Food Chains and Food Webs

Rohan is exploring his backyard and finds mushrooms growing on a fallen log, earthworms in the soil, and mold on an old piece of bread. He wonders what kind of organisms these are examples of. What kind of organism is Rohan observing?

• Autotroph

• Heterotroph

• Decomposer

• Herbivore

Answer explanation

Rohan is observing decomposers, which include mushrooms, earthworms, and mold. These organisms break down dead organic matter, recycling nutrients back into the ecosystem, making 'Decomposer' the correct choice.

Aria is studying a plant in her garden. She notices that the plant uses sunlight, water, and carbon dioxide to make its own food and releases oxygen. The diagram shows what kind of organism Aria is observing?

• Autotroph

• Heterotroph

• Decomposer

• Herbivore

Answer explanation

Aria is observing an autotroph, as it uses sunlight, water, and carbon dioxide to produce its own food through photosynthesis, releasing oxygen as a byproduct.

Tags

NGSS.MS-LS1-6

While visiting the zoo, Aria noticed a group of animals like the ones in this image. She wondered what type of organisms they are in terms of how they get their food. The animals in this image are examples of _________________________ .

• Autotrophs

• Herbivores

• Producers

• Heterotrophs

Answer explanation

The animals Aria observed are classified as heterotrophs because they cannot produce their own food and instead obtain energy by consuming other organisms.

While visiting a wildlife park, Mia saw a giraffe eating leaves from a tall tree. The giraffe is an example of a _______________________________.

• Carnivore

• Omnivore

• Autotroph

• Herbivore

Answer explanation

The giraffe eats leaves, which makes it a herbivore, as herbivores primarily consume plants. Carnivores eat meat, omnivores eat both plants and animals, and autotrophs produce their own food.

Tags

NGSS.MS-LS2-1

While visiting a wildlife reserve, Evelyn observes a lion hunting and eating its prey. As a predator, this lion is also an example of a ______________.

• Producer

• Autotroph

• Carnivore

• Herbivore

Answer explanation

The lion is a carnivore because it hunts and eats other animals for food. Unlike producers and autotrophs, which create their own energy, and herbivores, which eat plants, carnivores specifically consume meat.

Tags

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Kai is walking in the forest and notices some mushrooms growing on a fallen log. He remembers that these mushrooms are heterotrophs and must therefore get nutrients from other organic matter. Mushrooms also act as ____________________ in many food webs.

• Herbivore

• Decomposer

• Carnivore

• Omnivore

Answer explanation

Mushrooms are heterotrophs that obtain nutrients from decaying organic matter. In ecosystems, they play a crucial role as decomposers, breaking down dead material and recycling nutrients, which is essential for food webs.

Tags

NGSS.MS-LS2-3

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Zoe is studying a food chain in her backyard. She observes that grass grows, a grasshopper eats the grass, and then a frog eats the grasshopper. In this food chain, the grass is the ______________.

• Primary Consumer

• Secondary Consumer

• Heterotroph

• Producer

Answer explanation

In the food chain, the grass is the source of energy for the grasshopper, making it a producer. Producers are organisms that create their own food through photosynthesis, while consumers rely on them for energy.

Tags

NGSS.MS-LS2-3

NGSS.MS-LS1-6

Aiden is studying a food chain in his backyard garden. He observes that grass grows, grasshoppers feed on the grass, frogs eat the grasshoppers, pythons prey on the frogs, and eagles hunt the pythons. The primary consumer in this food chain is the ____________.

• Frog

• Eagle

• Grasshopper

• Python

Answer explanation

In this food chain, the grasshopper is the primary consumer as it directly feeds on the grass (the producer). Frogs, pythons, and eagles are secondary consumers and higher, making the grasshopper the correct answer.

Kai is studying a food web in a grassland ecosystem for her science project. She wants to know which of the animals in this food web is a secondary consumer. Which animal should she choose?

• Hawk

• Lizard

• Mouse

• Snake

Answer explanation

In a grassland food web, secondary consumers eat primary consumers. The lizard feeds on insects (primary consumers), making it a secondary consumer. The hawk and snake are tertiary consumers, while the mouse is a primary consumer.

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-2

Arjun is studying a food web in a forest, as shown in the diagram. He wants to identify which animal in the web is a tertiary consumer. Which animal should Arjun choose?

• Jackal

• Wild Cat

• Lion

• Owl

Answer explanation

In a food web, tertiary consumers are typically top predators. The lion, being a large carnivore, preys on other animals and is thus classified as a tertiary consumer, making it the correct choice for Arjun.

Tags

NGSS.MS-LS2-3