Question

6.
E. Answer the following questions.
Why do we get muscle cramps after heavy excercise?
Why does a potted plant die when over watered?
1.
2.
3.
4.
Where are stomata found in a plant? State their function.
How is oxygen transported from lungs to the other parts of the body?
Draw a neat, well-labelled diagram of the human respiratory system.
5.
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Answer 1

Answer:

Why do we get muscle cramp after heavy exercise ???

Ans :- Because of lack of oxygen supply we get muscle cramp during heavy exercise

Answer 2

Explanation:

Roots growing in waterlogged soil may die because they cannot absorb the oxygen needed to function normally. The longer the air is cut off, the greater the root damage. The dying roots decay and cannot supply the plants with nutrients and water. Damage caused by over watering is frequently misdiagnosed as pest damage.

Excretion

Excretion is the removal of the following substances:

toxic materials

waste products of metabolism

excess substances from organisms

Excretion is not the same as egestion - which is the passing out of undigested food through the anus as faeces.

Plants

Plants need to excrete excess carbon dioxide and oxygen. Carbon dioxide is a waste product of aerobic respiration in plant cells. Oxygen is a waste product of photosynthesis.

The leaf

Unlike animals, plants do not have specialised excretory organs. Excess carbon dioxide and oxygen are excreted from the plant through the stomata in the leaves.