Improvement In Food Resources — Science STD 9 — Question

How does excessive irrigation lead to soil salinity?

Give name of one improved crossbreed cows.

Is energy a vector quantity?

Where are smooth muscle tissues located in the body?

Name the following.
Tissue that transports food in plants.

Which of the following are ‘pure substance’?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air.

Each beehive consists of thousands of hexagonal thin-walled fragile cells. Name the material which is used to make these cells and mention the significance of the hexagonal shape of the cell.

Write down the formulae for the following compounds:
Magnesium hydroxide

A coverslip must always be places very gently while mounting in order to:

1. Avoid the entry of air bubbles.
2. Stop the stain from oozing out.
3. Avoid crushing of the material.
4. Stop the material from drying.