Common Diseases In Human Beings

In the life cycle of Plasmodium (the malaria parasite), fertilization (syngamy) occurs in the midgut (stomach) of the female Anopheles mosquito.

Here, male and female gametocytes (from human blood) fuse to form a zygote, which develops into an ookinete and later into oocysts on the mosquito's gut wall.

• (A) Salivary glands: Sporozoites (infective stage) accumulate here but no fertilization occurs.
• (B) RBCs of humans: Gametocytes develop here but fertilization happens only in the mosquito.
• (D) Liver cells: Parasite undergoes asexual reproduction (schizogony), not fertilization.

• Ringworm is a fungal infection that primarily affects the skin.
• Other options like Dysentery (Protozoa affecting the liver), Typhoid (Bacteria affecting the lungs), and Filariasis (Common roundworm affecting the small intestine) are incorrect based on their respective pathogens and affected organs.

The correct answer is (B) : 2.