LESSON TOPIC:
ENERGY FLOW, FOOD CHAINS AND WEBS
TIME: 45
MINUTES
DATE: 15 FEBRUARY 2016
FOOD WEBS
·
When there are many food
chains with common links, they can be joined to form a food web. A food web
shows the interactions one organism may have with many other organisms.
ECOLOGICAL PYRAMID OF
ENERGY
•In an energy
pyramid we see that locusts feed on plants and that it takes many locusts
to provide enough food for a mouse. The base of the pyramid is wider than
the top and represents the number of producers.
•The next layer
represents the number of consumers at that trophic level.
•As you move
towards the top of the pyramid, you will find the number of consumers decrease
DATE:
15 FEBRUARY 2016
Food
chains and food webs
HOME WORK
Figure below represents a food web for a game farm. Look
carefully at the food web and answer the questions.
1. Use the food web to identify one example of a:
A) predator
b) Consumer
c) Producer
d) Tertiary consumer
e) Herbivore
f) Carnivore
g) Secondary consumer.
2. If the red grass were removed from the habit, explain
how the food web would be affected.
3. Suggest why the number of black mamba might decrease if
the Guinea fowl all died from a disease. Explain your reasoning.
TOTAL: 20 marks
