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CBSE Notes 2011-2012 » X-Science-Term2

Our Environment

A : Decomposers get their energy directly from autotrophs. B : Photosynthesis fix up the solar energ...

Multiple choice question

A : Decomposers get their energy directly from autotrophs.
B : Photosynthesis fix up the solar energy and make it
available in a food chain.

A : Decrease in predator population will decrease the preypopulation. B : Ozone layer presents harmf...

Multiple choice question

A : Decrease in predator population will decrease the preypopulation.
B : Ozone layer presents harmful infrared radiation.

Assertion (A) :The Ozone layer in the atmosphere is getting depleted allowing more UV rays to reach ...

Multiple choice question

Assertion (A) :The Ozone layer in the atmosphere is
getting depleted allowing more UV rays
to reach earth.
Reason (R) :CFC is broken down by UV radiation
resulting attack on the Ozone molecules'
damaging the Ozone umbrella of earth.

Energv pyramids of an ecosystem lend to diminish at higher trophic levels. This is because at each s...

Multiple choice question

Energv pyramids of an ecosystem lend to diminish at higher
trophic levels. This is because at each successive level

The difference between biodegradable and nonbiodegradable substances is

Multiple choice question

The difference between biodegradable and nonbiodegradable
substances is

On an average energy transferred from one trophic level to another is

Multiple choice question

On an average energy transferred from one trophic level to
another is

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