Improvement in Food Resources — Science STD 9 — Question

Two different bodies are completely immersed in water and undergo the same loss in weight. Is it necessary that their weights in air should also be the same? Explain.

Group the following and tabulate them as energy yielding, protein yielding, oil yielding and fodder crop.
Wheat, rice, berseem, maize, gram, oat, pigeon gram, sudan grass, lentil, soyabean, groundnut, castor and mustard.

A racing car has a uniform acceleration of 4ms^-2. What distance will it cover in 10s after start?

Describe the essential properties of the atomic nucleus. Compare these with the properties of the electron.

Name the complex tissue which helps in:

1. Conduction of water and minerals.
2. Conduction/ transport of food.

Give two reasons to justify that:
An iron almirah is a solid.

Give an example each for the mixture having the following characteristics. Suggest a suitable method to separate the components of these mixtures:
Two volatile components with appreciable difference in boiling points.

Why does all the water of the earth not get evaporated during hot summer days?