How many molecules of ATP and NADPH are required for every molecule of fixed in the Calvin cycle? [2024]
2 molecules of ATP and 3 molecules of NADPH
2 molecules of ATP and 2 molecules of NADPH
3 molecules of ATP and 3 molecules of NADPH
3 molecules of ATP and 2 molecules of NADPH.
(4)
ATP and NADPH are the products of light reaction which are required during fixation during the Calvin cycle. For every molecule entering the Calvin cycle, 3 molecules of ATP and 2 molecules of NADPH are required. To produce one molecule of glucose, 6 turns of cycles take place i.e., 6 × 3 ATP = 18 ATP and 6 × 2 NADPH = 12 NADPH are required.
Which of the following are required for the dark reaction of photosynthesis? [2024]
A. Light
B. Chlorophyll
C.
D. ATP
E. NADPH
Choose the correct answer from the options given below.
A, B and C only
B, C and D only
C, D and E only
D and E only
(3)
How many ATP and are required for the synthesis of one molecule of glucose during the Calvin cycle? [2023]
12 ATP and 16 NADPH?
18 ATP and 16 NADPH?
12 ATP and 12 NADPH?
18 ATP and 12 NADPH?
(4)
In Calvin cycle, 3 molecules of ATP and 2 ? are required for every molecule entering the cycle. For one molecule of glucose, 6 turns of the cycle are required. Thus, 18 ATP and 12 NADPH? are required for the synthesis of one molecule of glucose during the Calvin cycle.
Which of the following statements is incorrect? [2021]
Cyclic photophosphorylation involves both PSI and PS II.
Both ATP and NADPH + are synthesized during non-cyclic photophosphorylation.
Stroma lamellae have PSI only and lack NADP reductase.
Grana lamellae have both PSI and PS II
(1)
Non-cyclic photophosphorylation involves both PSI and PSII.
In photosynthesis, the light-independent reactions take place at [2015]
photosystem II
stromal matrix
thylakoid lumen
photosystem I.
(2)
The light-independent reactions (dark or Blackman’s reactions) of photosynthesis take place in the stroma or matrix of chloroplasts. These reactions are enzymatic reactions which catalyse assimilation of into carbohydrates.
Given below are two statements: [2022]
Statement I: The primary acceptor in plants is phosphoenol pyruvate and is found in the mesophyll cells.
Statement II: Mesophyll cells of plants lack RuBisCO enzyme.
In the light of the above statements, choose the correct answer from the options given below:
Both statement I and statement II are correct.
Both statement I and statement II are incorrect.
Statement I is correct but statement II is incorrect
Statement I is incorrect but statement II is correct.
(1)
In plants, the primary acceptor is a 3-carbon molecule phosphoenol pyruvate (PEP) and is present in the mesophyll cells. The enzyme responsible for the fixation is PEP carboxylase or PEPcase. Mesophyll cells of plants lack RuBisCO enzyme whereas bundle sheath cells are rich in an enzyme ribulose bisphosphate carboxylase-oxygenase (RuBisCO).
What is the role of large bundle sheath cells found around the vascular bundles in plants? [2022]
To provide the site for the photosrespiratory pathway
To increase the number of chloroplasts for the operation of the Calvin cycle
To enable the plant to tolerate high temperature
To protect the vascular tissue from high light intensity
(2)
The first stable product of fixation in sorghum is [2021]
phosphoglyceric acid
pyruvic acid
oxaloacetic acid
succinic acid
(3)
Sorghum is an example of plant, so the first stable product of fixation in this plant is oxaloacetic acid.
