Question

What is meant by ecological succession?

Answer 1

Wheat is an example of an endosperm. In non-endospermic seeds, the embryonic leaves (called cotyledons) take up most of the space in the seed and these cotyledons become filled with the material that will nourish the growing embryo. Thus, their food is not within the seed, but within the cotyledon.

Answer 2

Explanation:

A series of changes that leads to development of a stable climax community is called ecological succession. This is a unidirectional series of changes where a pioneer species which are usually bacteria, lichen etc gradually bring about changes in the ecosystem and make it suitable for successive species to inhabit the ecosystem. In this way at each stage the species make the environment suitable for their successors and finally reach a stage where the climax community is established i.e. the ecosystem of that place will not undergo any further change. Succession can be of two types depending on the region where the succession began, they are:

• Primary succession: This succession occurs in bare areas where no community existed ever before like volcanic islands.
• Secondary succession: This succession occurs in area  where a community existed previously but was destroyed by some natural means.

Further, Succession can be autogenic or allogenic, autotrophic or heterotrophic and progressive or retrogessive.