In flood water environments, how are eggs typically deposited?

• A. Eggs are laid singly on damp soil
• B. Eggs are laid in clusters on vegetation
• C. Eggs are laid on water surface
• D. Eggs are buried underground

Answer: (A)

Mosquito eggs in flood-prone areas are adapted to survive dry periods and hatch when they are submerged. Depositing eggs singly on damp soil or debris that will later be covered by rising floodwaters lets each egg wait out the dry spell and then hatch en masse once the habitat fills with water. This strategy reduces competition among eggs and increases the chance that at least some will encounter suitable larval habitats when floods occur.

Eggs laid in clusters on vegetation would not align with flood-activated hatching, since moisture and water exposure patterns differ; eggs on the water surface would hatch as soon as water is present, not specifically after a flood prepares the habitat; and burying eggs underground would not reliably ensure contact with water to trigger hatching.