Question

Answer the following questions/statements (each number should have a response):

1: Using the food chain below, match the organism with its trophic level. (U3L3)


____________ - Primary consumer

____________ - Producer

____________ - Tertiary consumer

____________ - Secondary consumer


2: Why is the sun the primary source of energy in most ecosystems? (U3L3)


3: Approximately how much energy is passed from one trophic level to the next? (U3L3)


4: How much energy would be passed from a producer containing 220,000 kilocalories of energy to the primary consumer? (U3L3)


5: Why are there fewer organisms at the top of the food chain? (U3L3)


6: _____________ and ___________ have important roles in the cycling of matter and energy in an ecosystem. The products of one are the reactants of the other. (U3L3)


7: Explain why both plants and animals need mitochondria. (U3L3)

Answer 1

1.

• Grass - Producer
• Grasshopper - Primary consumer
• Shrew - Secondary consumer
• Owl - Tertiary consumer

2. The sun is the primary source of energy in most ecosystems because it is the only source of energy that can be used by plants to make food through photosynthesis.

3. Only about 10% of the energy from one trophic level is passed to the next.

4. About 22,000 kilocalories of energy would be passed from a producer containing 220,000 kilocalories of energy to the primary consumer.

5. There are fewer organisms at the top of the food chain because energy is lost at each trophic level.

6. Decomposers and detritivores have important roles in the cycling of matter and energy in an ecosystem. The products of one are the reactants of the other.

7. Both plants and animals need mitochondria to convert food into energy. Mitochondria are the "powerhouses" of the cell and they produce ATP, which is the energy currency of the cell.