Tamil Nadu Board 12th Standard Bio-Zoology - Chapter 8: Book Back Answers and Solutions
This post covers the book back answers and solutions for Chapter 8 – Bio-Zoology from the Tamil Nadu State Board 12th Standard Bio-Zoology textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.
We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.
By going through this material, you’ll gain a strong understanding of Bio-Zoology Chapter 8 along with the corresponding book back questions and answers (PDF format).
Question Types Covered:
- 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
- 2 Mark Questions: Answer briefly
- 3, 4, and 5 Mark Questions: Answer in detail
All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.
All the best, Class 12 students! Prepare well and aim for top scores. Thank you!
Chapter 8: Microbes in Human Welfare
I. Multiple Choice Questions
a) Lactobacillus bulgaris
b) Penicillium citrinum
c) Aspergillus niger
d) Rhizopus nigricans
Answer Key:
c) Aspergillus niger
2. Which of the following pair is correctly matched for the product produced by them?
a) Acetobacter aceti - Antibiotics
b) Methanobacterium - Lactic acid
c) Penicilium notatum - Acetic acid
d) Saccharomyces cerevisiae – Ethanol
Answer Key:
d) Saccharomyces cerevisiae – Ethanol
3. The most common substrate used in distilleries for the production of ethanol is_________
a) Soyameal
b) Groundgram
c) Molasses
d) Corn meal
Answer Key:
c) Molasses
4. Cyclosporin – A is an immunosuppressive drug produced from _______
a) Aspergillus niger
b) Manascus purpureus
c) Penicillium notatum
d) Trichoderma polysporum
Answer Key:
d) Trichoderma polysporum
5. CO2 is not released during
a) Alcoholic fermentation
b) Lactate fermentation
c) Aerobic respiration in animals
d) Aerobic respiration in plants
Answer Key:
b) Lactate fermentation
6. The purpose of biological treatment of waste water is to _______
a) Reduce BOD
b) Increase BOD
c) Reduce sedimentation
d) Increase sedimentation
Answer Key:
a) Reduce BOD
7. The gases produced in anaerobic sludge digesters are
a) Methane, oxygen and hydrogen sulphide.
b) Hydrogen sulphide, methane and sulphur dioxide.
c) Hydrogen sulphide, nitrogen and methane.
d) Methane, hydrogen sulphide and CO2.
Answer Key:
d) Methane, hydrogen sulphide and CO2.
II. Short answer questions
12th bio zoolgy III. Long answer questions
12th bio zology
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