Bioenergetics is the study of how living organisms produce, store, and use energy for their life processes. Energy is essential for growth, movement, repair, and reproduction.
In this chapter, students will learn about ATP (the cell’s energy currency), Photosynthesis, and Cellular Respiration. These notes are designed to be easy to understand, follow the 2026 Punjab Board syllabus, and are perfect for exam preparation and quick revision.
Class 9 Biology Chapter 8 MCQs – Bioenergetics
1. Which type of chlorophyll is most common in plants?
(a) Chlorophyll a
(b) Chlorophyll b
(c) Chlorophyll c
(d) Chlorophyll d
Correct Answer:
✅ (a) Chlorophyll a
2. Which molecule donates electrons in the light-dependent reactions of photosynthesis?
(a) NADPH
(b) Water
(c) Oxygen
(d) Carbon dioxide
✅ Correct Answer: (b) Water
3. Which bond in ATP is considered a high-energy bond?
(a) Adenine–ribose bond
(b) First phosphate bond
(c) Outer phosphate bond
(d) Hydrogen bond
✅ Correct Answer: (c) Outer phosphate bond
4. Dark reactions of photosynthesis occur in:
(a) Thylakoid
(b) Stroma
(c) Cytoplasm
(d) Mitochondria
✅ Correct Answer: (b) Stroma
5. Which scientist discovered the details of dark reactions?
(a) Watson
(b) Darwin
(c) Melvin Calvin
(d) Mendel
✅ Correct Answer: (c) Melvin Calvin
6. Which colors of light are most effective for photosynthesis?
(a) Green and yellow
(b) Blue and red
(c) Violet and orange
(d) White and green
✅ Correct Answer: (b) Blue and red
📥 Download Chapter 8 Bioenergetics Notes PDF
Skip to PDF contentGet Class 9 Biology Chapter 8 – Bioenergetics complete notes including:
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ATP: The Cell’s Energy Currency
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Photosynthesis (Light & Dark Reactions)
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Cellular Respiration (Aerobic & Anaerobic)
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Important MCQs, Short Questions & Long Questions
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Why These Notes Are Helpful
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Simple and clear explanations for easy understanding
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Covers all key points of Chapter 8 as per Punjab Board syllabus
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Important questions included for exams
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Quick revision tips and bullet points for last-minute study