The Invisible Living World Beyond Our Naked Eye Class 8 Assertion and Reason Questions

The Invisible Living World Beyond Our Naked Eye Class 8 Assertion and Reason Questions

The Invisible Living World Beyond Our Naked Eye Class 8 Assertion and Reason Questions

Following questions are of Assertion (A), Reason (R) type questions. Choose the correct answer from the following options :

(a) Both A and R are true, and R is the correct explanation of A.

(b) Both A and R are true, but R is not the correct explanation of A.

(c) A is true, but R is false.

(d) A is false, but R is true.

1. (A): Yeast is a type of microorganism that belongs to the group of fungi.

(R): Yeast is used in the fermentation process to make bread and cakes rise.

Answer:

(a) Both A and R are true, and R is the correct explanation of A.

2. (A): Microorganisms can thrive in extreme environments, including inside the human gut.

(R): Microorganisms require specific conditions such as temperature, air, and moisture for growth.

Answer:

(b) Both A and R are true, but R is not the correct explanation of A.

3. (A): The dough without yeast will rise just as much as the dough with yeast when left in a warm place.

(R): Yeast is necessary for the fermentation process to occur in dough.

Answer:

(d) A is false, but R is true.

4. (A): Curd becomes sour when left out for a day due to the action of microorganisms.

(R): The temperature of the environment affects the rate of fermentation and souring of curd.

Answer:

(a) Both A and R are true, and R is the correct explanation of A.

5. (A): The use of a magnifying glass allows us to see microorganisms that are otherwise invisible to the naked eye.

(R): A magnifying glass works by bending light to enlarge the image of an object.

Answer:

(a) Both A and R are true, and R is the correct explanation of A.