Chapter Exam

Chapter 10: Economically Useful Plants and Entrepreneurial Botany — Online MCQ Test

Q: Which of the following plants is widely used in Tamil Nadu traditional medicine for treating jaundice and has the botanical name Phyllanthus amarus?

Answer: B. Keelanelli — Phyllanthus amarus (Keelanelli) is a well-known medicinal herb traditionally used in Tamil Nadu for treating jaundice and other liver-related ailments.

Q: Which of the following fibers is obtained from the outer husk of the coconut fruit (Cocos nucifera)?

Answer: B. Coir — Coir is a natural fiber extracted from the fibrous husk (mesocarp) of the coconut fruit.

Q: Match the spice with its economically useful plant part: 1. Cardamom - (i) Unopened flower bud 2. Clove - (ii) Rhizome 3. Turmeric - (iii) Fruit/Seed capsule Which of the following represents the correct match?

Answer: B. 1-(iii), 2-(i), 3-(ii) — Cardamom is harvested for its dried fruits (capsules), cloves are dried unopened flower buds, and turmeric is obtained from the underground rhizome.

BOTANY · CLASS 12th · Tamil Nadu State Board

Practice Chapter 10: Economically Useful Plants and Entrepreneurial Botany with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th BOTANY. This chapter covers: The final chapter details economically important plants including food crops spices fiber plants timber trees and medicinal plants. Students explore bio-fertilizers organic farming.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 10: Economically Useful Plants and Entrepreneurial Botany — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th BOTANY — Chapter 10: Economically Useful Plants and Entrepreneurial Botany, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following plants is widely used in Tamil Nadu traditional medicine for treating jaundice and has the botanical name Phyllanthus amarus?

A. Nilavembu
B. Keelanelli ✓
C. Adathodai
D. Vilvam

Answer: B. Keelanelli
Phyllanthus amarus (Keelanelli) is a well-known medicinal herb traditionally used in Tamil Nadu for treating jaundice and other liver-related ailments.

Which of the following fibers is obtained from the outer husk of the coconut fruit (Cocos nucifera)?

A. Flayed fiber
B. Coir ✓
C. Jute
D. Hemp

Answer: B. Coir
Coir is a natural fiber extracted from the fibrous husk (mesocarp) of the coconut fruit.

A symbiotic association between a fungus and the roots of higher plants is called Mycorrhiza. How does this association primarily benefit the host plant?

A. Enhances nitrogen fixation directly from the atmosphere
B. Increases the absorption of phosphorus and other essential nutrients ✓
C. Produces oxygen in waterlogged soils
D. Synthesizes organic carbohydrates for the host

Answer: B. Increases the absorption of phosphorus and other essential nutrients
Mycorrhizae extend the root surface area, allowing plants to absorb nutrients, particularly phosphorus and other microelements, more efficiently.

Match the spice with its economically useful plant part: 1. Cardamom - (i) Unopened flower bud 2. Clove - (ii) Rhizome 3. Turmeric - (iii) Fruit/Seed capsule Which of the following represents the correct match?

A. 1-(ii), 2-(i), 3-(iii)
B. 1-(iii), 2-(i), 3-(ii) ✓
C. 1-(iii), 2-(ii), 3-(i)
D. 1-(i), 2-(iii), 3-(ii)

Answer: B. 1-(iii), 2-(i), 3-(ii)
Cardamom is harvested for its dried fruits (capsules), cloves are dried unopened flower buds, and turmeric is obtained from the underground rhizome.

During the cultivation of the button mushroom (Agaricus bisporus), a crucial process called 'Casing' is performed. What is the primary botanical and physiological objective of Casing?

A. To sterilize the compost to prevent bacterial contamination
B. To cover the colonized compost with a layer of soil/peat to retain moisture, regulate temperature, and induce sporophore formation ✓
C. To inoculate the substrate with high-quality mushroom spawn
D. To ferment the straw using anaerobic bacteria to release nutrients

Answer: B. To cover the colonized compost with a layer of soil/peat to retain moisture, regulate temperature, and induce sporophore formation
Casing is the process of putting a 3-4 cm thick layer of soil/peat over the fully run compost to preserve moisture, maintain temperature, and provide physical support to stimulate mushroom pinning (sporophore formation).

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