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CBSE Notes 2011-2012 » X-Science-Term2

Our Environment

Excessive exposure of humans to U V-rays results in (i) damage to immune system (ii) damage to lungs...

Multiple choice question

Excessive exposure of humans to U V-rays results in
(i) damage to immune system
(ii) damage to lungs
(iii) skin cancer (iv) peptic ulcer

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

In the garden ecosystem, which of the following are producers ?

Multiple choice question

In the garden ecosystem, which of the following are
producers ?

Which of the following groups contains only biodegradable items ?

Multiple choice question

Which of the following groups contains only biodegradable
items ?

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