Advertisements
Advertisements
प्रश्न
How is air useful to agriculture?
उत्तर
Air speeds up drying up of agricultural products like grains, pulses fruits, etc. Air helps in the pollination of flowers and dispersal of seeds.
APPEARS IN
संबंधित प्रश्न
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. |
(a) Oxygen |
| 2. A gas used for filling weather observation balloons. | (b) carbon acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphur acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
Give two uses of the following component present in air:
water vapour
Name the processes which maintain the balance between oxygen and carbon dioxide in the air. How is it done?
Tick (√) the correct alternative from the choice given for the following statement.
Fuels which do not leave any residue on burning are
A mixture has a variable composition. Give three other reasons why air is considered a mixture and not a compound.
______ soil has pH 7.
What is the importance of air in transmission of sound?
The composition of air is always exactly the same.
Do sailors need the help of wind to sail?
Match the items of Column I with the items of Column II
| Column-I | Column-ll | ||
| (a) | Weather cock | (i) | Gases and fine dust particles |
| (b) | Mountaineers | (ii) | Sailing yacht |
| (c) | Fine hair inside the nose | (iii) | Oxygen cylinders |
| (d) | Smoke | (iv) | Direction of airflow |
| (e) | Wind | (v) | Prevent dust particles |
