2. Most of the weather phenomenon take place in the _______________________.
3. On the day when the Sun is nearest to the earth the earth is said to be _______________________________.
4. The leguminous plants are important in agriculture because they __________________________________.
[B]Need very little water to grow
[C]Have a short life-cycle
[D]Help in nitrogen economy of the plants
5. The energy released when one mole of an element in the form of gaseous atoms is converted into negative ions is called ______________________.