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SAI International School
Subject- Biology, Class-VIII
Topic- Microorganisms: Friend and Foe
Subtopic- Friendly Microorganisms II- Cleaning Environment
Module-13

Home Assignment-II (Worksheet-1)

Q1. Which of the following is used for setting curd?
(a)Lactobacillus
(b)Yeast
(c)Bread mould
(d)Amoeba
Q2. Which of the following is used for making cheese?
(a)Fungi
(b)Protozoa
(c)Bacteria
(d)Algae

Q3. Which of the following helps to improve fertility of soil?
(a)Rhizobium
(b)Yeast
(c)Amoeba
(d)Paramecium

Q4. Assertion (A):Curd is an ingredient for making batter of idli.
Reason (R): Curd contains microorganisms.
(a) If both Assertion and Reason are correct and Reason is the correct
explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct
explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.
.
Q5. Assertion (A): Yeast is used for making vinegar.
Reason (R): Yeast produces carbon dioxide by anaerobic respiration.
(a) If both Assertion and Reason are correct and Reason is the correct
explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct
explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.

Q6. How are viruses different from other microorganisms?