Nocturnal animals like bats and owls have vision during night. Give reason.

In animals like bats and owls photoreceptor cells of the retina have mainly rods. a) What can you infer from this? b) Write down the function of rods and cons.

Cockroach is uricotelic animal. Give reason.

To get hard boiled eggs, common salt is added to water during boiling boiling. Give reasons.

The energy released during the addition of an electron to an isolated neutral atom is called electron gain enthalpy. a) Explain how electron gain enthalpy differ from electronegativity. b) The second ionisation enthalpy of an element is always greater than the first ionisation enthalpy. Give reason.

Why are very small animals rarely found in polar regions? Give reason.