The silkworm used in sericulture is the larva of: MCQ with Answer and Explanation

Explanation:
Bacterial cell walls contain peptidoglycan (murein), a unique polymer that maintains cell shape and protects against osmotic pressure. The reason correctly explains why peptidoglycan is essential.

Explanation:
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain constant (in equilibrium) from generation to generation in the absence of evolutionary influences. The conditions required for this equilibrium are: no mutation, random mating, no gene flow (migration), very large population size (no genetic drift), and no natural selection. Therefore, random mating is a condition that MAINTAINS the equilibrium, not a factor that disrupts it. Non-random mating would disrupt it.

Explanation:
Urobilin (urochrome) is a breakdown product of bilirubin, giving urine its characteristic yellow color. Bilirubin is in bile, hemoglobin in red blood cells, melanin in skin. Dark yellow urine indicates concentrated urine due to dehydration.