Excretion Meaning
Excretion Meaning
Chemical reactions occur in the cells of living organisms all the time to carry out the life processes. The sum of these reactions is called metabolism. Metabolism produces useful products as well as toxic (poisonous) by-products. These toxic substances have to be removed as they are harmful if allowed to accumulate. The removal of metabolic waste products from the body of an organism is known as excretion. The major excretory products are carbon dioxide, excess water, and nitrogenous compounds like ammonia, urea, uric acid, etc.
Carbon dioxide and water are produced in the process of tissue respiration. Nitrogenous compounds are formed from the breakdown of proteins and amino acids. Water and salts in excess of the body’s needs are also excreted. We acquire most of the water with our food and drink and some by metabolism, e.g., the water produced during cellular respiration. Other excretory products include chemicals from medicines, toxic substances, and circulating hormones that have already served their purpose.
Which of the following are correct ? (a) Metabolism produces useful products as well as toxic (poisonous) by-products. (b) The removal of metabolic waste products from the body of an organism is known as excretion . (c) The major excretory products are carbon dioxide, excess water, and nitrogenous compounds like ammonia, urea, uric acid, etc. | |||
| Right Option : D | |||
| View Explanation | |||
The process by which metabolic waste products are eliminated from the body is called ______________ | |||
| Right Option : A | |||
| View Explanation | |||
In plants it occur through special kind of cells called as ____________________. | |||
| Right Option : A | |||
| View Explanation | |||
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