Sound — Science STD 8 — Question

What are genes? Where are genes located?

A glass rod is rubbed with a silk cloth. What type of charge is acquired by (a) silk cloth, (b) glass rod?

What type of reflection of light takes place from?

1. A rough surface?
2. A smooth surface?

Why is it is necessary to dry the harvested food grains before storage?

What is the difference between ‘flora’ and ‘fauna’?

What are the various practices necessary for raising animals for food and other purposes?

Explain how, noise pollution (or excessive loud noise) is harmful to human beings.

A, B, C and D are the basic part of all the cells. The part A contains threadlike structures called E which transfer the characteristic from parents to their off springs. The part B uses glucose and oxygen to produce energy whereas part C controls the movement of substance into the cell. The part D is a transparent, jelly-like material. What could A, B, C, D and E be?

What was the magnitude of Bhuj and Kashmir earthquakes on the Richter Scale?

What is the name of transparent front part of an eye?