Question

3 look at this food web. then answer the questions.
a name two producers in the food web.
b name three consumers in the food web.
c write a food chain from this food web with six trophic levels.
d name the animals that the small fish eats.
e name the animals that eat the small fish.
f explain what could happen to the community if all the frogs suddenly died.

Explanation:

Part a

Producers are organisms that can make their own food through photosynthesis (or chemosynthesis, but in this food web, it's photosynthetic plants). Looking at the food web, land plants and tiny water plants are the ones that produce food.

Consumers are organisms that eat other organisms. From the food web, slug (eats land plants), insect (eats land plants), and frog (eats insect) are all consumers.

A trophic level is each step in a food chain. We need to find a chain with six levels. Let's start with a producer (tiny water plants), then primary consumer (water fleas), secondary (diving beetle), tertiary (small fish), quaternary (perch), quinary (heron). Wait, no, let's check again. Wait, tiny water plants → water fleas → diving beetle → small fish → perch → heron? Wait, no, let's count the levels. Producer (1), primary (2), secondary (3), tertiary (4), quaternary (5), quinary (6). Wait, maybe tiny water plants → water fleas → diving beetle → small fish → heron? No, that's 5. Wait, let's look at the arrows. Tiny water plants → water fleas → diving beetle → small fish → perch → heron. Let's check the arrows: tiny water plants are eaten by water fleas, water fleas by diving beetle, diving beetle by small fish, small fish by perch, perch by heron. Wait, but small fish also eat water fleas? Wait, the diagram: water fleas are eaten by diving beetle and newt? Wait, no, the arrows: tiny water plants → water fleas (arrow from tiny water plants to water fleas), water fleas → diving beetle (arrow from water fleas to diving beetle), diving beetle → small fish (arrow from diving beetle to small fish), small fish → perch (arrow from small fish to perch), perch → heron (arrow from perch to heron). Wait, but that's 5 levels (producer, 4 consumers). Wait, maybe tiny water plants → water fleas → newt → small fish → perch → heron? Wait, newt eats tiny water plants? No, newt's arrow: tiny water plants → newt? Wait, the diagram: tiny water plants have an arrow to newt? Wait, the user's diagram: tiny water plants → water fleas (arrow), tiny water plants → newt (arrow)? Wait, looking at the diagram: tiny water plants have arrows to water fleas and newt? Then water fleas → diving beetle, newt → small fish, diving beetle → small fish, small fish → perch, perch → heron, small fish → heron? Wait, maybe a better chain: land plants → insect → frog → heron? No, that's 4. Wait, land plants → slug → frog → heron? No. Wait, tiny water plants → water fleas → diving beetle → small fish → heron →? No, heron is eaten by? No, the fox eats frog and heron? Wait, fox has arrows from slug and frog? Wait, the diagram: fox has an arrow from slug (slug → fox) and frog (frog → fox), heron has arrow from frog (frog → heron) and perch (perch → heron), perch has arrow from small fish (small fish → perch), small fish has arrows from diving beetle (diving beetle → small fish) and newt (newt → small fish), diving beetle has arrow from water fleas (water fleas → diving beetle), newt has arrow from tiny water plants (tiny water plants → newt), water fleas has arrow from tiny water plants (tiny water plants → water fleas), insect has arrow from land plants (land plants → insect), frog has arrow from insect (insect → frog) and diving beetle (diving beetle → frog)? Wait, maybe I misread. Let's re - examine:

• Land plants: eaten by slug and insect.
• Tiny water plants: eaten by water fleas and newt.
• Water fleas: eaten by diving beetle.
• Newt: eaten by small fish.
• Diving beetle: eaten by frog and small fish.
• Insect: eaten by frog.
• Slug: eaten by fox.
• Frog: eaten by fox and heron.
• Small fish: eaten by perch and heron.
• Perch: eaten by heron.
• Heron:? (No arrow out, maybe top predator)
• Fox: top predator?

So to get six trophic levels: tiny water plants (producer, level 1) → water fleas (primary consumer, level 2) → diving beetle (secondary consumer, level 3) → small fish (tertiary consumer, level 4) → perch (quaternary consumer, level 5) → heron (quinary consumer, level…

Answer:

land plants, tiny water plants

Part b