Question:

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

Updated On: Apr 2, 2025
  • 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
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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:

  1. Calvin Cycle (C3 Cycle)
  2. C4 Cycle (Hatch and Slack Pathway)