Question

The phenomenon of removing of waste product from the body is known as
a. Photosynthesis
b. Perspiration
c. Metabolism
d. Excretion

Answer 1

Every organism needs to remove waste products to maintain itself. Different organisms follow different ways for removing their waste. Our human body is complex, it contains many waste products such as gases $(CO_2)$, unwanted liquids, and food waste, etc. So, it has a specialized system for it.

Complete answer:
- Photosynthesis is the process by which green plants, algae and certain other organisms convert light energy into chemical energy.
- During the process of photosynthesis, green plants absorb carbon dioxide in the presence of light and convert them to glucose by the reaction with water having the by-product Oxygen, which is subsequently released into the atmosphere.
- Perspiration is the process by which the water is given off by the skin as vapour (evaporation) or as sweat( liquid) from the sweat glands.
- Metabolism is a complex process of all the chemical reactions involved in maintaining the living state of the cells of an organism. It can be divided into two categories such as catabolism and anabolism.
- The phenomenon of removing waste products from the body is known as Excretion.Humans excrete mostly urea as the excretory waste.
- If the excretion mechanism does not happen properly, the other organs slowly stop their functions.
- Other phenomena like metabolism, perspiration, and photosynthesis do not remove the waste from the body.

Hence, the correct answer is option (D).

Note: Parts associated with the excretory system of humans are:
- Kidney: it removes the unwanted liquids and salt from the blood, and converts into urea.
- Ureters: it supplies urine (the fluid waste) from kidney to the urinary bladder.
- Urinary Bladder: it acts as a carrier of urine.
- Urethra: it is the tube which helps to expel urine from the body.