Light — Science STD 7 — Question

Which of the two is permanent change chemical change or physical change?

Fungus, moss and fern reproduce by a common method of asexual reproduction. Name the method.

What is the phenomenon that occurs when the Sun, Earth, and Moon align in a straight line?

To keep her soup warm, Paheli wrapped the container in which it was kept with a woollen clothes. Can she apply the same method to keep a glass of cold drink cool? Give reason for your answer.

Mention any two examples each of insulators as well as of conductors.

Give an example of chemical change in which heat, light, sound and unpleasant gases are produced.

How many types of elements are there?

State whether the following statements are True or False. If false, correct them.Yak hair are not used to make woollen fabric.

Consider the following organisms
Grass, birds, frog, crow, tiger, vulture, toadstool, deer.
Which of these
(i) can eat the dead animals?
(ii) can form a three step food chain?

Give the name of respiratory organs in following animals.

1. Fish.
2. Human being.