Which of the following levels is conceptual in terms of size?

How much portion of the Photosynthetically Active Radiation $(PAR)$ is captured by the plants (in $2-10\%$)?

What is the trophic level of bamboo plants in a forest ecosystem?

Given below is a list of autotrophs and heterotrophs. With your knowledge about food chain,establish various linkages between the organisms on the principle of 'eating and being eaten'. What is this inter-linkage established known as?
Algae,hydrilla,grasshopper,rat,squirrel,crow,maize plant,deer,rabbit,lizard,wolf,snake,peacock,phytoplankton,crustaceans,whale,tiger,lion,sparrow,duck,crane,cockroach,spider,toad,fish,leopard,elephant,goat,nymphae,spirogyra.

An ecosystem is a complex interacting system of

Herbivores are.....