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Opening and Closing of the Stomata

In green leav...

Question

In green leaves, the light and dark reactions occur in

A

Stroma and grana respectively

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B

Grana and stroma respectively

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C

Cristae and matrix respectively

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D

Both occur in cytoplasm

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Solution

The correct option is B Grana and stroma respectively
In plants, photosynthesis takes place in the chloroplast. Photosynthesis is classified as light reaction and dark reaction (calvin cycle). Grana is the stack of thylakoids in the chloroplast. These are the sites of light reaction in which ATP and NADPH are produced. The fluid surrounding the granum are the stroma that is a site for dark reaction (Calvin cycle) in which ATP and NADPH are used. Thus, the correct answer is option B.

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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. Match the sites in list I with the processes in list II and choose the correct combination from the options.

	List I		List II
A	Grana of chloroplast	1	Krebs cycle
B	Stroma of chloroplast	2	Light reaction
C	Cytoplasm	3	Dark reaction
D	Mitochondrial matrix	4	Glycolysis

Q. Assertion :Dark reaction occurs only at night in the stroma of chloroplast. Reason:

C O_{2}

fixation occurs only during

C_{3}

Both grana and stroma

Q. Fill in the blanks with the appropriate answer from the choices given in the brackets.
The site of light reaction in the cells of a leaf is .................. (cytoplasm, stroma, grana).

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