Consider the following statements regarding photosynthesis and respiration in plants and select the correct option
I) RuBisCO has high affinity to oxygen in low $CO_2$ concentration
II)The Calvin pathway occurs in the chloroplast of bundle sheath cells of $C_4$ plants
III) Yeast poison themselves when the concentration of alcohol reaches $7\%$
IV) Oxygen is a final hydrogen acceptor during aerobic respiration
- Statements I & III are correct, II is wrong
- Statements I & IV are correct, III is wrong
- Statements II & II are correct, I is wrong
- Statements I & II are correct, IV is wrong
The Correct Option is B
Solution and Explanation
Statement I: Correct. RuBisCO exhibits oxygenase activity under low \( CO_2 \) concentrations, leading to photorespiration. This is a well-documented property of the enzyme.
Statement II: Correct. In \( C_4 \) plants, the Calvin cycle is specifically localized in the bundle sheath cells' chloroplasts, while initial carbon fixation occurs in mesophyll cells.
Statement III: Incorrect. Yeast fermentation produces ethanol, and when concentrations reach approximately 7%, it becomes toxic to the yeast cells, inhibiting their growth.
Statement IV: Correct. In aerobic respiration's electron transport chain, oxygen serves as the terminal electron acceptor, combining with electrons and protons to form water.
(B) Statements I & IV are correct, III is wrong -
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Concepts Used:
Photosynthesis in Higher Plants
Processes Of Photosynthesis in Higher Plants:
Photosynthesis in higher plants involves the following processes:
- Light Reaction
- Dark Reaction
Light Reaction:
- This phenomenon occurs in the presence of light.
- The pigment absorbs light and produces energy in the form of ATP.
- The process involves- absorption of light, water splitting, the release of oxygen, and formation of ATP and NADPH.
Dark Reaction:
This process occurs in the absence of light in the stroma of the chloroplasts. The following cycles are involved in the process:
- Calvin Cycle (C3 Cycle)
- C4 Cycle (Hatch and Slack Pathway)