practice: energy flow #2
part 1: use the food web on the right to answer the following questions.
1. how many food chains make up this food web?
2. which organism(s) is an autotroph?
3. which organism(s) is an herbivore?
4. which organism(s) is an omnivore?
5. which organism(s) is a carnivore?
6. which organism(s) is a tertiary (3°) consumer?
7. which organism(s) belong to multiple trophic levels?
8. why does the hawk have less energy available to it than the snake?

Question

Accepted Answer

### Question 1
# Answer:
2
# Explanation:
## Step1: Identify food chains
A food chain shows the flow of energy from producers to consumers. The plant is the producer.
- First chain: Plant → Bird → Snake → Hawk
- Second chain: Plant → Caterpillar → Frog → Snake → Hawk
## Step2: Count the chains
By identifying the two distinct paths of energy flow, we find there are 2 food chains.

### Question 2
# Answer:
Plant
# Brief Explanations:
Autotrophs produce their own food (e.g., via photosynthesis). The plant is a producer, so it’s an autotroph.

### Question 3
# Answer:
Caterpillar, Bird
# Brief Explanations:
Herbivores eat plants. Caterpillar and Bird (assuming Bird eats plants here, from the food chain) consume the plant, so they are herbivores.

### Question 4
# Answer:
None (or check if any eat both; in this web, no clear omnivore)
# Brief Explanations:
Omnivores eat plants and animals. The organisms here (Plant, Caterpillar, Frog, Bird, Snake, Hawk) don’t show both plant - animal consumption, so no omnivore.

### Question 5
# Answer:
Frog, Snake, Hawk
# Brief Explanations:
Carnivores eat other animals. Frog eats Caterpillar, Snake eats Bird/Frog, Hawk eats Snake—all consume animals, so they are carnivores.

### Question 6
# Answer:
Hawk
# Brief Explanations:
Tertiary consumers are the third - level consumers (after producer, primary, secondary). In the chains: Plant (producer) → Caterpillar (primary) → Frog (secondary) → Snake (tertiary? Wait, no—wait, let's re - check. Wait, in the first chain: Plant (producer) → Bird (primary) → Snake (secondary) → Hawk (tertiary). In the second chain: Plant (producer) → Caterpillar (primary) → Frog (secondary) → Snake (tertiary) → Hawk (quaternary)? Wait, maybe I made a mistake. Wait, the question says tertiary ($3^{\circ}$). Let's re - analyze. Tertiary consumers are the third consumer in a chain. Wait, maybe the correct way: Producer (1st) → Primary (2nd) → Secondary (3rd) → Tertiary (4th)? No, trophic levels: Producer (level 1), Primary consumer (level 2), Secondary (level 3), Tertiary (level 4). Wait, maybe the problem considers tertiary as the third consumer. Let's take the first chain: Plant (1) → Bird (2) → Snake (3) → Hawk (4). So Hawk is tertiary? Wait, no, maybe the problem's definition. Alternatively, in the chain with Frog: Plant (1) → Caterpillar (2) → Frog (3) → Snake (4) → Hawk (5). So maybe the answer is Hawk, as it is the third - level consumer in the first chain (if we consider level 4 as tertiary? Maybe the problem simplifies. So Hawk is the tertiary consumer as it is the third consumer after the producer in the first chain (Plant → Bird → Snake → Hawk: Snake is secondary, Hawk is tertiary).

### Question 7
# Answer:
Snake
# Brief Explanations:
Snake is in two food chains: eats Bird (from one chain) and Frog (from another), so it occupies multiple trophic levels (secondary and tertiary consumer, depending on the chain).

### Question 8
# Answer:
Energy transfer is inefficient (10% rule)
# Brief Explanations:
Only ~10% of energy is transferred between trophic levels. The hawk is a higher - level consumer than the snake. Energy is lost (as heat, waste) at each level, so the hawk gets less energy than the snake (which is lower in the food chain).

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QUESTION IMAGE

Question

Explanation:

Question 1

Step1: Identify food chains

Step2: Count the chains

Question 2

Question 3

Question 4

Answer: