Green plants constitute

•  first trophic level

• second trophic level

• third trophic level

• complete food chain

The effect of intraspecific competition on niches is to make them

• smaller

• larger

• change location

• more triangular

If decomposers are removed what will happen to the ecosystem?

• Energy cycle is stopped

• Mineral cycle is stopped

• Consumers cannot absorb solar energy

• Rate of decompostion of mineral increases

Which of the following is used as green manure?

• Azolla

• Azadirachta

• Crotolaria juncea

• Hevea brassiliansis

Increase in toxic concentration from one trophic level to another trophic level is called

• ecological toxification

• bio- magnification

• bioconcentration

• cytological effect

Which of the following workers are related as ecologist, palaeobotanist and embryologist respectively?

• B. Salmi, R. Mishra, P. Maheshwari

• R Mishra, B. Sahni, P. Maheshwari

• B. Sahni, P. Maheshwari, R Mishra

• P. Maheshwari, R Mishra, B. Sahni

In terrestrial ecosystem such as forest, maximum energy is found in which trophic level

• T₁

• T₂

• T₃

• T₄

The part of earth in which life exist is known as

• Lithosphere

• Biosphere

• Atmosphere

• Hydrosphere

169.

The water logging capacity of garden soil will be determined by measuring the weight of

• soil by adding water and humus

• water saturated soil then heating the soil till it is dry and then measuring the weight of soil

• soil by adding water, biomass and humus

• soil from different locations with biomass.

Enzyme and carbohydrates dominate in the digestive tract of

• carnivores

• omnivores

• parasites

• herbivores