Where does photolysis of H 2 O occur? What is its significance?

The photolysis of H 2 O occurs in the water-splitting complex of photosystem l that takes place in thylakoid membranes of chloroplasts where light is utilised to break water molecules, as discussed in the equation below: 2H 2 O → 4H + + 4e - + O 2 Significance of photolysis: It helps to liberate the oxygen in the photosynthesis process. It also provides the hydrogen required for the reaction.

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Herbicide that blocks electron transport from PS-II to PS-I by inhibiting electron flow between plastoquinone $\to$ cytochrome is

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Important Questions on Photosynthesis in Higher Plants

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

^{14} C O_{2}

is added to a suspension of photosynthesizing chloroplasts, which of the following will be the first compound to be radioactive?

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

Which of the following biomolecules is common to respiration mediated breakdown of fats, carbohydrates, and proteins?

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

The percentage of sunlight captured by plants is

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

Which of the following is not a product of a light reaction of photosynthesis?

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

The two enzymatic activities associated with RuBisCO are:

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

The process which makes a major difference between

C_{3}

and

C_{4}

plants is:

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

Z- scheme is connected with ___.

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

Emerson's enhancement effect and red drop have been instrumental in the discovery of:

HARD

Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

Which statement is wrong for Krebs' cycle?

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

Where does photolysis of H₂O occur? What is its significance?

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

A chromatography column, packed with silica gel as stationary phase, was used to separate a mixture of compounds consisting of

(A)

benzanilide

(B)

aniline and

(C)

acetophenone. When the column is eluted with a mixture of solvents, hexane:ethyl acetate

(20 : 80)

, the sequence of obtained compounds is:

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

Which one of the following options is true in photosynthesis?

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

Which of the following statements is incorrect?

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

Consider the following statements regarding photosynthesis and respiration in plants and select the correct option.
I.

RuBisCO

has high affinity to oxygen in low

{CO}_{2}

concentration.
II. The Calvin pathway occurs in the chloroplast of bundle sheath cells of

C_{4}

plants.
III. Yeast position themselves when the concentration of alcohol reaches

7 %

.
IV. Oxygen is a final hydrogen acceptor during aerobic respiration.

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

C_{4}

plants,

C_{3}

cycle takes place in

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

Cytochromes are found in:

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

How many molecules of ATP are required for the synthesis of 5 molecules of glucose during the Calvin cycle?

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Biology>Plant Physiology>Photosynthesis in Higher Plants>Photochemical Phase of Photosynthesis

Assertion $(A) :$ In $PS I$ , the reaction centre, chlorophyll 'a' has an absorption peak at $700 nm$ , hence is called $P 700$ , while in $PS II$ , it has absorption maxima at $680 nm$ and is called $P 680$ .

Reason $(R) :$ Calvin pathways occur in all photosynthetic plants, it does not matter where they have $C_{3}$ or $C_{4}$ pathways and the Calvin cycle described in three stages: Carboxylation, reduction and regeneration.

The correct answer is:

Herbicide that blocks electron transport from PS-II to PS-I by inhibiting electron flow between plastoquinone → cytochrome is

Important Questions on Photosynthesis in Higher Plants

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Herbicide that blocks electron transport from PS-II to PS-I by inhibiting electron flow between plastoquinone $\to$ cytochrome is