Learning Activity 3 (1)

Learning Activity 3

Name:___________________________ Date Submitted:_______
Year & Section:__________
Please use another sheet of paper for your answers.

I. APPLICATION. Answer what is being asked.
1. Draw and label a diagram of a food web of which you are a part. (20 points)

2. A pesticide called dichlorodiphenyltrichloroethane (DDT) is used to control
mosquitoes and other pests for agricultural purposes including those that spread
diseases, which was popularized in the 1900s. This substance was later found
out to be dangerous when consumed because it doesn’t break down easily.
Runoffs of this substance from farms are hitting the waterways, infiltrating the
aquatic plants and animals such as fishes. Meanwhile, a predator called bald
eagle usually prey on fishes. They are considered to be on top of the food chain.
However, they became endangered. Explain comprehensively why bald eagles
were the ones that were strongly affected by this substance. (20 points)

II. Multiple choices. Read each statement carefully. In CAPITAL letters, write
your answer from the choices given below on the space provided before each
number.

____1. Why is it unusual for a large number of organisms to be present at the top
of an ecological pyramid?
A. Animals at the top of the pyramid are the largest.
B. Animals at the top have shorter lives.
C. The amount of energy available by the time the top of the pyramid is reached
is not enough to sustain many individuals.
D. Humans are most interested in hunting animals occupying the top level of the
ecological pyramid.

____2. The biomass of an ecosystem is:
A. The total energy of living and nonliving components of the ecosystem.
B. The total energy of living organisms in an ecosystem.
C. The total mass of living and nonliving components of the ecosystem.
D. The total mass of living organisms in an ecosystem.

____3. If the producers in ecological pyramid have a total of 80000 Kcal of
energy, which of the following would be true?
A. The secondary consumers would have a total of 80 Kcal of energy.
B. The tertiary consumers would have a total of 8 Kcal of energy.
C. The secondary consumers would have a total of 80,000 Kcal of energy.
D. The tertiary consumers would have a total of 80 Kcal of energy.

____4. How many Kcal of energy does the producers make if the tertiary
consumers receive 100 Kcal of energy.
A. The producers would have a total of 1000 Kcal of energy.
B. The producers would have a total of 10 Kcal of energy.
C. The producers would have a total of 1,000,000 Kcal of energy.
D. The producers would have a total of 10,000 Kcal of energy.