Life Processes — Science STD 10 — Question

Write the structural formula of propyne.

Find resemblance between hydrogen and alkali metals by writing compounds of both with chlorine, sulphur and oxygen.

What is pedicel?

You know that as we go higher than the sea level, the boiling point of water decreases. What would be the effect on the melting point of a solid?

Name the law which is illustrated by the above V-I graph.

Why does absorption of digested food occur mainly in the small intestine?

Atmospheric refraction causes advance sunrise and delayed sunset. By how much time is:

1. Sunrise advanced?
2. Sunset delayed?

Why is an iron grill painted frequently?

What is meant by ‘a family of salts’? Explain with examples.

What does a plant root do in response to water? What is this phenomenon known as?