Excretion Meaning
Excretion Meaning
Excretion : Excretion is a life process which involves removal of the waste material from our body. Excretory products are produced as a by product of metabolic and non metabolic activities. Excretion also occurs in plants. Water and oxygen they release during the process of photosynthesis are the waste by products of photosynthesis. Unicellular organisms also release waste in the form of nitrogen and sulphur gas which are not useful for them.
Excretory System :
An excretory system consists of different parts in different organisms. In unicellular organisms like Ameoba excretion occur by the process of phagocytosis. In plants it occur through special kind of cells called as stomata.
In invertebrates like earthworm nephridia are the main excretory organ. Higher organisms like fish, birds, reptiles and mammals have more complex systems for excretion. In Humans the excretory system consists kidneys, urethra, ureters and urinary bladder.
The organ system responsible for the removal of wastes is called _________________ . | |||
| Right Option : A | |||
| View Explanation | |||
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 | |||
Which of the following are correct ? (a) The process of removal of wastes from the cells of living organisms is called excretion . (b) The organ system responsible for the removal of wastes is called excretory system . | |||
| Right Option : C | |||
| View Explanation | |||
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