How do Organisms Reproduce? — Science STD 10 — Question

Name the organs of breathing in fish.

A farmer has found that the pH of soil in his fields is 4.2. Name any two chemical materials which he can mix with the soil to adjust its pH.

Where in the lungs does gas exchange take place?

State whether the following statements are true or false:

1. A wire with a green insulation is usually the live wire.
2. A miniature circuit breaker (MCB) works on the heating effect of current.

Name the type of cells that helps in blood clotting.

What will happen if we kill all the organisms in one trophic level?

If the length of a wire is doubled by taking more of wire, what happens to its resistance?

The highly reactive metals like Sodium, Potas-sium, Magnesium, etc. are extracted by the:

1. Electrolysis of their molten chloride.
2. Electrolysis of their molten oxides.
3. Reduction by aluminium.
4. Reduction by carbon.

Name the gas evolved when ethanoic acid is added to sodium carbonate. How would you prove the presence of this gas?