The ecological pyramid which can be inverted in a tree eco-system is

Consider the following statements concerning food chains:
(a) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation
(b) Removal of most of the carnivores resulted in an increased population of deer
(c) The length of food chains is generally limited to 3 - 4 trophic levels due to energy loss.
(d) The length of food chains may vary from 2 to 8 trophic levels.Which two of the above statements are correct?

The remains of the dead plants and animals is called

DDT residues are rapidly passed through food chain causing biomagnification because DDT is

The most recently discovered ecosystem is

The age of pyramid with broad base indicates

The more abundant animals in a desert grassland are

Assertion: In a food chain members of successive higher levels are fewer in number.

Reason: Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.

Assertion: Tropical rain forests are disappearing fast from developing countries such as India.

Reason: No value is attached to these forests because these are poor in biodiversity.

Which of the following is an example of man-made ecosystem?