Q71
How many turns of Calvin cycle yield one molecule of glucose?
Correct Answer
Option C
Solution
(c) Six turns of Calvin cycle fix 6 CO2 to produce one glucose.
Photosynthesis in Higher Plants
Q72
Which pair is wrong?
Correct Answer
Option A
Solution
(a) Maize is a C4 plant, not C3.
Q73
In photosynthesis energy from light reaction to dark reaction is transferred in the form of
Correct Answer
Option B
Solution
(b) ATP transfers energy from light reactions to Calvin cycle.
Q74
In sugarcane plant 14CO2 is fixed in malic acid, the enzyme that fixes CO2 is
Correct Answer
Option C
Solution
(c) PEP carboxylase fixes CO2 in mesophyll cells of sugarcane (C4).
Q75
Stomata of CAM plants
Correct Answer
Option D
Solution
(d) CAM plants open stomata at night to fix CO2 as malic acid, conserving water.
Q76
In C3 plants, the first stable product of photosynthesis during the dark reaction is
Correct Answer
Option C
Solution
(c) 3-PGA is the first stable product in C3 cycle (Calvin cycle).
Q77
Photosynthetically active radiation is represented by the range of wavelength of
Correct Answer
Option B
Solution
(b) PAR (Photosynthetically Active Radiation) spans 400-700 nm.
Q78
As compared to a C3 plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4 plants?
Correct Answer
Option C
Solution
(c) C4 plants need 30 ATP vs 18 ATP for C3 plants — 12 additional ATP molecules.
Q79
During photorespiration, the oxygen consuming reactions occur in
Correct Answer
Option A
Solution
(a) Photorespiration: O2-consuming reactions in chloroplast stroma and peroxisomes; CO2 release in mitochondria.
Q80
In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of
Correct Answer
Option D
Solution
(d) In C4 plants, C4 cycle occurs in mesophyll cells.
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