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Types of Respiration

The reaction ...

Question

The reaction in which ATP and $N A D P H_{2}$ is produced is called

A

True

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B

False

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C

Metamorphism

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D

Phototropism

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Solution

The correct option is B
False

The reaction involving chlorophyll, solar energy and water that produces ATP (Adenosine Tri-Phosphate) and $N A D P H_{2}$ (Nicotinamide Adenine Dinucleotide Phosphate-reduced form) is called light reaction.

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Q. Following table summarises the differences between light reaction and dark reaction.

	Light reaction	Dark reaction
i	These are also called as biosynthetic phase	These are also called as photochemical phase
ii	These reaction occur over thylakoids.	These reaction occur in stroma of chloroplasts.
iii	These produce assimilatory power i.e. $N A D P H_{2}$ and ATP	These consume $N A D P H_{2}$ and ATP.
iv	These are direction dependent upon light.	These depend upon the products synthesised during light reaction

Which of the above pairs of difference is/are incorrect?

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. The reaction

C H_{2} = C H_{2} + H_{2} N i - ------ \to 250 - 300^{\circ} C C H_{3} - C H_{3}

Primary amine on heating with $C S_{2}$ followed by excess of mercuric chloride gives Isothiocyanate. The reaction is called

Q. Nitroso amines

(R_{2} N - N = O)

are soluble in water. On heating them with concentrated

H_{2} S O_{4}

they give secondary amines. The reaction is called

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