Practise 24 real Federal Board questions on Bioenergetics from 2023 to 2026. See the answer and explanation as soon as you answer.
Bioenergetics is one of the 15 main chapters in our Federal Board Matric Biology question bank (9th and 10th class), and about 6% of its real questions come from it. Tayyari Karo has 24 real questions on this chapter from 2023 to 2026; 7 are multiple choice and marked instantly, and the rest are short and long questions with a model answer. By difficulty: 16 medium, 7 easy, 1 hard.
Work through the questions below, then open the explanation for each one. Redo the ones you missed a few days later.
These are real past-paper questions. Think of your answer first, then open the explanation.
Which cells contain more chloroplasts for photosynthesis?
Answer: D. Mesophyll cells
Mesophyll cells (especially palisade mesophyll) are packed with chloroplasts for photosynthesis.
Which system is involved in regulating blood glucose level?
Answer: A. Endocrine system
The endocrine system (pancreas — insulin and glucagon) regulates blood glucose level.
NADH releases ________ when it passes through electron transport chain.
Answer: B. 3 ATP molecules
Oxidation of one NADH via the electron transport chain yields about 3 ATP molecules.
Light dependent reactions of photosynthesis occur in which part of cell?
Answer: A. Thylakoid membrane
The light reactions take place on the thylakoid membrane, where photosystems and the electron transport chain are located.
Which process generates energy for cells through cellular respiration?
Answer: C. Aerobic respiration
Aerobic respiration is the main cellular respiration process producing the most ATP using oxygen.
Determine the amount of energy in the given equation: NADH → 3ATP + 3Pi + E
Answer: C. 21.9 kCal
Each ATP stores about 7.3 kcal/mol; forming 3 ATP captures 3 × 7.3 = 21.9 kCal of the energy released by NADH oxidation.
Name any three main tissues found in a typical leaf and state one function of each.
(1) Epidermal tissue — covers and protects the leaf surface and controls gas exchange/water loss via stomata. (2) Mesophyll tissue (palisade/spongy) — carries out photosynthesis, being rich in chloroplasts. (3) Vascular tissue (xylem and phloem) — transports water/minerals (xylem) and manufactured food (phloem) to and from the leaf.
Briefly explain the role of chlorophyll and sunlight in photosynthesis.
Chlorophyll, the green pigment in chloroplasts, absorbs light energy (mainly red and blue wavelengths) and converts it into chemical energy, exciting electrons that drive the light reactions.
Sunlight provides the energy source needed to split water molecules (photolysis, releasing O₂) and to generate ATP and NADPH, which are then used in the dark reactions (Calvin cycle) to fix CO₂ into glucose. Without light, chlorophyll cannot capture energy and photosynthesis cannot proceed.
| Session | Questions |
|---|---|
| 2026 Annual | 3 |
| 2025 1st Annual | 7 |
| 2025 2nd Annual | 4 |
| 2024 Annual | 6 |
| 2023 Annual | 4 |
24 real Federal Board (FBISE) Biology questions on Bioenergetics from 2023 to 2026, for 9th and 10th class. Each one shows the session it came from.
No. We could not find an official FBISE marking scheme for these papers, so the answers and explanations are written by Tayyari Karo for practice. Check anything important with your teacher or textbook.
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