Which of the following statements is incorrect?

NEET-(Oct)2020 [Photosynthesis-in-Higher-Plants] [class-xi ]

• RuBisCO is a bifunctional enzyme
• In C₄ plants, the site of RuBisCO activity is mesophyll cell
• The substrate molecule for RuBisCO activity is a 5-carbon compound
• RuBisCO action requires ATP and NADPH
Correct Option: B  [ In C₄ plants, the site of RuBisCO activity is mesophyll cell ]

Remark:

During non-cyclic photophosphorylation, when electrons are lost from the reaction centre at PS II, what is the source which replaces these electrons?

NEET-(Oct)2020 [Photosynthesis-in-Higher-Plants] [class-xi ]

• Oxygen
• Water
• Carbon dioxide
• Light
Correct Option: B  [ Water ]

Remark:

Which of the following are required for the dark reaction of photosynthesis?
A. Light
B. Chlorophyll
C. CO₂
D. ATP
E. NADPH
Choose the correct answer from the options given below:

NEET-2024 [Photosynthesis-in-Higher-Plants] [class-xi ]

• D and E only
• A, B and C only
• C, D and E only
• B, C and D only
Correct Option: C  [ C, D and E only ]

Remark:

How many molecules of ATP and NADPH are required for every molecule of CO₂ fixed in the Calvin cycle?

NEET-2024 [Photosynthesis-in-Higher-Plants] [class-xi ]

• 2 molecules of ATP and 2 molecules of NADPH
• 2 molecules of ATP and 3 molecules of NADPH
• 3 molecules of ATP and 2 molecules of NADPH
• 3 molecules of ATP and 3 molecules of NADPH
Correct Option: C  [ 3 molecules of ATP and 2 molecules of NADPH ]

Remark: Explanation: NCERT Page. 145 (Topic: 11.7.2 The Calvin Cycle)

Given below are two statements:

Statement I: In C3 plants, some O2 binds to RuBisCO, hence CO2 fixation is decreased.

Statement II: In C4 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:

NEET-2024 [Photosynthesis-in-Higher-Plants] [class-xi ]

• Both Statement I and Statement II are false
• Both Statement I and Statement II are true
• Statement I is false but Statement II is true
• Statement I is true but Statement II is false
Correct Option: D  [ Statement I is true but Statement II is false ]

Remark: Explanation: NCERT Page No.147, (Topic-11.9 PHOTORESPIRATION)