The lymphatic system consists of lymph, lymph nodes, and: MCQ with Answer and Explanation

Explanation:
The human heart is a four-chambered muscular organ consisting of two upper atria (receiving chambers) and two lower ventricles (discharging chambers), ensuring complete separation of oxygenated and deoxygenated blood. The lungs are a pair of spongy, air-filled organs located on either side of the chest, serving as the primary site for gas exchange (respiration). The brain, the control center of the nervous system, is encased and protected by the bony cranium (skull). All statements are correct.

Explanation:
Ginger is a rhizome, an underground modified stem growing horizontally, bearing nodes, internodes, scale leaves, and buds. Potato is a tuber, gladiolus a corm, onion a bulb (modified stem with fleshy leaf bases). Rhizomes store food and aid vegetative propagation.

Explanation:
The left ventricle has the thickest and most muscular wall of all the heart chambers. This is because it must pump oxygenated blood with high pressure through the aorta to supply the entire systemic circulation of the body. The right ventricle only pumps blood to the lungs, which requires much less pressure.