Question

practice: energy flow #1
answer the following questions about the food web below.
1 which organism(s) are producers?
2 which organism(s) are autotrophs?
3 which organism(s) are herbivores?
4 which organism(s) are carnivores?
5 which organism(s) are omnivores?
6 which type of heterotroph is missing from this food web?
7 which organism would be at the top of the trophic pyramid?
8 what does the arrow going from the grass to the grasshopper mean? why do the arrows only go in one direction?
9 choose one food chain from the food web above. draw it in the space below. then create a trophic pyramid of it. be sure to label the trophic level number, name, and amount of energy available at each level.

1. come up with your own food chain below. include at least 3 organisms, one of which should be a human. then create a trophic pyramid. be sure to label the trophic level number, name, and amount of energy available at each level

Explanation:

For each question, we analyze the food web components (producers, consumers, energy flow) and use concepts from ecology (part of Biology, Natural Science) such as trophic levels, energy transfer (10% rule), types of organisms (producers, autotrophs, herbivores, carnivores, omnivores, decomposers) and unidirectional energy flow. We identify organisms based on their role in the food web (what they eat or are eaten by) and apply ecological principles to answer about energy flow, missing components, and trophic pyramids.

Answer:

Question 1

Producers: Plants (grass, the green leafy plant, the lily pad - like plant)

Question 2

Autotrophs: Same as producers (grass, the green leafy plant, the lily pad - like plant) (Autotrophs are organisms that make their own food, usually via photosynthesis, like plants)

Question 3

Herbivores: Grasshopper, Caterpillar, Butterfly (These organisms eat plants)

Question 4

Carnivores: Owl, Lizard (These organisms eat other animals)

Question 5

Omnivores: Mouse (Mice can eat both plants and animals, from the food web context)

Question 6

Missing heterotroph: Decomposers (Decomposers break down dead organic matter and are not shown in the food web)

Question 7

Top of trophic pyramid: Owl (It is at the highest trophic level, with no organisms shown eating it)

Question 8

Arrow meaning: The arrow from grass to grasshopper means that the grasshopper eats the grass (energy flow from grass to grasshopper). Arrows go one direction because energy flow in a food web is unidirectional (energy is transferred from one organism to the next as one is eaten, and energy is lost as heat at each trophic level, so it can't flow back)

Question 9

Example food chain: Grass → Grasshopper → Lizard → Owl. Trophic pyramid:

• Level 1: Producer (Grass), Energy: 1000 kcal (assumed, as producers start with the most energy)
• Level 2: Primary Consumer (Grasshopper), Energy: 100 kcal (10% of 1000, due to 10% energy transfer rule)
• Level 3: Secondary Consumer (Lizard), Energy: 10 kcal (10% of 100)
• Level 4: Tertiary Consumer (Owl), Energy: 1 kcal (10% of 10)

Question 10

Example food chain: Wheat → Human → Wolf (but to include a human with at least 3 organisms: Wheat (Producer) → Human (Primary/Secondary Consumer) → Wolf (Tertiary Consumer)). Trophic pyramid:

• Level 1: Producer (Wheat), Energy: 1000 kcal
• Level 2: Consumer (Human, if eating wheat), Energy: 100 kcal
• Level 3: Consumer (Wolf, eating human), Energy: 10 kcal

(Note: In a more typical human food chain, humans might be omnivores, but this is a simplified example)