Consider statements about plant tissues: 1. Parenchyma cells have thin cell walls. 2. Collenchyma provides mechanical support. 3. Sclerenchyma cells are living at maturity. Which are correct? MCQ with Answer and Explanation

Explanation:
Photorespiration is a wasteful pathway that occurs when RuBisCO fixes O2 instead of CO2, producing phosphoglycolate. This 2-carbon compound is metabolized through a complex pathway involving three organelles: it is processed in the peroxisome, then the mitochondria, and finally returns to the chloroplast. This process consumes ATP and releases CO2 without producing any sugar.

Explanation:
Egestion (defecation) is the removal of undigested solid waste from the digestive tract. Absorption is uptake of nutrients, assimilation is incorporation into cells, digestion is breakdown of food.

Explanation:
Vitamin A (retinol) is crucial for the synthesis of rhodopsin, maintaining normal vision, especially in dim light. Vitamin D deficiency impairs calcium absorption, leading to rickets in children. Vitamin C (ascorbic acid) is a water-soluble vitamin, not fat-soluble; vitamins A, D, E, and K are fat-soluble. Thus, statements 1 and 3 are correct.