Question

Grass à Grasshopper à Frog à Snakeà Eagle In the above food chain if Eagle gets .02J of energy, how much solar energy does the grass receive?

Answer 1

The amount of energy received by grass would be 2000 joules

Explanation:

Since, we know that energy is required at each trophic level either it is a producer or a consumer. Most of the energy is utilized in digestion and other body works like movement, respiration etc. Some amount is wasted and the remaining energy is passed on to next trophic level.

Therefore, according to the rule of ten percent, only ten percent of the energy passes on to next trophic level. Thus, if eagle receives 0.2 j of energy than,

Grass → Grasshopper → Frog → Snake → Eagle

2000     →       200      → 20    →     2    →   0.2

Answer 2

The grass receives 200J of the solar energy.

• According to the 10℅ law of energy transfer given by Lindeman, only 10℅ of the energy gets transferred from one trophic level to the next, the rest of which is lost.

Here, the food chain is:

Grass--> Grasshopper---> Frog---> Snake--->  Eagle

• So, energy progressively reduces from left to right and increases from right to left.

[ Energy gets divided by 10 from left to right and multiplied by 10 from right to left]

• If eagle gets 0.02J of energy, the snake will get 0.2J, frog will get 2J, grasshopper will get 20J and the grass will get 200J of energy.