Photosynthesis in Higher Plants
3 solved NEET Biology previous year questions on Photosynthesis in Higher Plants, each with the correct answer and a full explanation.
Q1
Oxygen is not produced during photosynthesis by
✓ Correct answer: c) Green sulphur bacteria
ExplanationThe correct answer is:3. Green sulphur bacteria Explanation: Green sulphur bacteria are anoxygenic photosynthetic bacteria, meaning they perform photosynthesis without producing oxygen.They use hydrogen sulfide (H₂S) instead of water (H₂O) as the electron donor, so O₂ is not released as a byproduct.
Q2
The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of [NEET 2019]
✓ Correct answer: a) 1 molecule of 3-C compound
ExplanationThe oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of one molecule of 3-phosphoglycerate (PGA) and one molecule of 2-phosphoglycolate (2PG or PG).3- phosphoglycerate is a compound while 2 - phosphoglycolate is a compound.
Q3
Which of the following are required for the dark reaction of photosynthesis?1. Light2. Chlorophyll3. Carbon dioxide4. ATP5. NADPH Choose the correct answer from the options given below: [NEET 2024]
✓ Correct answer: d) 3, 4 and 5 only
ExplanationThe dark reaction (also called the Calvin cycle or light-independent reaction) does not require light directly.It uses the products of the light reaction to fix carbon dioxide into carbohydrates.Requirements of the dark reaction:3. Carbon dioxide (CO₂): Source of carbon for glucose formation.4. ATP: Provides energy for carbon fixation steps.5. NADPH: Provides reducing power (hydrogen and electrons) to reduce 3- phosphoglyceric acid to glyceraldehyde- 3-phosphate.
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