The pigment that gives plants their characteristic green color and is the main pigment for photosynthesis is: MCQ with Answer and Explanation

The pigment that gives plants their characteristic green color and is the main pigment for photosynthesis is:
A. Xanthophyll
B. Chlorophyll a
C. Carotene
D. Chlorophyll b
Answer: Option B
Solution (By JKExamLibrary)
Chlorophyll a is the primary photosynthetic pigment, essential for converting light energy into chemical energy. It directly participates in the light reactions. Chlorophyll b, carotenes, and xanthophylls are accessory pigments that capture additional wavelengths and transfer energy to chlorophyll a. These accessory pigments also protect chlorophyll from photo-oxidation.

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Practice More Biology Questions

Question #1
The process by which plants lose water in the form of vapour mainly through stomata is:
A. Evaporation
B. Transpiration
C. Guttation
D. Condensation

Correct Answer: Option B


Explanation:
Transpiration is the evaporative loss of water from the aerial parts of plants, primarily through stomata. It creates transpiration pull, aiding water and mineral transport. Guttation is loss of liquid water droplets from hydathodes. Evaporation is a physical process from any surface. Condensation is change from vapour to liquid. Transpiration also cools the plant.

This question belongs to: Science Biology
Question #2
The process of cell division that results in the production of identical daughter cells for growth and repair is:
A. Binary fission
B. Budding
C. Mitosis
D. Meiosis

Correct Answer: Option C


Explanation:
Mitosis is equational division producing two genetically identical diploid daughter cells, essential for growth, development, and tissue repair in multicellular organisms. Meiosis produces haploid gametes with variation, binary fission is asexual in prokaryotes, budding in yeast. Mitosis maintains chromosome number.

This question belongs to: Science Biology
Question #3
The enzyme that converts glucose into ethanol in yeast is:
A. Lactase
B. Invertase
C. Maltase
D. Zymase

Correct Answer: Option D


Explanation:
Zymase is the enzyme complex in yeast that catalyzes alcoholic fermentation, converting pyruvate to ethanol and CO₂. Invertase hydrolyzes sucrose, lactase breaks lactose, maltase breaks maltose. Zymase activity is exploited in baking and brewing industries.

This question belongs to: Science Biology