Nutrition in Plants — Science STD 7 — Question

Why you are advised not to play with fireworks?

Silk is a good conductor of heat or poor conductor of heat?

Write word equations for two chemical reactions with the help of materials given in the box.
(Air, copper sulphate, iron, vinegar, iron oxide, carbon dioxide, iron sulphate, copper, lime water, water)

What is ductility?

Fill in the blanks:

The two regions of the earth with extreme climatic conditions are ___________ and __________.

Sponges and Hydra do not possess any circulatory system then how do they carry out distribution of food and other substances?

Fill in the blanks:
An image formed by a concave ___________ cannot be obtained on a screen.

Name the mode of transfer of heat in water or air.

In winter regions near, why does wind blow from land to sea?

How do Fungi, ferns and mosses reproduce?