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What Is Dark Reaction

In the follow...

Question

In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: In light reaction of photosynthesis, light is required for the functioning of PS I and PS II, and production of NADPH and ATP.
Reason: Dark reaction does not occur in light.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

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B

If both assertion and reason are true but reason is not the correct explanation of assertion.

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C

If assertion is true but reason is false.

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D

If both assertion and reason are false.

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Solution

The correct option is C If assertion is true but reason is false.

Light reactions of photosynthesis take place in the presence of light. These involve photolysis of water and production of assimilatory power (NADPH + ATP) through PS l and PS II.
Dark reactions of photosynthesis catalyse assimilation of $C O_{2}$ to carbohydrates. Dark reactions are light independent reactions, hence can take place both in the light as well as in the dark.

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Q. In the following question, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion: In light reaction of photosynthesis, light is required for the functioning of PS I and PS II, and production of NADPH and ATP.
Reason: Dark reaction does not occur in light.

Q. Assertion :Dark reactions are called bio synthetic phase of photosynthesis . Reason: Dark reactions do not directly depend on the presence of light but are dependent on the products of the light reactions ,i.e. ATP and NADPH.

Q. Which of the following statements correctly describes the light reactions and dark reactions taking place during photosynthesis?
(i) Light reactions occur in grana thylakoids whereas dark reactions occur in stroma of chloroplasts.
(ii) Light reactions generate ATP and

N A D P H_{2}

whereas dark reactions consume ATP and

N A D P H_{2}

.
(iii) Oxygen is released as a by-product during the light reactions as well as dark reactions.
(iv) Light reactions take place in the presence of light and dark reactions are independent of the products formed during light reactions.

Q. Read the following four statements a, b, c and d and select the right option having both correct statements.
(a) Z-scheme of light reaction takes place in presence of PS I only.
(b) Only PS I is functional in cyclic photophosphorylation.
(c) Cyclic photophosphorylation results into the synthesis of ATP and NADPH.
(d) Stroma lamellae lack PS II as well as NADP.

Q. Read the following four statements- A, B, C and D and select the right option having both correct statements.
(A) Z scheme of light reaction takes place in presence of PS I only.
(B) Only PS I is functional in cyclic photophosphorylation.
(C) Cyclic photophosphorylation results into synthesis of ATP and NADPH

_{2}

.
(D) Stroma lamellae lack PS II as well as NADP.

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What Is Dark Reaction

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