Question

Q. Give reasons for the following:

(a) Arteries are thick walled.

(b) Blood goes only once in one cycle through the heart in fishes.

(c) Plants have low energy needs.

Answer 1

1) Artery are very thik walled because, the pressure of blood inside is high.

2) Blood only goes one cycle in heart of fish because, the fish doesn't required double circulation like hummans..

3) plants have low energy requirement because, plant doesn't move or it doest have digestion etc process like hummans have..they only satisfied their reqenment by photosynthesis...

I HOPE YOU GET IT