Mcqs | Mechanism of Photosynthesis

 

1. Mechanism of photosynthesis consist of:
   A) Cytoplasm and nucleus    B) Mitochondria and cytoplasm    C) Light and dark reactions D) Ribosomes and nucleus
2. Light reactions of photosynthesis take place in:
   A) Stroma of chloroplast            B) Cytoplasm    C) Nucleus         D) Thylakoid membranes
3. The energy molecules produced in light reactions are:
   A) ATP only       B) NADPH only   C) Glucose + ATP           D) ATP and NADPH
4. NAD is a:
   A) Protein         B) Coenzyme    C) Vitamin        D) Hormone
5. The phosphorylated form of NAD is called:
   A) NADH            B) NAD             C) NADP         D) NADPH₂
6. When chlorophyll absorbs light, its electrons become:
   A) Negatively charged    B) Low-energy               C) High-energy             D) Neutral
7. The high-energy electrons released from chlorophyll are passed to:
   A) Ribosomes                 B) Electron transport chain       C) Nucleus         D) ATP synthase
8. During electron transport, when electrons move from higher to lower energy level, they:
   A) Form glucose             B) Release energy         C) Break NADP              D) Release oxygen
9. The released energy during electron transport is used to make:
   A) Glucose         B) NAD              C) ATP             D) ADP
10. Water molecule in light reaction is:
    A) Oxidized only             B) Broken (photolysis) C) Converted to glucose             D) Converted to NADPH
11. The splitting of water in light reaction releases:
    A) Carbon dioxide           B) Oxygen        C) Glucose         D) Ribose
12. During photolysis of water, hydrogen atoms provide:
    A) Electrons to chlorophyll        B) ATP to mitochondria C) NADPH to stroma       D) Glucose to cytoplasm
13. The hydrogen ions from water are used to:
    A) Form glucose             B) Reduce NADP into NADPH       C) Release oxygen          D) Oxidize chlorophyll
14. The final product of light reaction, besides ATP, is:
    A) Glucose         B) Oxygen         C) NADPH         D) AMP
15. The function of NADPH is to:
    A) Provide oxygen          B) Act as reducing agent            C) Break glucose            D) Store water
16. Oxygen produced in light reactions comes from:
    A) Chlorophyll               B) Carbon dioxide           C) Water molecule        D) NADP
17. The process in which light breaks water is called:
    A) Oxidation                  B) Reduction                  C) Photolysis                D) Hydrolysis
18. In light reactions, chlorophyll acts as:
    A) Enzyme         B) Light absorber and electron donor      C) Coenzyme                 D) ATP producer
19. The energy absorbed by chlorophyll is:
    A) Thermal energy         B) Light energy (photons)          C) Chemical energy       D) Nuclear energy
20. Which of the following is NOT a product of light reactions?
    A) ATP             B) Glucose        C) Oxygen         D) NADPH

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