Photosynthesis MCQs for NEET — Botany Questions with Answers

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In Calvin cycle,

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Explanation

In the Calvin cycle, fructose 1,6-bisphosphate undergoes dephosphorylation to produce glyceraldehyde-3-phosphate (G3P). This step is crucial for the synthesis of glucose and other carbohydrates.

Photo-oxidation of chlorophyll and cell contents as a result of high light intensity is known as

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Explanation

Solarization refers to the damage caused to chlorophyll and cell contents due to excessive light intensity, leading to photo-oxidation. This process can impair photosynthesis and affect plant health.

The prerequisities of Calvins cycle are

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Explanation

The Calvin cycle, also known as the light-independent reactions or dark reactions, requires CO2, ATP, and NADPH2. These components are essential for the synthesis of glucose from carbon dioxide and water.

In the calvin cycle, the assimilatory power is used during

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Explanation

In the Calvin cycle, the assimilatory power (ATP and NADPH) is used during the conversion of 3-phosphoglycerate (PGA) to glyceraldehyde-3-phosphate (PGAL). This step is crucial for the synthesis of carbohydrates in plants.

Loculus is the internal space of

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Explanation

The loculus is the internal space or lumen of the thylakoid structure in chloroplasts. Thylakoids are membrane-bound compartments inside chloroplasts and cyanobacteria, the site of the light-dependent reactions of photosynthesis.

Calvins cycle involves

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Explanation

The Calvin cycle, also known as the C3 cycle, involves reductive carboxylation. In this cycle, carbon dioxide is added to a 5-carbon sugar (ribulose bisphosphate, RuBP) and then reduced to form glucose.

In C4 plants, carboxylation is twice, it can be represented as

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Explanation

In C4 plants, carboxylation occurs in two steps. First, PEP (phosphoenolpyruvate) combines with CO2 to form oxaloacetic acid, which is then converted to malate. The malate is transported to bundle-sheath cells, where it releases CO2 to be fixed again by RuBP (ribulose bisphosphate) in the Calvin cycle.

Ribbon shaped chloroplast is present in

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Explanation

Spirogyra is a filamentous green algae that contains ribbon-shaped chloroplasts arranged in a spiral manner. This unique structure is why Spirogyra is known for its distinctive chloroplast morphology.

Photosynthesis takes place

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Explanation

Photosynthesis can occur in visible light obtained from any source, not just sunlight. This means that artificial light sources that emit visible light can also drive the photosynthetic process.

Chlorophyll-a differes from chlorophyll-b in having

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Explanation

Chlorophyll-a and chlorophyll-b are two types of chlorophyll found in plants and algae. Chlorophyll-a has a methyl group (-CH3) at the third carbon position in its structure, whereas chlorophyll-b has an aldehyde group (-CHO) at the same position. This difference in functional groups distinguishes chlorophyll-a from chlorophyll-b.

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