Winds, Storms and Cyclones — Science STD 7 — Question

An electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response.

Explain the digestion process in Amoeba with the help of diagram.

Rahul was observing the sky one evening when he noticed that the Sun appeared to set in the western sky. The next day, his friend told him that the Earth rotates from west to east, which is why the Sun rises in the east and sets in the west. Rahul was curious and asked his teacher how this phenomenon happens.
(i) Why does the Sun appear to rise in the east and set in the west?
(ii) How does the Earth’s rotation affect the appearance of the Sun in the sky?
(iii) What is the reason for the Sun’s movement across the sky?

Mention three causes of water scarcity in our country.

One day, a five years old boy, Chintoo was playing with his toys in his room. After few minutes, he saw a wristwatch on his study table, so after seeing it, he got crazy and so much eager to play with that watch. Then, for 2 to 3 min, he was trying to analyse it that whether its a toy or something else, then suddenly, he was just about to throw it but at the same his mother entered into the room and took the watch back immediately from his hand.
(i) State the benefits of a wristwatch.
(ii) Briefly mention the values showed by Chintoo's mother here.

Explain the function of bar screens in a wastewater treatment plant.

Describe the effects of heat.

Explain sea breeze.

Explain the two mode of nutrition in plants.