In an ecosystem, there is flow of energy at different trophic levels. This is as follows :

Flow of energy declines from low to higher trophic level in ecosystem, is mainly explained by

In what order do a hawk, grass and rabbit form a food chain in a meadow?

Consider the following statements about food chain

$I.$ The transfer of energy from producers to top consumers through a series of organisms is called food chain

$II.$ A food chain is always straight and proceeds in a progressive straight line

$III.$ In a food chain, there is unidirectional flow of energy from sun to producers and subsequently to series of different types of consumers

Which of the statements given above are correct?

What is the percentage of photosynthetically active radiation $(PAR)$, in the incident solar radiation.