. Standing... Ecosystem patterns and components 1 answer
Which of the following statements is not correct ? Answer: 2. Pyramid of biomass in sea is generally upright. Find the statement that is not correct. In the sea, producers are tiny phytoplank... Energy flow and ecological pyramids 1 answer
Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival ? Answer: 1. Resource partitioning When two species compete for the same resource, they may evolve ways to share it. This is resource partitio... Population interactions: mutualism, competition, predation, parasitism 1 answer
Amensalism can be represented as : Answer: 1. Species A ( - ) ; Species B (0) Amensalism is an interaction in which one species is harmed and the other is unaffected. So it is... Population interactions: mutualism, competition, predation, parasitism 1 answer
In the equation GPP-R=NPPR represents : Answer: 4. Respiration losses Net primary productivity is gross primary productivity minus the energy used by plants in respiration. So NPP... Productivity and decomposition 1 answer

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