Question:

Stroma in the chloroplasts of higher plant contains

Updated On: Aug 6, 2024
  • light-dependent reaction enzymes
  • ribosomes
  • chlorophyll
  • light-independent reaction enzymes
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The Correct Option is D

Solution and Explanation

The dark reactions of photosynthesis is purely enzymatic and slower than the primary photochemical reaction. It takes place in stroma portion of the chloroplast and is independent of light i.e., it can occur either in presence or in absence of light provided that assimilatory power is available.
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Concepts Used:

Photorespiration

Photorespiration is a wasteful process in plants in which plants intake oxygen, and sunlight and release carbon dioxide and no glucose is formed. Photorespiration generally takes place when the concentration of oxygen in the leaves is very high and that of carbon dioxide is very low.

In Calvin cycle carbon dioxide fixation does not take place . Hence, instead of carbon dioxide oxygen reacts with RuBP.

Photorespiration in C3 and C4 Plants:

  • C4 plants do not undergo photorespiration due to their special mechanism to increase the CO2 level for enzyme binding.
  • In Hatch and Slack Pathway, C4 acid and oxaloacetic acid breaks down to release CO2.
  • This ensures a high concentration of intercellular CO2.
  • Thus, in C4 plants, RuBisCO is more active as a carboxylase enzyme rather than as an oxygenase.
  • This is why C4 plants have better productivity.