Which of the following statements about plant tissues is correct? MCQ with Answer and Explanation

Explanation:
Glycogen is a highly branched polysaccharide of glucose, stored primarily in the liver and muscles. Starch is the plant equivalent. Cellulose is a structural polysaccharide in plants, chitin in arthropods and fungi. Glycogen can be rapidly mobilized to maintain blood glucose.

Explanation:
Scurvy is caused by a deficiency of Vitamin C (Ascorbic acid). Vitamin C is essential for the synthesis of collagen, a structural protein in connective tissues. Its deficiency leads to weakened blood vessels, causing symptoms like bleeding gums, loose teeth, joint pain, and poor wound healing. It was historically common among sailors lacking fresh fruits and vegetables.

Explanation:
Photolysis of water occurs at the manganese cluster of photosystem II, releasing electrons, protons, and oxygen. The electrons replace those lost by P680. Photosystem I reduces NADP⁺. Cytochrome b6f transports electrons between the two photosystems. Thus, water splitting is a hallmark of PSII.