Cellular Respiration and Photosynthesis NDA Questions

NDA BIOLOGY

Cellular Respiration and Photosynthesis MCQ Questions


13.
The reaction centre of Photosystem I absorbs light maximally at:
A.
600 nm
B.
680 nm
C.
700 nm
D.
450 nm
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ANSWER :
C. 700 nm
14.
The final product of the light reactions in photosynthesis are:
A.
ATP, NADPH and O₂
B.
Glucose, CO₂ and H₂O
C.
G3P, RuBP and ATP
D.
ADP, NADP⁺ and CO₂
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ANSWER :
A. ATP, NADPH and O₂
15.
In the Z-scheme of photosynthesis, electrons flow from:
A.
PS I → PS II → NADP⁺
B.
Water → PS I → PS II → NADP⁺
C.
NADP⁺ → PS I → PS II → water
D.
PS II → Electron transport chain → PS I → NADP⁺
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ANSWER :
D. PS II → Electron transport chain → PS I → NADP⁺
16.
Cyclic photophosphorylation involves only:
A.
Photosystem I
B.
Photosystem II
C.
Both PS I and PS II
D.
Neither PS I nor PS II
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ANSWER :
A. Photosystem I
17.
The dark reactions of photosynthesis (Calvin cycle) occur in the:
A.
Grana
B.
Stroma of chloroplast
C.
Thylakoid membrane
D.
Inner mitochondrial membrane
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ANSWER :
B. Stroma of chloroplast
18.
The first stable product of CO₂ fixation in the C3 (Calvin) pathway is:
A.
3-Phosphoglycerate (3-PGA)
B.
Glucose-6-phosphate
C.
Oxaloacetate (OAA)
D.
Ribulose-1,5-bisphosphate (RuBP)
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ANSWER :
A. 3-Phosphoglycerate (3-PGA)