More practice questions

4. Q4. In which cells of a C_₄ plant does the Calvin cycle take place, and in which cells of a C_₃ plant?

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   Only in the bundle sheath cells of a C_₄ plant; in all the mesophyll cells of a C_₃ plant (NCERT page 147).

5. Q5. Assertion: C_₄ mesophyll cells form OAA. Reason: C_₄ mesophyll cells have PEPcase but lack RuBisCO. Are both true, and does the reason explain the assertion?

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   Both are true, and the reason explains the assertion: the CO_₂ is fixed onto PEP by PEPcase, giving OAA (NCERT page 146).

6. Q6. What happens to the 3-carbon molecule released in the bundle sheath cells?

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   It is transported back to the mesophyll, where it is converted to PEP again, completing the cycle (NCERT page 146).