Chapter Exam

Chapter-10 Plant Physiology — Online MCQ Test

Q: Which process in green plants uses sunlight, carbon dioxide, and water to prepare food?

Answer: B. Photosynthesis — Photosynthesis is the process by which green plants make food using sunlight, carbon dioxide, and water. It occurs mainly in the leaves.

Q: Which tissue transports water and minerals from the roots to the other parts of the plant?

Answer: B. Xylem — Xylem carries water and dissolved minerals upward from the roots to the stem and leaves.

Q: Which of the following is necessary for photosynthesis to occur in a leaf?

Answer: A. Chlorophyll — Chlorophyll is the green pigment that traps sunlight needed for photosynthesis.

Q: Which of the following is NOT a function of xylem?

Answer: D. Transport of prepared food — Xylem transports water and minerals and also provides support. Transport of prepared food is the function of phloem.

Q: A farmer notices that after girdling a stem, the leaves above the cut remain green for some time but the roots gradually die. What is the most likely reason?

Answer: B. Phloem transport of food is blocked — Girdling removes the bark and interrupts phloem. Food cannot reach the roots, so they die, while leaves may remain green for some time due to stored water and food.

SCIENCE · Samacheer Kalvi 9th · Tamil Nadu State Board

Practice Chapter-10 Plant Physiology with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 9th SCIENCE. This chapter covers: Description Covers photosynthesis respiration transport of water and nutrients in plants Keywords Photosynthesis Respiration Transport Xylem Phloem. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-10 Plant Physiology — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 9th SCIENCE — Chapter-10 Plant Physiology, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which process in green plants uses sunlight, carbon dioxide, and water to prepare food?

A. Respiration
B. Photosynthesis ✓
C. Transpiration
D. Diffusion

Answer: B. Photosynthesis
Photosynthesis is the process by which green plants make food using sunlight, carbon dioxide, and water. It occurs mainly in the leaves.

Which tissue transports water and minerals from the roots to the other parts of the plant?

A. Phloem
B. Xylem ✓
C. Cambium
D. Epidermis

Answer: B. Xylem
Xylem carries water and dissolved minerals upward from the roots to the stem and leaves.

Which of the following is necessary for photosynthesis to occur in a leaf?

A. Chlorophyll ✓
B. Hemoglobin
C. Keratin
D. Melanin

Answer: A. Chlorophyll
Chlorophyll is the green pigment that traps sunlight needed for photosynthesis.

Which of the following is NOT a function of xylem?

A. Transport of water
B. Transport of minerals
C. Support to the plant body
D. Transport of prepared food ✓

Answer: D. Transport of prepared food
Xylem transports water and minerals and also provides support. Transport of prepared food is the function of phloem.

A farmer notices that after girdling a stem, the leaves above the cut remain green for some time but the roots gradually die. What is the most likely reason?

A. Xylem transport is completely blocked
B. Phloem transport of food is blocked ✓
C. Stomata stop opening immediately
D. Photosynthesis stops in all leaves instantly

Answer: B. Phloem transport of food is blocked
Girdling removes the bark and interrupts phloem. Food cannot reach the roots, so they die, while leaves may remain green for some time due to stored water and food.

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