Chapter Exam

Chapter-16 Microorganisms — Online MCQ Test

Q: Which of the following microorganisms is used in making curd?

Answer: A. Bacteria — Lactobacillus, a bacterium, converts milk into curd by producing lactic acid.

Q: Which microorganism is commonly used in baking bread?

Answer: B. Yeast — Yeast is a fungus used in baking because it releases carbon dioxide and makes the dough rise.

Q: Which of the following is NOT a microorganism?

Answer: D. Mango tree — A mango tree is a plant and not a microorganism. Microorganisms are too small to be seen without a microscope.

Q: Which statement best explains why fungi are useful in medicine?

Answer: B. Some fungi produce antibiotics like penicillin — Certain fungi, such as Penicillium, are used to produce antibiotics that kill harmful bacteria.

SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-16 Microorganisms with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE. This chapter covers: bacteria fungi virus Covers useful and harmful microorganisms in daily life. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-16 Microorganisms — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE — Chapter-16 Microorganisms, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following microorganisms is used in making curd?

A. Bacteria ✓
B. Virus
C. Protozoa
D. Algae

Answer: A. Bacteria
Lactobacillus, a bacterium, converts milk into curd by producing lactic acid.

Which microorganism is commonly used in baking bread?

A. Rhizobium
B. Yeast ✓
C. Amoeba
D. Plasmodium

Answer: B. Yeast
Yeast is a fungus used in baking because it releases carbon dioxide and makes the dough rise.

Which of the following is NOT a microorganism?

A. Bacteria
B. Fungi
C. Virus
D. Mango tree ✓

Answer: D. Mango tree
A mango tree is a plant and not a microorganism. Microorganisms are too small to be seen without a microscope.

Which statement best explains why fungi are useful in medicine?

A. They produce vaccines naturally
B. Some fungi produce antibiotics like penicillin ✓
C. They convert milk into curd
D. They fix nitrogen in soil

Answer: B. Some fungi produce antibiotics like penicillin
Certain fungi, such as Penicillium, are used to produce antibiotics that kill harmful bacteria.

Which of the following is the most appropriate reason for adding yeast to dough with sugar and warm water?

A. To make the dough acidic and hard
B. To stop microbial growth completely
C. To produce carbon dioxide that makes the dough rise ✓
D. To convert flour into curd

Answer: C. To produce carbon dioxide that makes the dough rise
Yeast ferments sugar and releases carbon dioxide, which causes the dough to expand and rise.

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