निम्नलिखित में से किसे पारिस्थितिकी तंत्र में एक प्राथमिक गैसीय जैव-भू-रासायनिक चक्र (biogeochemical cycle) नहीं माना जाता है?

Ecological pyramids represent the relationship between organisms at different trophic levels. For which of the following is the pyramid generally inverted?

What is the term used for animals that convert plant biomass into animal biomass?

Identify the correct sequence of the terrestrial food chain.