Final Answer:
① A food chain starts with a
producer and ends with a
top predator. Green plants are called
producers because they use the light energy of the sun to produce food using carbon dioxide and water through a process called
photosynthesis. Animals cannot make their food and thus are called
consumers.
② There are
four main trophic levels in a food chain. They are
producers,
primary consumers,
secondary consumers, and
tertiary consumers. Apart from the said trophic levels,
producers have no natural predators except humans. Then,
decomposers, like fungi and bacteria, turn dead
organisms into inorganic materials in the soil.
1) Two longest food chains in the food web:
- Grass → Grasshopper → Shrew → Snake → Hawk
- Tree → Deer → Mountain Lion
(Other correct options include: Grass → Grasshopper → Rabbit → Snake → Mountain Lion; Shrubs → Squirrel → Snake → Hawk, etc., but the two above are among the longest with 5 steps.)
Parent Tip: Review the logic above to help your child master the concept of food web worksheet 4th grade.
