Question: From NCERT NEET Derived PYQ
What do secondary carnivores refer to?
1. Animals at second trophic level
2. Those animals that depend on the herbivores for food
3. Those animals that depend on the primary carnivores for food
4. Those animals that depend on the secondary herbivores for food
Answer ▽
3. Those animals that depend on the primary carnivores for food
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Question: From NCERT NEET Derived PYQ
The detritus food chain (DFC) begins with________________. It is made up of decomposers which are ______________organisms, mainly________________. They meet their energy and nutrient requirements by degrading ______________.
1. detritus, heterotrophic, earthworm and dead organic matter.
2. dead organic matter, heterotrophic, fungi and bacteria, dead organic matter.
3. dead organic matter, autotrophic, fungi and plants, dead organic matter.
4. grass, heterotrophic, fungi and bacteria, dead organic matter.
Answer ▽
2. dead organic matter, heterotrophic, fungi and bacteria, dead organic matter.
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Question: From NCERT NEET Derived PYQ
What is the major conduit for energy flow in an aquatic ecosystem?
1. Grazing food chain
2. Detritus food chain
3. Sun
4. Hydrothermal vents
Answer ▽
1. Grazing food chain
Solution:
Food chain is the linear sequence of organisms where latter eats the former.
There are two types of food chains: grazing food chain (GFC) and detritus food chain (DFC).
GFC starts with green plants as producers and ends at secondary carnivores.
The DFC begins with dead organic matter and is made up of decomposers which meet their energy and nutrient requirements by degrading dead organic matter or detritus.
In an aquatic ecosystem GFC is the major conduit for energy flow,
while in a terrestrial ecosystem, a much larger fraction of energy flows through DFC than through the GFC.
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Question: From NCERT NEET Derived PYQ
“Detritus food chain may be connected with the grazing food chain at some levels” this is evident from
(i). Some of the organisms of DFC are prey to the GFC animals
(ii). In a natural ecosystem, some animals like cockroaches, crows, etc., are omnivores.
(iii). Some of the organisms of GFC are facultative decomposers
1. i and iii
2. i and ii
3. ii and iii
4. i only
Answer ▽
2. i and ii
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Question: From NCERT NEET Derived PYQ
The standing crop is measured as the-
1. Mass of living organisms in a unit area.
2. The number of living organisms in a unit area.
3. Calculated from the net primary productivity
4. Both 1 and 2.
Answer ▽
4. Both 1 and 2.
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Question: From NCERT NEET Derived PYQ
What does 10 per cent law say?
1. Less than 10 per cent of the energy is transferred to each trophic level from the lower trophic level
2. Only 10 per cent of the energy is transferred to each trophic level from the lower trophic level
3. Only 10 per cent of the energy is assimilated from the eaten food
4. Consumer gains 10 per cent mass of the consumed food
Answer ▽
2. Only 10 per cent of the energy is transferred to each trophic level from the lower trophic level
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Question: From NCERT NEET Derived PYQ
Identify the relationship represented by the pyramid
1. Pyramid of number
2. Pyramid of biomass
3. Pyramid of energy
4. None of the above
Answer ▽
2. Pyramid of biomass
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Question: From NCERT NEET Derived PYQ
Which of the following pyramid represents the pyramid of number in grassland?
A
B
C
1. A
2. B
3. C
4. B & C
Answer ▽
3. C
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Question: From NCERT NEET Derived PYQ
Which of the following statement is incorrect?
1. Only three top-carnivores are supported in an ecosystem based on production of nearly 6 million plants.
2. Pyramid of biomass shows a sharp increase in biomass at higher trophic levels.
3. Pyramid of biomass is inverted if small standing crop of phytoplankton supports large standing crop of zooplankton.
4. Pyramid of energy is always upright.
Answer ▽
2. Pyramid of biomass shows a sharp increase in biomass at higher trophic levels.
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Question: From NCERT NEET Derived PYQ
If the available energy at first trophic level is 10000 J then how much trophic levels it could support further?
1. 2
2. 3
3. 4
4. 5
Answer ▽
2. 3
According to the 10 percent law, only 10% of the energy is transferred to each trophic level from its lower trophic level. If 10,000 joules of energy is available to the producer, then only 1000 joules of energy will be available to the primary consumer and only 100 joules of energy will be available to the secondary consumer. The energy available with the tertiary consumer will be 10 joules of energy.
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Question: From NCERT NEET Derived PYQ
Which of the following statement is incorrect?
1. Any calculations of energy content, biomass or numbers, has to include all organisms at that trophic level.
2. The base of each pyramid represents the producers or the first trophic level while the apex represents tertiary or top level consumer
3. The trophic level represents a functional level, not a species as such.
4. A given species occupy only one trophic level in the same ecosystem at the same time.
Answer ▽
4. A given species occupy only one trophic level in the same ecosystem at the same time.
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