In most ecosystems `:`

All these statements about trophic levels and ecosystems are false except. (a) Trophic level represents a functional level, not a species as such (b) A given species never occupies more than one trophic level in the same ecosystem at the same time (c) In most ecosystems , producers are less in number and biomass than the herbivores (d) Pyramid of energy can never be upright .

Assertion: In most ecosystem , all the pyramids, of number, energy and biomass are upright. Reason: In a food chain producers are more in number and biomass than the herbivores, and herbivores are more in number and biomass and carnivores.

A glass dome covering an area of 3-5 acres with 4000 representatives of most ecosystems and eight human beings in order to prepare a prototype of space colony is

Which of the following is most stable ecosystem ?

Which of the following is most stable ecosystem ?

Which of the following is most stable ecosystem ?

Which of the following is most stable ecosystem ?