Question

(a) Why do aquatic animals have a faster rate of breathing as compared to terrestrial animals ?
(b) Name the enzyme present in saliva and state its function.


CBSE Class X Science SA 2 (3 Marks)

Answer 1

(a)Most of the aquatic animal which live in water require oxygen for respiration.
The solubility of oxygen in water is much lower
So, the amount of oxygen available is less than air
hence the rate of breathing is faster in aquatic animals.

(b)The enzyme salivary amylase is present in saliva.
It breaks down starch into a simple sugar maltose.

Answer 2

(a) Since, Oxygen is less soluble in Water Aquatic animals doesn't get adequate amount of oxygen dissolved in water therefore it increases its breathing rate to fulfil its oxygen requirements
(b) It contains Ptyalin & Amylase which catabolizes Starch into simple sugars present in food