Photosynthesis & Plant MCQs with Answers

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Polysaccharides in plants are synthesized by the process of condensation, where monosaccharide units join together with the removal of water molecules.

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The chromophore in phytochrome is phytochromobilin, a linear tetrapyrrole pigment that detects red and far-red light.

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Sugarcane contains sucrose, which is the common table sugar extracted commercially from sugarcane and sugar beet.

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Respiration in plants makes carbon dioxide as a by-product, just like in animals.

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Water can circulate in living organisms due to cohesion and adhesion, which together enable capillary action in plants and fluid transport in animals.

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Plants use proline as a cheap osmoticum to maintain cellular water balance under stress conditions.

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After the onset of salinity, a plant initially faces osmotic stress due to reduced water availability caused by high salt concentration in the soil.

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Chlorophyll is a green pigment found in plants that is essential for photosynthesis.

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Algae (particularly marine phytoplankton) are responsible for producing the largest amount of oxygen on Earth, contributing an estimated 50–80% of the planet's oxygen.

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CO₂ fixation in the chloroplast occurs in the stroma, the fluid-filled matrix where the Calvin cycle takes place.