The pigment that is responsible for the green color of leaves is: MCQ with Answer and Explanation

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The pigment that is responsible for the green color of leaves is:

A. Carotene

B. Xanthophyll

C. Chlorophyll

D. Anthocyanin

Answer: Option C

Solution (By JKExamLibrary)

Chlorophyll a and b absorb red and blue light and reflect green, giving leaves their color. Carotenoids are yellow/orange, anthocyanins red/purple.

This question belongs to: Science Biology

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Practice More Biology Questions

Question #1

The phenomenon where a single gene influences multiple phenotypic traits is called:

A. Polygenic inheritance

B. Pleiotropy

C. Epistasis

D. Codominance

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Correct Answer: Option B

Explanation:
Pleiotropy occurs when one gene affects multiple seemingly unrelated traits. Example: phenylketonuria (PKU) affects mental development, skin pigmentation, and musty odor. Marfan syndrome affects skeleton, eyes, and heart. Polygenic is many genes affecting one trait, epistasis is gene interaction, codominance is both alleles expressed.

This question belongs to: Science Biology

Question #2

The process of water loss as vapor from leaves is:

A. Transpiration

B. Guttation

C. Evaporation

D. Translocation

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Correct Answer: Option A

Explanation:
Transpiration mainly occurs through stomata and drives the transpiration pull for water movement. Guttation is liquid loss, evaporation from free surface.

This question belongs to: Science Biology

Question #3

Consider statements about human respiration: 1. Hemoglobin has a higher affinity for CO2 than O2. 2. Carbonic anhydrase is present in RBCs. 3. Most CO2 is transported as bicarbonate. Which are correct?

A. 2 and 3 only

B. 1 and 3 only

C. 1 and 2 only

D. 1, 2 and 3

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Correct Answer: Option A

Explanation:
Hemoglobin has a much higher affinity for oxygen than for carbon dioxide; it binds O2 readily in the lungs. Inside RBCs, the enzyme carbonic anhydrase rapidly catalyzes the conversion of CO2 and water into carbonic acid. Approximately 70% of CO2 is transported in the blood as bicarbonate ions in the plasma. Thus, statements 2 and 3 are correct.

This question belongs to: Science Biology

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