12th Botany - Book Back Answers - Chapter 7 - English Medium Guides

 

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Tamil Nadu Board 12th Standard Botany - Chapter 7: Book Back Answers and Solutions

    This post covers the book back answers and solutions for Chapter 7 – Botany from the Tamil Nadu State Board 12th Standard Botany 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 Botany Chapter 7 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!

Unit 7 - Ecosystem

I. Multiple Choice Questions

1. Which of the following is not a abiotic component of the ecosystem? 
a) Bacteria 
b) Humus 
c) Organic compounds 
d) Inorganic compounds
Answer Key:
a) Bacteria 
 
2. Which of the following is / are not a natural ecosystem? 
a) Forest ecosystem 
b) Rice field 
c) Grassland ecosystem 
d) Desert ecosystem 
Answer Key:
b) Rice field 

3. Pond is a type of 
a) forest ecosystem
b) grassland ecosystem 
c) marine ecosystem 
d) fresh water ecosystem 
Answer Key:
d) fresh water ecosystem 

4. Pond ecosystem is 
a) not self sufficient and self regulating 
b) partially self sufficient and self regulating 
c) self sufficient and not self regulating 
d) self sufficient and self regulating 
Answer Key:
d) self sufficient and self regulating 

5. Profundal zone is predominated by heterotrophs in a pond ecosystem, because of 
a) with effective light penetration 
b) no effective light penetration 
c) complete absence of light 
d) a and b 
Answer Key:
b) no effective light penetration 

6. Solar energy used by green plants for photosynthesis is only 
a) 2 – 8% 
b) 2 – 10% 
c) 3 – 10% 
d) 2 – 9% 
Answer Key:
b) 2 – 10% 

7. Which of the following ecosystem has the highest primary productivity? 
a) Pond ecosystem 
b) Lake ecosystem 
c) Grassland ecosystem 
d) Forest ecosystem 
Answer Key:
d) Forest ecosystem 

8. Ecosystem consists of 
a) decomposers 
b) producers 
c) consumers 
d) all of the above
Answer Key:
d) all of the above
 
9. Which one is in descending order of a food chain 
a) Producers → Secondary consumers → Primary consumers → Tertiary consumers 
b) Tertiary consumers → Primary consumers → Secondary consumers → Producers 
c) Tertiary consumers → Secondary consumers → Primary consumers → Producers 
d) Tertiary consumers → Producers → Primary consumers → Secondary consumers 
Answer Key:
c) Tertiary consumers → Secondary consumers → Primary consumers → Producers 

10. Significance of food web is / are
a) it does not maintain stability in nature 
b) it shows patterns of energy transfer 
c) it explains species interaction 
d) b and c
Answer Key:
d) b and c
 
11. The following diagram represents 

 a) pyramid of number in a grassland ecosystem 
b) pyramid of number in a pond ecosystem 
c) pyramid of number in a forest ecosystem 
d) pyramid of biomass in a pond ecosystem 
Answer Key:
c) pyramid of number in a forest ecosystem 

12. Which of the following is / are not the mechanism of decomposition 
a) Eluviation 
b) Catabolism 
c) Anabolism 
d) Fragmentation 
Answer Key:
c) Anabolism 

13. Which of the following is not a sedimentary cycle 
a) Nitrogen cycle 
b) Phosphorous cycle 
c) Sulphur cycle 
d) Calcium cycle 
Answer Key:
a) Nitrogen cycle

14. Which of the following are not regulating services of ecosystem services 
i) Genetic resources 
ii) Recreation and aesthetic values 
iii) Invasion resistance 
iv) Climatic regulation 
a) i and iii 
b) ii and iv 
c) i and ii 
d) i and iv 
Answer Key:
c) i and ii 

 

 

II. Short Answer Questions

12th bio botany

III. Long Answer Questions

12th bio botany

IV. Exercise

12thbio botany