Work, Power And Energy — Science STD 9 — Question

What name is given to the amount of substance containing this number of atoms?

What is the other name of buoyant force?

Name the central part of an atom where protons and neutrons are held together.

Name one cause of non-communicable diseases.

What is botanical name of wheat?

A satellite goes round the earth in a circular orbit with constant speed. Is the motion uniform or accelerated?  This photograph shows a man-made 'communication satellite' going round the earth in a circular orbit (or circular path). We can see the dish antennae and solar panels (made of solar cells) clearly in this photograph.  This photograph shows a watch. The tip of seconds 'hand of this watch moves rapidly on the dial of the watch. The tips of minutes' hand and hours' also move on the dial but they move slowly.

Name the organelles which show the analogy written as under Transporting channels of the cell.

Which type of simple tissue of plants os used for making ropes?

To solve the food problem of the country, which among the following is necessary?