What is a greenhouse?

If $30 \mathrm{J}$ of energy is trapped by green plants, then how much green energy will be available to snake in the following chain?

Grass-Insect-Frog-Snake

Which of the following factors are important while understanding the process of energy flow?

$\left(\mathrm{i}\right)$ The efficiency of producers in absorption and conversion  of solar energy

$\left(\mathrm{ii}\right)$ Use of converted solar energy by consumers

$\left(\mathrm{iii}\right)$ The total input of energy in form of food and its efficiency of assimilation

$\left(\mathrm{iv}\right)$ The loss of energy through, respiration, heat and excretion

$\left(\mathrm{v}\right)$ The gross net production