Dark reactions do not occur during the day-FalseTrue

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Standard VIII

Biology

Light and Dark Reaction

Dark reaction...

Question

Dark reactions do not occur during the day.

False

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True

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Question 08
Dark reaction in photosynthesis is called so because
(a) it can occur in dark also
(b) it does not depend on light energy
(c) it cannot occur during day light
(d) it occurs more rapidly at night

Describe the main chemical changes which occur during photosynthesis in

(i) Light reaction (ii) Dark reaction.

Q. Dark reactions do not occur during the day.

Q. Dark reaction occurs during the night.

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.

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