Biology Bioenergetics Quiz – 1st Year Science | Chapter 6 Study Tool
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Total Marks: 50
Time: 60 min
Questions: 25

Biology (SNC) – 1st Year

Chapter: #6 – Bioenergetics
Subject: Biology
Level: 1st Year Science
Type: Practice Quiz

Chapter 6: Bioenergetics

Multiple Choice Questions (10×1=10)

1
Which of the following are produced by the reactions that occur in the thylakoid and consumed by the reactions that occur in the stroma?
A CO₂ and H₂O
B Glucose and O₂
C NADP⁺ and ADP
D ATP and NADPH
2
Bioenergetics is the study of:
A Ecosystem flow
B Chemical evolution
C Energy relationships
D Genetic variation
3
What is entropy?
A Stored energy
B Order in systems
C Energy required
D Disorder or randomness
4
Which pigment absorbs light mostly in the red and blue regions?
A Xanthophyll
B Carotene
C Chlorophyll-a
D Anthocyanin
5
Which of the following is common to both aerobic and anaerobic respiration?
A Krebs cycle
B Glycolysis
C ETC
D Alcohol production
6
The electron transport chain is located in the:
A Cytoplasm
B Inner mitochondrial membrane
C Nucleus
D Mitochondrial matrix
7
The final electron acceptor in the electron transport chain is:
A Hydrogen
B NADH
C Oxygen
D Carbon dioxide
8
Chemiosmosis is the movement of:
A Electrons
B Glucose
C Water
D Protons (H⁺ ions) across a membrane
9
Which molecules donate electron of ETC?
A NADH and FADH₂
B ATP and ADP
C Pyruvate and oxygen
D Glucose and water
10
Water is formed in ETC when:
A ATP breaks down
B NADH oxidizes
C Oxygen accepts electrons and protons
D Glucose reacts with oxygen

Short Answer Questions (15×2=30)

Detailed Answer Questions (Answer any 2) (2×5=10)

1. Describe how the role of water in photosynthesis can be explained through experiment.

Key Experimental Concepts:
Water (H₂O) → Split by light energy →
H⁺ + e⁻ + ½O₂ →
Electrons replace those lost by chlorophyll
Protons create gradient for ATP synthesis
Oxygen released as byproduct

2. Describe light independent reactions of photosynthesis in terms of paragraph and illustrate in terms of Calvin cycle.

Calvin Cycle Simplified Diagram:
CO₂ + RuBP (5C) → Unstable 6C compound →
↓ (Rubisco enzyme)
2 × 3PGA (3C) →
↓ (ATP + NADPH from light reactions)
2 × G3P (3C) →
↓ (some regenerate RuBP, some form glucose)
Glucose (6C) + RuBP (5C)

Key points to include: Carbon fixation, Reduction phase, Regeneration of RuBP, Use of ATP and NADPH from light-dependent reactions, Role of Rubisco enzyme.

3. Describe cyclic photophosphorylation and the process of chemiosmosis in light-dependent reactions.

Cyclic Photophosphorylation & Chemiosmosis:
Light → Photosystem I →
e⁻ excited → Transport chain →
H⁺ pumped into thylakoid space →
Gradient drives ATP synthase →
ADP + P → ATP
e⁻ returns to Photosystem I

Key points to include: Only Photosystem I involved, ATP production without NADPH, Proton gradient formation, ATP synthase mechanism, Comparison with non-cyclic photophosphorylation.