Q98 of 367 Page 27

The first enzyme to mix with food in the digestive tract is :

Saliva is a watery fluid which contains an enzyme called salivary amylase. Salivary amylase acts on starch and breaks down it into sugar.

The opening and closing of the stomatal pores depends upon :

Most of the plants absorb nitrogen in one of the following forms. This is:

Options;

A. proteins

B. nitrates and nitrites

C. urea

D. atmospheric nitrogen

Which of the following is the correct statement ?

100

In which of the following groups of organisms the food material is broken down outside the body and then absorbed?