Give reasons for the following statement.
The heart acts as a pump.
Heart:
Which of these is the correct structural design of a heart to act as a pump?
A heart has some special structural design to act as a pump. It has ____ which contracts and relaxes rhythmically to produce pump-like action.
Give reasons for the following statements. Chloroplast is known as the kitchen of the cell.
Give scientific reasons for the following statements:
The left ventricle of the heart has a thicker wall than the right ventricle.