Heat Transfer in Nature — Science STD 7 — Question

Why loamy soil is known as best for growing plants?

State the cause of generation of wind.

In case you do not have a sewerage system in your locality, find out how sewage is being disposed off?

Define the term exhalation.

How many mirrors are used in a Kaleidoscope?

Give two examples for each of the following cases:
(a) Physical changes which are reversible.
(b) Physical changes which are not reversible.
(c) Chemical changes.

Some definitions are given below which can be corrected by changing one word. Correct them: The evaporation of water from oceans and its arrival back into oceans is called vapour cycle.

State whether the following statements are True or False. If false, correct them. Silkworms are caterpillars of silk moth.

How respiration does occur in plants?

Following statements describe the five steps in animal nutrition. Read each statement and give one word for each statement. Write the terms that describes each process. Breaking of complex food substances into simpler and soluble substances.