Question

A green plant starts evolving \[\ce{CO2}\] instead of \[\ce{O2}\] on a hot summer day due to ______.

Options

• photorespiration

• photo-oxidation of chlorophyll-a

• high rate of respiration

• non-availability of \[\ce{H2O}\]

Answer 1

A green plant starts evolving \[\ce{CO2}\] instead of \[\ce{O2}\] on a hot summer day due to photorespiration.

Explanation:

Less CO₂ is taken up by the cells on a hot summer day because the stomata are closed. Less CO₂ gets into the plant cell, the more. the level of O₂ rises. RuBP carboxylase is changed into RuBP oxygenase as a result of an increase in O₂, which causes photorespiration.