Question

Fill in the blanks with appropriate words.
(a) The atmosphere isheld in its place due to the
of the earth.
(b) Weather phenomena take place in the
(c) The layer of the atmosphere which is considered safe to fly aeroplanes is
layer saves us from harmful ultraviolet rays.
reflects radio waves back to the earth.
(d) The
(e) The
(iv) nitrogen.
(iv) stratosphere.
Choose the correct answer.
(a) This is the gas that facilitates photosynthesis:
(i) hydrogen.
(ii) carbon dioxide. (iii) ozone.
(b) The lowest layer of the atmosphere is the
(i) thermosphere. (ii) ionosphere. (iii) troposphere.
(c) The ozone layer exists in the
(i) troposphere. (ii) stratosphere (iii) mesosphere
d) Meteors burn out due to friction of the atmosphere in this
(i) exosphere. (ii) mesosphere (iii) ionosphere.
e) Temperature increases rapidly in the
(i) mesosphere. (ii) stratosphere. (iii) thermosphere.
(iv) thermospher
(iv) troposphere
(iv) exosphere
zmembering and Understanding Skills​

Answer 1

2] 1. carbon dioxide

2. Troposphere

3. Stratosphere

4. mesosphere

5. Thermosphere