Motion — Science STD 9 — Question

The best way to recover sugar form an aqueous sugar solution is:

1. Evaporation to dryness.
2. Distillation.
3. Filtration.
4. Crytallisation.

You are provided with a mixture of petroleum and water. You can separate this mixture by_____?

The process of cross breeding two different varieties of crop plants each having a desire characteristic, is known as:

1. Selection
2. Hybridization
3. Crossing
4. Introduction

The valence shell of calcium contains ___________?

Crop rotation can:

The cathode ray experiment was done for the first time by:

In water, the proportion of oxygen and hydrogen by mass is:

1. 1 : 4
2. 1 : 8
3. 4 : 1
4. 8 : 1

Phloem in the plants perform the function of:

Symbol of ______ is taken from Greek word Kalium.