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 18, 2024
  • 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

RuBiscO is an enzyme that acts as an oxygenase in low carbon dioxide concentration and acts as a carboxylase under high concentration of carbon dioxide. RuBisco binds with oxygen at high temperatures and low $CO _{2}: O _{2}$ ratio and binds with carbon dioxide at low temperatures and high $CO _{2}: O _{2}$ ratio.
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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)