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 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

Assertion: Grasslands do not accumulate as much biomass as forests.
Reason: Grasses and herbs have inefficient photosynthesis as compared to the tall trees.

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

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

Which pair is mismatched  
1. Tundra –Permafrost
2. Savanna – Acacia trees
3. Prairie–Epiphytes
4. Coniferous forest – Evergreen trees

Which of the following representations shows the pyramid of numbers in a forest ecosystem?

The upright pyramid of number is absent in      
1. Pond
2. Forest
3. Lake
4. Grassland

Great Barrier Reef along east coast of Australia is a
1. Population
2. Community
3. Biome
4. Ecosystem

Assertion: Ecosystems with intermediate levels of productivity tend to have the most species.
Reason: The relationship between productivity and species richness is not linear.

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

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