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Q. No.In a grassland, herbivore population increases. Surprisingly, plant biomass stays constant for 3 years. Soil nitrogen increases during this period. What BEST explains the observation?
1. Herbivores reduce nitrogen fixation
2. Energy flow pyramid becomes inverted
3. Herbivore grazing induces faster plant growth → compensatory response
4. Herbivores become scavengers
1. Herbivores reduce nitrogen fixation
2. Energy flow pyramid becomes inverted
3. Herbivore grazing induces faster plant growth → compensatory response
4. Herbivores become scavengers
Subtopic: Ecosystem Productivity |
63%
Level 2: 60%+
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A graph shows GPP peaking in mid-summer and falling in winter. NPP shows a smaller peak and declines sharply during late summer despite high GPP. Explain:
1. PAR availability declines sharply in late summer
2. Mineral nutrients are highest in winterm reducing GPP in summer
3, Plant respiration increases in late summer, lowering NPP
4. Herbivory decreases respiration in late summer
1. PAR availability declines sharply in late summer
2. Mineral nutrients are highest in winterm reducing GPP in summer
3, Plant respiration increases in late summer, lowering NPP
4. Herbivory decreases respiration in late summer
Subtopic: Ecosystem Productivity |
72%
Level 2: 60%+
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Claim: “Energy pyramids can sometimes be inverted in deep sea ecosystems.” Judge the claim:
1. Claim correct
2. Claim correct when detritus input is high
3. Clasim correct for ecosystems dominated by phytoplankton
4. Claim wrong because energy pyramids are always upright
1. Claim correct
2. Claim correct when detritus input is high
3. Clasim correct for ecosystems dominated by phytoplankton
4. Claim wrong because energy pyramids are always upright
Subtopic: Ecological Pyramids |
64%
Level 2: 60%+
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In a grassland, two primary consumers feed on the same grass. Consumer X has lower biomass than Consumer Y, yet X receives more energy from producers per unit time. Which explanation BEST resolves this paradox?
1. X feeds more frequently or rapidly than Y
2. X occupies a higher tropic level
3. Y has higher assimilation efficiency
4. Energy pyramids can be inverted in grasslands
1. X feeds more frequently or rapidly than Y
2. X occupies a higher tropic level
3. Y has higher assimilation efficiency
4. Energy pyramids can be inverted in grasslands
Subtopic: Energy Flow |
Level 3: 35%-60%
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Q. No.
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