Diversity In Living Organisms — Science STD 9 — Question

What do we call those particles which have:
Less electrons than the normal atoms?

The mass per unit volume of a substance is called density. (density = mass/volume). Arrange the following in order of increasing density– air, exhaust from chimneys, honey, water, chalk, cotton and iron.

State the value of universal gravitational constant. What was its value back in 1947?

Name five appliances or machines which use an electric motor.

Name two sound absorbing materials (or objects) which can make our big room less echoey.

_________ is a method of control of pest or weed in which one living organism is used to control another living organism is used to control another living organisms.

Mention one advantage of crop rotation.

Compare an electron, a proton and a neutron in respect of their relative masses and charges.

Name the muscle which is commonly found in visceral organs.