The more abundant animals in a desert grassland are

Assertion: In a food chain members of successive higher levels are fewer in number.

Reason: Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.

Assertion: Tropical rain forests are disappearing fast from developing countries such as India.

Reason: No value is attached to these forests because these are poor in biodiversity.

Which of the following is an example of man-made ecosystem?

Animals living at the bottom of the sea are known as

The food chain, in which the microorganisms breakdown the energy-rich organic compounds prepared by the producers, is known as

Biotic factors refer to

Microbes that break down the complex organic matter into simple substances like carbon, nitrogen, water etc. are

The 10% law for energy transfer in food chains was given by

Which one of the following statements is correct for secondary succession?