Human and Social Biology Form 3

Form 3 HUMAN AND SOCIAL BIOLOGY Trinity            WEEK: May 18 – 22

Teacher: Leon Abel                                                                  Email: leonabel8@gmail.com

Topic: Nutrient Cycles – Answer ALL the following questions:

1.     State then explain the effect that each of the following has on the concentration of carbon dioxide in the atmosphere.

a.      the burning of fossil fuels

b.     an increase in the rate of photosynthesis of plants

c.      a shift from the use of coal to the use of nuclear power in power stations.

2.     Name two harmful gases that are released by burning fossil fuels.

3.     Suggest two ways in which global warming might be halted or even reversed.

4.     Apart from protein, name one other important molecule in the body that contains nitrogen.

5.     Sugar cane is a crop that is harvested and removed from the field. Why do farmers need to add fertilizers to the soil?

You may use the following video to assist you: