Photosynthesis in Higher Plants

The functions of stomata are ____.

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Stomata are mainly involved in respiration and removal of water vapour from the leaves.

In which of the following stages, are two molecules of 3-PGA formed in Calvin pathway?

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During the carboxylation stage two molecules of 3-PGA are produced.

Why is lumen of the thylakoids filled with protons and hydrogen ions?

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Since splitting of the water molecule takes place on the inner side of the membrane, the protons or hydrogen ions produced by the splitting of water accumulate within the lumen of the thylakoids.

How many molecules of CO2 are used in Calvin pathway?

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In Calvin pathway, a total of six molecules of CO2 are utilized.

Which of the following stages is responsible for the continuous production of the CO2 acceptor molecule RuBP in Calvin pathway?

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Regeneration of the CO2 acceptor molecule RuBP is crucial if the cycle is to continue uninterrupted.

Which of the following also helps along with electron in the reduction of NADP+ to NADPH + H+?

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Along with electrons that come from the acceptor of electrons of PS I, protons are necessary for the reduction of NADP+ to NADPH+ H+.

Which of the following is not the phase of light reaction?

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carbon dioxide is not released instead used during light reaction.

Which of the following pigment forms the reaction center?

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The single chlorophyll a molecule forms the reaction centre in both the phostosystems, PSI and PSII.

During photosynthesis, carbon dioxide from the air enter the leaves of a plant through ____.

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During photosynthesis, carbon dioxide from the air enter the leaves of a plant through stomata.

Which of the following is not a net product of non-cyclic photophosphorylation?

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ADP is not a net product of non-cyclic photophosphorylation. The net products of non-cyclic photophosphorylation are ATP, NADPH and O2.

Microbial conversion of ammonia to nitrate is termed as ____.

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Microbial conversion of ammonia to nitrate is termed as Nitrification and is carried out by nitrifying bacteria like Nitrosomonas and Nitrobacter.

Carbon dioxide and water are the raw materials for photosynthesis.

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During photosynthesis, as a result of photolysis, oxygen is released out into the atmosphere.

In bell jar experiment for photosynthesis, potassium hydroxide is used to ____.

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In the bell jar experiment, potassium hydroxide is used to absorb carbon dioxide. This experiment proves that carbon dioxide is essential for photosynthesis.

The most important pigment necessary for photosynthesis is ____.

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Chlorophyll pigment can trap the photons from the sun light and use it for synthesis of starch.

Which of the following occurs among the biotic components in an ecosystem?

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Flow of energy and cycling of the materials are major attributes of the biotic component of the ecosystems.

Acid rain contains ____.

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Acid rain is the mixture of HNO2, HNO3, H2SO3 and H2SO4

Iodine turns blue - black on reacting with starch in leaves.

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Iodine turns blue - black on reacting with starch. It is used to test starch synthesised by photosynthesis in leaves.

What do the numbers I and II of photosystem I and photosystem II denote?

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Photosystem I (PS I) and Photosystem II (PS II) are named in the sequence of their discovery, and not in the sequence in which they function or arranged.

Chloroplasts are found in ____.

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Chloroplasts are found in green plants only.

Air pollution is not caused by ____.

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Air pollution is not caused by hydro-electric power plants.

In the cycle of energy and nutrient flow in the ecosystem, the nutrient flow ____.

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In the cycle of energy and nutrient flow in the ecosystem, the nutrient flow is cyclic.

Which of the following replaces the electron that moves from photosystem?

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Water is split into H+, [O] and electrons. This gives oxygen, one of the net products of photosynthesis and the electrons. These electrons are used to replace those removed from photosystems.

During photosynthesis in plants, oxygen is released from ____.

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During photosynthesis in plants, photolysis of water release O2 to the atmosphere through stomata.

Which of the following is involved in the cyclic photophosphorylation?

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Cyclic photophosphorylation involves only photosystem I (PSI).

Which of the following is the first electron donor in non-cyclic photophosphorylation?

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In non-cyclic photophosphorylation, water is the first electron donor.

How many molecules of glucose are synthesized in every 6 turns of Calvin pathway?

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In Calvin pathway, only one glucose molecule is synthesized after every 6 turns of Calvin pathway

Closely packed structures in plastids that are responsible for photosynthesis are ____.

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Thylakoids consists of grana and stroma that are responsible for light and dark reactions of photosynthesis.

Which of the following part of ATPase is embedded in the membrane and forms a transmembrane channel?

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The ATPase enzyme consists of two parts FO and F1. F0 is embedded in the membrane and forms a transmembrane channel that carries out facilitated diffusion of protons across the membrane.

The raw materials for photosynthesis are ____.

Correct! Wrong!

Carbon dioxide and water are the raw materials for photosynthesis.

How many carbon atoms should the initial acceptor molecule in the dark reaction have?

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The scientists conducted many experiments and discovered that the 5-carbon RuBP as the initial acceptor molecule.

ICSE Class 10th Biology 4 - Photosynthesis MCQS
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