Skip to content
doubtly
Sign up

C3 and C4 pathways, photorespiration

13 solved questions

Ask a question

Every question from past board papers on C3 and C4 pathways, photorespiration, newest paper first. Open any question for its full worked answer.

NEET UG 2025 question paper (official, booklet 45)

Full paper →

  1. Which of the following statements about RuBisCO is true?

    4 marks · See worked answer →

NEET UG 2024 question paper (official, booklet S6)

Full paper →

  1. How many molecules of ATP and NADPH are required for every molecule of \(CO_2\) fixed in the Calvin cycle?

    4 marks · See worked answer →

  2. Which of the following are required for the dark reaction of photosynthesis?

    A. Light

    B. Chlorophyll

    C. \(CO_2\)

    D. ATP

    E. NADPH

    Choose the correct answer from the options given below:

    4 marks · See worked answer →

  3. Given below are two statements:

    Statement I : In \(C_3\) plants, some \(O_2\) binds to RuBisCO, hence \(CO_2\) fixation is decreased.

    Statement II : In \(C_4\) 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:

    4 marks · See worked answer →

NEET UG 2023 question paper (official, booklet G6)

Full paper →

  1. How many ATP and NADPH\(_2\) are required for the synthesis of one molecule of Glucose during Calvin cycle?

    4 marks · See worked answer →

NEET UG 2022 question paper (official, booklet R6)

Full paper →

  1. Given below are two statements :

    Statement I :

    The primary CO\(_2\) acceptor in C\(_4\) plants is phosphoenolpyruvate and is found in the mesophyll cells.

    Statement II :

    Mesophyll cells of C\(_4\) plants lack RuBisCo enzyme.

    In the light of the above statements, choose the correct answer from the options given below :

    4 marks · See worked answer →

  2. What is the role of large bundle shealth cells found around the vascular bundles in C\(_4\) plants ?

    4 marks · See worked answer →

NEET UG 2021 question paper (official, booklet M4)

Full paper →

  1. Match List - I with List - II.

    List - I | List - II

    (a) Cohesion | (i) More attraction in liquid phase

    (b) Adhesion | (ii) Mutual attraction among water molecules

    (c) Surface tension | (iii) Water loss in liquid phase

    (d) Guttation | (iv) Attraction towards polar surfaces

    Choose the correct answer from the options given below.

    4 marks · See worked answer →

  2. The first stable product of CO\(_2\) fixation in sorghum is :

    4 marks · See worked answer →

NEET UG 2020 question paper (official, booklet E1)

Full paper →

  1. The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of :

    4 marks · See worked answer →

NEET UG 2017 question paper (official, booklet B)

Full paper →

  1. Phosphoenol pyruvate (PEP) is the primary \(CO_2\) acceptor in :

    4 marks · See worked answer →

NEET UG 2016 Phase 1 question paper (official, booklet A)

Full paper →

  1. A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant ?

    4 marks · See worked answer →

NEET UG 2016 Phase 2 question paper (official, booklet ZZ)

Full paper →

  1. The process which makes major difference between \(C_3\) and \(C_4\) plants is

    4 marks · See worked answer →