Question

All living plants and animals need _______ for their growth as it is an important constituent of proteins.

Answer 1

Proteins are one of the most important components required by the body. They help in maintaining muscles, repairing old or wounded tissues of the body. They constitute a big portion of a healthy diet.

Complete Answer
All living plants and animals need Nitrogen for their growth as it is an important constituent of proteins. Following are a few of the important functions of proteins:
I. Nitrogen in the form of amino acids maintains body muscles, DNA structures, and
enzymatic activities of the body.
II. Nitrogen invokes proper growth of the body in animals and maintenance of stems and leaves in plant body
III. Nitrogen ensures proper development of fruits and flowers in the plant body. Its deficiency can cause malnourished flowers or fruits.
IV. Nitrogen is important for maintaining chlorophyll of leaves. Lack of nitrogen turns leaves yellowish in colour.
Nitrogen reserves a huge proportion of atmosphere. Though it comes under the basic requirements of both plant and animal life cycles yet is able to maintain its quantity due to the fact that it keeps on circulating between plants and animals. Animals' bodies have nitrogen in the form of amino acids. The dead remains, excretory products of animals, consist of nitrogen that gets restored in the atmosphere by the action of atmospheric bacterias. whereas plants further use this nitrogen either from the atmosphere or from soil.
Thus, creating a complete cycle of usage and restoration of Nitrogen.

Note:
Proteins being responsible for maintenance of body structure and muscles are required by the body in large amounts. As it consists of Nitrogen as one of the chief components therefore Nitrogen also becomes a vital requirement of our body. Besides animals, Nitrogen is also a chief requirement of plants.