Secondary producers are

Which of the following represents the sedimentary type of nutrient cycle?

Which of the following is a free living nitrogen fixing bacteria present in soil?

Maximum absorption of rainfall water is done by 

Given is one of the types of ecological pyramids. This type represents

Distinguish between food chain and food web.

Distinguish between primary and secondary productivity.

Mention the uses of phosphorus in living organisms.

Who attempted to put a price tag on ecosystem services?What is the estimated value?

What are functions of ecosystem?

Describe the different classes of consumers.

What is humus?Mention its properties.

Why are green algae not likely to be found in the deepest strata of the ocean?

Why do decomposers not given any fixed trophic level in an ecosystem?

Describe the role of living organisms in the cycle .

Describe a pond as an ecosystem.

Write the importance of species diversity to the Ecosystem. Support your answer with the findings of Tilman.

It was obserbed by a team of research workers the population of fish eating birds is declining gradually year after year after the nearby establishment of a pesticide producing factory a few years ago. Answer the following on the basis of above information.
(i) What may be the possible cause of the declining population of the fish eating birds, in your opinion?
(ii) What may be the alternative to the pesticide.