Why is a white dress more comfortable than a dark dress in summer?

Why do aquatic species feel more comfortable in the lakes in winter than in summer ?

Cutting onions taken from the fridge is more comfortable than cutting those lying a room temperture. Explain why.

A person has a white shirt and a black shirt. Which shirt will make him more comfortable in summer? Give reasons for your answer.

White clothes are more comfortable in summer while coloured clothes are more comfortable in winter. Why?

John is always shabbity dressed .

Statement: I. Mud houses are cooler in summers than stone-and-brick houses. II. Mud houses are occupied by the poor only. Conclusions: I. Poor people are more comfortable in summers than the rich. II. Stone-and-brick houses are more sophisticated than mud houses.