Which one of the following statements is correct for secondary succession?

1.	It occurs on a deforested site
2.	It follows primary succession
3.	It is similar to primary succession except that it has a relatively slow pace
4.	All of the above

Stability of ecosystem depends upon:

1. Primary

2. Interchange between producers and consumers

3. Number of producers

4. Number of consumers

Intermediate community between pioneer and climax communities is called:

1. seral community

2. biotic community

3. temporary community

4. ecosure

Ten per cent law of energy transfer in a food chain is given by:

1. Schimper

2. Elton

3. Haeckel

4. Lindemann

Soil salinity is measured by:

1. Parameter

2. Calorimeter

3. Conductivity meter

4. Potometer

The ultimate source of energy for living beings is:

1. Sunlight

2. ATP

3. Fats

4. Carbohydrates

Which of the following species are restricted to an area?

1. Sympatric species

2. Sibling species

3. Allopatric species

4. Endemic species