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.

❤Kindly give short answers if possible ❤
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Answer 1

Answer:

1. Arteries are thick walled because they need much pressure to pump the blood throughout the body and thick walls provide that pressure.
2. Blood goes only once through the heart of fishes in one cycle because they have a two chambered heart . They take oxygen through gills where the blood is oxygenated and passed through the heart to the rest of the body.
3. Plants have low energy needs as compared to animals because they do not move. Moreover, in a large plant there are many dead cells like sclerenchyma because of which they also need less energy.

Answer 2

Answer:

1.Arteries are thick walled because they need much pressure to pump the blood throughout the body and thick walls provide that pressure.

2.Blood goes only once through the heart of fishes in one cycle because they have a two chambered heart . ...

3.Plants have low energy needs as compared to animals because they do not move