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When CO2 is added to PEP, the first stable product synthesised is
a. Oxaloacetate
b. Pyruvate
c. Glyceraldehyde -3 -phosphate
d. Phosphoglycerate
 

Answer - The answer is the option a. Oxaloacetate

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The reaction that is responsible for the primary fixation of CO 2 is
catalysed by
a. PGA synthase
b. RuBP carboxylase and PEP carboxylase
c. RuBP carboxylase
d. PEP carboxylase
 

Answer - b. RuBP carboxylase and PEP carboxylase
Explanation - PEP carboxylase in C4 plants and RuBP carboxylase in C3 plants

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The enzyme that is found in a C 3 plant is
a. ATP synthase
b. NADP reductase
c. PEP carboxylase
d. RuBP carboxylase
 

Answer - c. PEP carboxylase
Explanation - PEP carboxylase and PEP are not found in C 3 plants.

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The correct sequence of flow of electron in the light reaction is
a. PSI, ferredoxin, PSII
b. PSI, plastoquinone, cytochromes, PS II, ferredoxin
c. PS II, plastoquinone, cytochromes, PS I, ferredoxin
d. PS I, plastoquinone, cytochromes, PS I, ferredoxin
 

Answer - The answer is the option c. PS II, plastoquinone, cytochromes, PS I, ferredoxin

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Splitting of water is associated with
a. Lumen of thylakoid
b. Photosystem I
c. Both photosystem I and II
d. Inner surface of thylakoid membrane

Answer - The answer is the option d. Inner surface of thylakoid membrane

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PEP is primary CO2 acceptor in
a. C3 plants
b. C4 plants
c. C2 plants
d. Both C3 and C4 plants

Answer - The answer is the option b. C4 plants
Explanation - PEP is found in mesophyll cells. It is the primary carbon dioxide acceptor in C4 plants

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Dark reaction in photosynthesis is called so because
a. It does not depend on light energy
b. It cannot occur during day light
c. It occurs during day light
d. It can occur in dark also

Answer - The answer is the option a. It does not depend on light energy

Explanation - Light reaction occurs due to the presence of light when the splitting of water molecules can take place. This results in the formation of ATP. The entire reaction is termed as a light reaction. However, further steps do not depend on the presence of light, and hence the process is termed as a dark reaction. This does not indicate that the process occurs in the dark and not during daytime.

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During light reaction in photosynthesis the following are formed
a. ATP, hydrogen donor and O 2
b. ATP and sugar
c. ATP, hydrogen and O 2 donor
d. Hydrogen, O 2 and sugar
 

Answer - The answer is the option c. ATP, Hydrogen and O 2 donor Explanation - During light reaction, water molecules split and release hydrogen and oxygen donor.

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Energy required for ATP synthesis in PS II comes from
a. Electron gradient
b. Reduction of glucose
c. Oxidation of glucose
d. Proton gradient
 

Answer - The answer is the option d.

Proton Gradient

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Chemosynthetic bacteria obtain energy from
a. Organic substances
b. Inorganic chemical
c. Sun
d. Infrared rays
 

Answer - The answer is the option b. Inorganic chemical
Explanation - For making organic chemicals, chemosynthetic bacteria utilise inorganic chemicals.

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