Forests : Our Lifeline — Science STD 7 — Question

What colour does iodine turn in the presence of starch?

State the way through which we can prepare a pendulum by our own.

Name some places with severe soil erosion.

Some definitions are given below which can be corrected by changing one word. Correct them: The process of evaporation of water in the ground is called infiltration.

Explain the term humus that is generally found in the uppermost layer of soil.

Human blood group is divided into how many groups? Name them.

What is the site of cellular respiration?

Which acid is present in lemon juice?

Paheli participated in a 400m race competition held at her school and won the race. When she came home she had mixed feelings of joy and pain as she had cramps in her leg muscles. After a massage she was relieved of the pain. Answer the following questions related to the situation. What can be the possible reasons for the pain in her legs?

Define the term exhalation.