Lakhmir Singh and Manjit Kaur Solutions for Chapter: Our Environment, Exercise 8: Long Answer Type Questions

With the help of a flow diagram, describe how energy from the sun flows through various trophic levels.

What is UNEP? What step has been taken by UNEP in 1987 to prevent too much damage to the ozone layer?

How is energy introduced into the ecosystem?

Consider the following food chains :

(i) Plants $\to$ Mice $\to$ Snakes $\to$ Hawks

(ii) Plants $\to$ Mice $\to$ Hawks

If energy available at the producer level in both the food chains is 100 J, in which case will hawks get more energy as food and by how much? Justify your answer.

Explain why, a food chain usually cannot have more than three or four steps.

Calculate the amount of energy that will be available to big fish in the following food chain, if $10,000J$ of energy is available to small algae from the sun:
Small algae $\to$ Zooplankton $\to$ Fish $\to$ Big fish(0.1J/10 J/100J/1000J)

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 10,000J of energy is available to paddy from the sun? (100/ 10/ 1/ 0.1/ 0.01)