The pigment that protects skin from UV radiation is: MCQ with Answer and Explanation

Explanation:
A food chain is a linear sequence showing the transfer of energy and matter from one organism to another through consumption. A food web is a complex, interconnected network of multiple food chains, representing the realistic feeding relationships in an ecosystem. Decomposers (bacteria and fungi) are saprotrophs that break down dead organic matter; primary producers are autotrophs (plants, algae) that synthesize their own food. Thus, statements 1 and 2 are correct.

Explanation:
In pisciculture, induced breeding is carried out by injecting fish with pituitary gland extract from donor fish containing gonadotropic hormones (FSH and LH), which stimulate spawning. This allows controlled production of fish seed. Hypophysation is the technique used in Indian major carps. Insulin and thyroxine are not involved in reproduction. Adrenaline is a stress hormone.

Explanation:
Lymphatic filariasis, caused by Wuchereria bancrofti and transmitted by Culex mosquito, leads to chronic swelling of limbs (elephantiasis) due to blockage of lymphatic vessels. Amoebiasis is Entamoeba, sleeping sickness Trypanosoma, kala-azar Leishmania.