Worksheet

Section A: Multiple Choice Questions (1 Mark each)

Choose the most appropriate option for each question.

  1. Which trophic level always has the maximum energy in a food chain?
    (a) Producers
    (b) Primary Consumers
    (c) Secondary Consumers
    (d) Tertiary Consumers

  2. The accumulation of non-biodegradable chemicals in the tissues of organisms at successive trophic levels is called:
    (a) Eutrophication
    (b) Food Web
    (c) Biological Magnification
    (d) 10% Law

  3. The main compound responsible for the depletion of the ozone layer is:
    (a) Carbon Dioxide (CO₂)
    (b) Sulphur Dioxide (SO₂)
    (c) Methane (CH₄)
    (d) Chlorofluorocarbons (CFCs)

  4. Which of the following is an example of an artificial ecosystem?
    (a) Forest
    (b) Lake
    (c) Aquarium
    (d) Grassland

  5. If the energy available at the producer level is 10000 J, according to the 10% law, how much energy will be available to the secondary consumer?
    (a) 100 J
    (b) 1000 J
    (c) 10 J
    (d) 1 J

Section B: Short Answer Questions (2 Marks each)

  1. Define Ecosystem. Differentiate between the two main components of an ecosystem.

  2. What is the role of decomposers in the environment? Give two examples.

  3. Differentiate between biodegradable and non-biodegradable substances with one example of each.

  4. Explain the statement: "Energy flow in a food chain is unidirectional."

Section C: Long Answer Questions (3 Marks each)

  1. Damage to the ozone layer is a cause for concern. Justify this statement and suggest two steps that have been taken to limit this damage.

  2. Construct a terrestrial food chain of four trophic levels. If 500 kJ of energy is available at the producer level, calculate the energy available at the fourth trophic level.

  3. We often generate a large amount of waste. List three ways you can personally help in reducing the problem of waste disposal in your daily life.


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