Reproduction in Plants — Science STD 7 — Question

What happens when a partially inflated balloon is placed in the Sun?

Which pigment makes green plants capable of utilising the solar energy?

In case you do not have a sewerage system in your locality, find out how sewage is being disposed off?

A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour. Are these changes chemical in nature?

What kind of image is formed by convex lens?

Some definitions are given below which can be corrected by changing one word. Correct them: The evaporation of water from oceans and its arrival back into oceans is called vapour cycle.

Why is it advised not to hold the thermometer by its bulb while reading it?

In which part of flower does fertilisation occur?

What is a clarifier?

How does growing pulses in the field help the soil?