Question

SCIENCE OLYMPIAD
1. Decomposition of
hydrogen: 9. How does photosynthesis help
peroxide to water and oxygen is a
to maintain the percentage of
Chemical
oxygen and carbon dioxide in the
(a) Reversible change
atmosphere?
(b) Physical change
(a) By giving off carbon dioxide
(c) Chemical change
and absorbing oxygen
(d) None of these
(b) By giving off oxygen and
2. Which of the following is/are
absorbing carbon dioxide
(c) By absorbing oxygen and
essential for photosynthesis?
carbon dioxide
(a) Water (b) Air
(d) By releasing oxygen and
(c) Sunlight (d) All of these
carbon dioxide​

Answer 1

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