1.
Copper alloys with tin to give

2.
Which one the following condition is not favourable for the formation of delta?

3.
In the Himalayas the melting or the snow is more on the

4.
Which of the following gives the correct decreasing order in numbers in the food chain pyramid?
1. Primary Producers
2. Herbivores
3. Carnivores
4. Man

5.
The trees of spruce, fir, pine, etc are found in which of the following natural regions of the Earth?