IGCSE Biology Paper-1: Specimen Questions with Answers 83 - 84 of 109

Question number: 83

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Question

The ………………………. . System is a passive biological system that removes excess, unnecessary materials from the body fluids of an organism, so as to help maintain internal chemical homeostasis and prevent damage to the body.

Choices

Choice (4) Response

a.

Excretory system

b.

Growth and development

c.

Respiratory system

d.

Reproductive system

Answer

a.

Explanation

The excretory system is very important to body. Removing solid waste from body is called excretory system. This system Maintain volume of extracellular fluid, Maintain ionic balance in extracellular fluid, Maintain pH. Excrete toxic by-products such as urea, ammonia, and uric acid.

Question number: 84

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Question

Ram set two pots. he put a plant in pot A and pot B is without plant. Both pot have a layer of oil on their surface. Then he left both pots for a week. After one week observation will be- (volume of water at the start of the experiment in both pot-100ml)

shows two type of pot one has a plant and other iswithout plant

Shows Two Type of Pot One Has a Plant and Other Iswithout Plant

Image shows two type of pot one has a plant and other is without plant. Measure the water level in both containers

Choices

Choice (4) Response

a.

Volume of water at the end of the experiment in pot A will increase and in B will decrease

b.

Volume of water at the end of the experiment in pot A will remain same and in B will decrease

c.

Volume of water at the end of the experiment in pot A will decrease and in B will remain same

d.

Volume of water at the end of the experiment in pot A will decrease and in B will increase

Answer

c.

Explanation

In pot A roots of that plant absorb the water for the plant so water level will decrease in pot A and there is no plant in pot B so water level will remain unchanged. This experiment prove that plant take water.