Practicing Success

Target Exam

CUET

Subject

Biology

Chapter

Microbes in Human Welfare

Question:

Assertion: The kneaded flour shows leavening, when yeast is added to it.
Reason: Enzymes secreted by yeast cause leavening.

Options:

Both Assertion (A) and Reason (R) are correct and R is the correct explanation of A.

Both Assertion (A) and Reasoning (R) are correct  but R is not the correct explanation of A.

Assertion (A) is true but Reason(R) is not correct.

Both Assertion (A) and Reason are false (F ).

Correct Answer:

Both Assertion (A) and Reason (R) are correct and R is the correct explanation of A.

Explanation:

A small quantity of yeast is added to wheat flour and is kneaded. The kneaded flour is kept at a warm temperature for few hours. It swell up. This phenomenon is called leavening. Leavening is caused by secretion of three types of enzymes by yeast. These are amylase, maltase and zymase.