A lump of cotton shrinks in water because:

Question

Options:

A . Air present in lump of cotton is replaced by water which occupies less space.

B . There are tiny spaces occupied by air in cotton lump. When placed in water, these spaces get closed.

C . Water cleans the cotton lump, making it shrink in size.

D . Water pushes the cotton lump from all directions, making it shrink in size.

Answer: Option A
:
A
A lump of cotton is porous, it has air in it. When it is dipped in water, water removes air and occupies the space. Space occupied by water is less than that occupied by air.

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