Plasma bilirubin

Correct Answer: C

Rationale: Bilirubin, a heme breakdown product, is protein-bound and does not cross the blood-brain barrier under normal conditions.

Correct Answer: D

Rationale: Isotonic (5%) dextrose expands ICF and ECF as it's metabolized, leaving water to distribute across compartments.

Correct Answer: C

Rationale: Hyperventilation (e.g., altitude) lowers PCO2, raising pH and causing tetany; pH > 7.45 in uncompensated cases.

Correct Answer: D

Rationale: Hypercalcemia (e.g., from hyperparathyroidism) increases urinary stone risk; it reduces excitability.

Correct Answer: C

Rationale: Epidermis is the outermost layer of cells in a plant which protect the plant from injury, adverse conditions, to reduce water loss, in gaseous exchange and transpiration with the help of stomata. Xylem helps in Conduction of water.