Heat Transfer in Nature — Science STD 7 — Question

Algae and fungi form a unique association sharing benefits from each other. What is the name of association between them?

What are the harmful effects of acid rain?

Why are trees planted alongside the roads?

Why do we wear light coloured cotton clothes when it is hot?

Take a glass prism. Allow a narrow beam of sunlight to pass through a small hole in the window of a dark room to fall on one face of the prism, what will happen to the light?

There are several elements of weather. The weather report carries the information about which of the elements of weather?

Fill in the blanks in the following statements. Silk fibres come from _______ of silk _______.

Name the source from which litmus solution is obtained. What is the use of this solution?

State whether the following statements are True or False. If false, write the correct statement: Water vapour is the gaseous form of water.

A burning incense stick is fixed, pointing downwards. In which direction would the smoke from the incense stick move? Show the movement of smoke with a diagram.