Chapter Exam

Unit 6 Chapter 13: Microbes in Human Welfare — Online MCQ Test

Q: Which microorganism is used in the production of curd from milk?

Answer: A. Lactobacillus — Lactobacillus converts milk sugar into lactic acid, which helps in curd formation. It is a common beneficial bacterium used in household food preparation.

Q: Which of the following is used in the production of bread and alcoholic beverages?

Answer: B. Yeast — Yeast, especially Saccharomyces cerevisiae, carries out fermentation and is used in baking and brewing. It produces carbon dioxide and alcohol during the process.

Q: In sewage treatment, the primary role of aerobic bacteria is to

Answer: B. reduce organic matter and BOD — Aerobic bacteria decompose organic waste in the sewage and reduce the biochemical oxygen demand (BOD). This makes the water less polluting.

Q: In a sewage treatment plant, the flocs formed are mainly due to the activity of

Answer: A. Bacterial masses and fungal hyphae — Flocs are masses of bacteria associated with fungal filaments that help in decomposition of organic matter. These are central to secondary treatment of sewage.

Q: Which of the following pairs is correctly matched?

Answer: B. Azotobacter — nitrogen fixation — Azotobacter is a free-living nitrogen-fixing bacterium used as a biofertilizer. The other options are incorrect matches of microbe and function.

BOTANY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 6 Chapter 13: Microbes in Human Welfare with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR BOTANY. This chapter covers: The final chapter examines beneficial roles of microorganisms in household products industrial production sewage treatment biogas generation biocontrol agents and biofertilizer app.... AI-generated questions from basic to board-exam level, with instant results and explanations.

Questions

20m

Time Limit

Attempts Left

10 random questions from this chapter (mixed difficulty)
Questions you've seen before won't repeat until the pool resets
You have 20 minutes — exam auto-submits when time is up
Maximum 3 attempts per chapter
Results and explanations shown immediately after submission

New here? Register free — includes 3 free chapter exams.

Unit 6 Chapter 13: Microbes in Human Welfare — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR BOTANY — Unit 6 Chapter 13: Microbes in Human Welfare, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which microorganism is used in the production of curd from milk?

A. Lactobacillus ✓
B. Rhizobium
C. Aspergillus
D. Penicillium

Answer: A. Lactobacillus
Lactobacillus converts milk sugar into lactic acid, which helps in curd formation. It is a common beneficial bacterium used in household food preparation.

Which of the following is used in the production of bread and alcoholic beverages?

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

Answer: B. Yeast
Yeast, especially Saccharomyces cerevisiae, carries out fermentation and is used in baking and brewing. It produces carbon dioxide and alcohol during the process.

In sewage treatment, the primary role of aerobic bacteria is to

A. increase the amount of toxic gases
B. reduce organic matter and BOD ✓
C. produce curd
D. fix atmospheric nitrogen

Answer: B. reduce organic matter and BOD
Aerobic bacteria decompose organic waste in the sewage and reduce the biochemical oxygen demand (BOD). This makes the water less polluting.

In a sewage treatment plant, the flocs formed are mainly due to the activity of

A. Bacterial masses and fungal hyphae ✓
B. Only algae
C. Only viruses
D. Only protozoa

Answer: A. Bacterial masses and fungal hyphae
Flocs are masses of bacteria associated with fungal filaments that help in decomposition of organic matter. These are central to secondary treatment of sewage.

Which of the following pairs is correctly matched?

A. Rhizobium — phosphate solubilization
B. Azotobacter — nitrogen fixation ✓
C. Bacillus thuringiensis — curd formation
D. Aspergillus niger — biogas production

Answer: B. Azotobacter — nitrogen fixation
Azotobacter is a free-living nitrogen-fixing bacterium used as a biofertilizer. The other options are incorrect matches of microbe and function.