Consider statements about human excretion: 1. The kidneys regulate blood pressure. 2. Ammonia is the primary nitrogenous waste in humans. 3. The nephron filters blood in the glomerulus. Which are correct? MCQ with Answer and Explanation

Explanation:
Ammonotelic organisms excrete ammonia directly into water, which dilutes it. This is feasible for fishes. The reason correctly explains why they are ammonotelic.

Explanation:
The radicle is the embryonic root, emerging first during germination, and develops into the primary root system. The plumule develops into the shoot, hypocotyl is below cotyledons, epicotyl above cotyledons. The radicle grows downward (positively geotropic) to anchor and absorb water.

Explanation:
Collenchyma is a simple permanent tissue with living cells, unevenly thickened primary cell walls (cellulose and pectin), providing mechanical support and flexibility, especially in young stems and leaf petioles. Parenchyma is for storage and metabolism, sclerenchyma is dead, rigid with lignified walls, xylem conducts water.