Given below are two statements: Statement I: In $\mathrm{C}_3$ plants, some $\mathrm{O}_2$ binds to RuBisCO,…
Given below are two statements:
Statement I: In $\mathrm{C}_3$ plants, some $\mathrm{O}_2$ binds to RuBisCO, hence $\mathrm{CO}_2$ fixation is decreased.
Statement II: In $\mathrm{C}_4$ plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration.
In the light of the above statements, choose the correct answer from the options given below:
Both Statement I and Statement II are false
Statement I is true but Statement II is false
Statement I is false but Statement II is true
Both Statement I and Statement II are true
Solution
In $\mathrm{C}_3$ plant, some $\mathrm{O}_2$ bind to RuBisCO, and hence $\mathrm{CO}_2$ fixation is decreased. Statement II is incorrect, photorespiration does not occur in $\mathrm{C}_4$ plants as they lack RuBisCO in mesophyll. Hence statement I is the only correct option.