Q. No.Which of the following representations shows the pyramid of numbers in a forest ecosystem?
1.
A
2.
B
3.
C
4.
D
Both, hydrarch and xerarch successions lead to:
1. Excessive wet conditions
2. Medium water conditions
3. Xeric conditions
4. Highly dry conditions
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Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?
1. Frog
2. Sparrow
3. Lion
4. Goat
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The breakdown of detritus into smaller particles by earthworm is a process called:
1. Catabolism
2. Humification
3. Fragmentation
4. Mineralisation
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The rate of formation of new organic matter by consumers is called as:
1. Gross primary productivity
2. Net primary productivity
3. Secondary productivity
4. Ecological efficiency
In the Hubbard Brook experiment, when the part of the forest was cut down
1. water flowed through the system at a greater rate
2. nitrogen began to accumulate in the system
3. more phosphorus was lost in stream runoff
4. carbon dioxide is released into the environment
The amount of water required for a crop plant to produce one kilogram of food is approximately:
1. 1 Kg
2. 10 Kg
3. 100 Kg
4. 1000 Kg
In boreal forests soils contain large amounts of carbon but the primary production is low compared to other types of forests. This can be explained by:
1. high rates of herbivory
2. slow weathering of rocks
3. periodic fires in the forests
4. restricted decomposition
In an ecosystem which of the following can never by inverted?
1. pyramid of numbers
2. pyramid of energy
3. pyramid of biomass
4. all can be inverted
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Assertion: The Amazon basin exhibits especially high productivity from roughly August through October - the period of the area's dry season.
Reason: Even in the tropics, there are variations in productivity over the course of the year.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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