Question

Regarding the given assertion and reason, choose the right option

Assertion [A]: Primary succession occurs in a freshly harvested field.
Reason [R]: Successsion always occurs over a bare area.

• A. A and R are true, and R explains A
• B. A and R are true, and R does not explain A
• C. A is true and R is false
• D. Both A and R are false

Answer 1

The correct option is D Both A and R are false

The gradual and fairly predictable change in the species composition of a given area is called ecological succession. Ecological succession are of two different types- primary and secondary succession. Primary succession occurs in essentially lifeless areas in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. Secondary succession begins in areas where natural biotic communities have been destroyed such as in abandoned farm lands, burned or cut forests, lands that have been flooded. Succession takes place, both in bare areas and on previously inhabited disturbed or damaged habitat, and is known as primary and secondary succession respectively.