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

The accompanying figure represents an ecological pyramid. It is

In primary succession in water, the pioneers are normally:
1. Lichens
2. Mosses
3. Phytoplankton
4. Submerged rooted plants

What is common to Pantoeaagglomerans, Microbacteriumlaevaniformans and Pseudomonas putida?
1. They are phosphate solubilising bacteria
2. They are all denitrifiers
3. They are genetically modified to fix atmospheric nitrogen
4. They are source of antibiotics effective against MRSA

Aquatic ecosystems that are most adversely affected by acid are those that lack:
1. calcium
2. carbonic acid
3. nitrate
4. bicarbonate

Assertion: If decomposition stopped, life would cease.
Reason: Detritus would pile up and the ingredients needed to synthesize organic matter would be exhausted.

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: 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

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

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