What provides the energy which then flows through a food chain?

Name and state the law given by Lindeman which tells us how much energy entering a particular trophic level of organisms is available for transfer to the next higher trophic level.

How much energy will be available to hawks in the food chain comprising hawk, snake, paddy and mice, if 10,000 J of energy is available to paddy from the sun?

Which pollutant released into the air during refrigeration and air-conditioning is the greatest contributor to the depletion of ozone layer?

In the food chain given below, if the amount of energy available at fourth trophic level is 5 kJ, what was the energy available at the producer level?

GrassGrasshopper Frog Snake Hawk