A food chain shows 'what eat whats'.
What does the arrow in the food chain represent?
Important Questions on Ecology
Juan says: 'All the energy in a food chain comes from the sun'.
Explain why this statement is true.
The diagram below shows a food web.
a) Use the food web to draw a food chain that has four trophic levels.
b) All the frogs in the food web die of a disease. Explain what will happen to the size of the population of snails.
Complete the table to show what resources organisms need to survive. Add one cross (X) to each row. The first row has been done for you.
| Resource | Plants | Animals | Both plants and animals |
| Sunlight | X | ||
| Water | |||
| A source of food | |||
| Carbon dioxide |
The barrel cactus grows in the desert. The plant is adapted to live in the desert. Explain how each adaptation helps the barrel cactus to survive.
Large swollen stem: _____
The barrel cactus grows in the desert. The plant is adapted to live in the desert. Explain how each adaptation helps the barrel cactus to survive.
Thick spines rather than leaves: _____
