OUR ENVIRONMENT GROUP A & B

Flow of energy in an ecosystem is always

• unidirectional

• bidirectional

• multidirectional

• none of these

Which of the following is non-biodegradable?

• Tea leaves

• Nylon

• remains of animals

• fleece of sheep

The structural and functional unit of the environment is known as:

• ecosystem

• biosphere

Which of the following is an abiotic component

• plants

• animals

• soil

• microorganisms

Which one of the following is a non-biodegradable substance

• DDT

• Manure

• Paper

• Cotton cloth

In a terrestrial ecosystem the biomass of ___________ should be the most

Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as

• eutrophication

• pollution

• biomagnification

• accumulation

Flow of energy in an ecosystem is always

• unidirectional

• bidirectional

• multi directional

• no specific direction

Excessive exposure of humans to UV rays results in

• (i) damage to immune system

• (ii) damage to lungs

• (iii) skin cancer

• (iv) peptic ulcers

What will happen if deer is missing in the food chain given below? Grass → Deer → Tiger

• The population of tiger increases

• The population of grass decreases

• Tiger will start eating grass

• The population of tiger decreases and the population of grass increases