Transportation in Animals and Plants — Science STD 7 — Question

Define an electric circuit and give symbols of two electrical components.

Define Photosynthesis.

Draw a diagram to show the different layers of soil.

Last Sunday, Pooja on her week off entered in her kitchen to cook rice for her family in lunch time. The moment she put fry pan on the gas stove and lighted it through the matchstick, all of sudden her 5 years small daughter entered into the kitchen and tends to touch the hot fry pan. At the same time, Pooja saw her and pushed her away from the hot fry pan. In this way, she saved her child.
(i) Explain why are the fry pan provided with the plastic handles?
(ii) Mention the values represented by Pooja here towards her 5 years small daughter.

If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think formation of rust on iron is a chemical change?

How do plants get their food?

What are the features of an ideal uniform motion?

What would happen if the mucus lining in the stomach were absent?

We can see objects when the lighted reflected from the objects falls upon our eyes. Why can't walls act as mirror even the light is reflected through walls and reach our eyes?

What is a neutralisation reaction? Give an example.