Question

${\mathrm{CO}}_2$ and ${\mathrm{O}}_2$ balance in atmosphere are due to______.

• A. Respiration
• B. Leaf anatomy
• C. Photosynthesis
• D. Photorespiration

Answer 1

The correct option is C

Photosynthesis

The explanation for the correct option:

(c) Photosynthesis-

• The process in which Carbon dioxide is taken by the green plants from the atmosphere to prepare their food and to release Oxygen gas in the atmosphere is called photosynthesis.

$6{\mathrm{CO}}_2\left(\mathrm{g}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\underset{\mathrm{Chlorophyll}}{\overset{\mathrm{Sunlight}}{\rightleftharpoons }}{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6\left(\mathrm{s}\right)+6{\mathrm{O}}_2\left(\mathrm{g}\right)$

• Carbon dioxide and Oxygen are balanced by the green plant as they take the carbon dioxide from the atmosphere and release the oxygen in the atmosphere by photosynthesis.

The explanation for the incorrect options:

(a) Respiration- The process in which food is chemically combined with Oxygen to form Carbon dioxide, water vapour, and energy is called respiration.

${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6\left(\mathrm{s}\right)+6{\mathrm{O}}_2\left(\mathrm{g}\right)\to 6{\mathrm{CO}}_2\left(\mathrm{s}\right)+6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+\mathrm{Energy}$

(b) Leaf anatomy- Leaves can be found in a variety of shapes and sizes. Most leaves are broad, flat, and typically green in colour.

(d) Photorespiration- This process decreases the efficiency of photosynthesis.

Hence, option (C) is correct as photosynthesis balances Carbon dioxide and Oxygen in the atmosphere.