Which of the following is the smallest unit?

A. Biosphere
B. Ecosphere
C. Ecosystem
D. Biome

Which of the following belong to the same trophic level?

A. Yeast and Monotropa
B. Rhizopus and Riccia
C. Ulothrix and Yeast
D. All of these

Food levels in an ecosystem are called:

A. Trophic levels
B. Consumer levels
C. Producer levels
D. Herbivores levels

The pyramid of numbers in a grassland ecosystem will be:

A. Linear
B. Upright
C. Irregular
D. Inverted

The earth’s atmosphere in which organisms live, is called:

A. Ecosystem
B. Ectosome
C. Biosphere
D. Bioeconomic

Mr. X is eating curd/yoghurt. For this food intake in a food chain he should be considered as occupying:

A. First trophic level
B. Second trophic level
C. Third trophic level
D. Fourth trophic level

Source of energy in an ecosystem is:

A. Sun
B. ATP
C. Sugar made by plant
D. Green plant

Causes of accelerated erosion are:

A. Removal of the natural vegetation cover
B. Cultivation of land by crops which expose the soil to direct rain impact and runoff water
C. Both (a) & (b)
D. None of these

The number of kinds of food chains:

A. One
B. Two
C. Three
D. Four

The earth could have sustained more population if all the people would have been:

A. Pure vegetarians
B. Milk drinker and vegetarian
C. Non-vegetarians
D. Dependent upon milk, egg and vegetarian habit