Question

. Give reason :
(1) Deep – sea divers wear special suits.
(2) Tin electroplated on iron to make cans used for storing food.
(3) Plants have additional layer surrounding the cell membrane.
(4) It is easier to push a nail in a wooden plank through its pointed end.
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Answer 1

Answer:

1 because of the pressure down in the ocean

2 Tin is a non-reactive metal whereas iron is a reactive metal. If food is stored in an iron container, it might react with iron and get spoiled. Hence, tin is electroplated on iron to make cans used for storing food.

3 Plants are immobile and hence, need protection against variations in temperature, high wind speed, atmospheric moisture, etc. ... Therefore, a stiff outer covering is present in plant cells which protects and gives shape and rigidity to the cell. This additional layer is called the cell wall. It is made of cellulose

4 .

It is easy to push a nail into a wooden plank by pointed end because the smaller the area, larger the pressure on a surface for the same force.

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