💡 6th Grade Other: Food Chain And Food Web Practice Questions
1
Solved Example
Easy Level
💡 Look at the simple food chain below:
Grass 👉 Rabbit 👉 Fox
Identify the role of each organism in this food chain: producer, primary consumer, or secondary consumer.
Solution & Explanation
Here's how to identify the role of each organism:
Grass: The grass is the producer. Producers make their own food, usually through photosynthesis, and form the base of the food chain. 🌿
Rabbit: The rabbit is the primary consumer. Primary consumers are herbivores that eat producers. Rabbits eat grass. 🥕
Fox: The fox is the secondary consumer. Secondary consumers are carnivores or omnivores that eat primary consumers. Foxes eat rabbits. 🦊
✅ Key Takeaway: Energy flows from producers to consumers!
2
Solved Example
Easy Level
📌 Match the following terms with their correct definitions:
Producer
Consumer
Decomposer
Definitions:
A) An organism that gets energy by eating other organisms.
B) An organism that breaks down dead organic matter, returning nutrients to the soil.
C) An organism that makes its own food, usually using energy from the sun.
Solution & Explanation
Let's match each term to its definition:
1. Producer: Matches with C) An organism that makes its own food, usually using energy from the sun. Think of plants! 🌱
2. Consumer: Matches with A) An organism that gets energy by eating other organisms. Animals are consumers! 🦁
3. Decomposer: Matches with B) An organism that breaks down dead organic matter, returning nutrients to the soil. Fungi and bacteria are great examples! 🍄
✅ Understanding these roles is fundamental to understanding ecosystems.
3
Solved Example
Medium Level
💡 Consider the following organisms: Sun, Algae, Small Fish, Heron.
Draw a food chain using these organisms and show the direction of energy flow with arrows.
Solution & Explanation
Here's the food chain showing the flow of energy:
Sun energy ➡️ Algae ➡️ Small Fish ➡️ Heron
The Sun provides the initial energy. ☀️
Algae (a producer) uses sunlight to make its food. 🌿
Small Fish (a primary consumer) eats the algae. 🐟
Heron (a secondary consumer) eats the small fish. 🦅
✅ Remember: The arrows always point in the direction the energy is moving, from the organism being eaten to the organism that eats it.
4
Solved Example
Medium Level
Imagine a food chain in a forest: Trees 👉 Deer 👉 Wolves.
What would likely happen to the population of deer and trees if the population of wolves suddenly decreased significantly (e.g., due to disease)?
Solution & Explanation
Let's break down the impact on each population:
Impact on Deer Population:
If the number of wolves (the predators of deer) decreases, fewer deer will be hunted and eaten. This would likely lead to an increase in the deer population. 📈
Impact on Tree Population:
With an increased deer population, there would be more deer eating the trees (their food source). This increased grazing would likely lead to a decrease in the tree population, especially young saplings. 📉
✅ This shows how all parts of a food chain are interconnected. A change in one population can have a ripple effect throughout the ecosystem.
5
Solved Example
Real World Example
Think about your own diet. Describe a food chain that includes you as a consumer, starting with a producer.
Solution & Explanation
Here's an example of a food chain involving me as a consumer:
Corn Plant 👉 Chicken 👉 Human (eating chicken nuggets!)
Corn Plant: This is the producer. It makes its own food using sunlight. 🌽
Chicken: This is the primary consumer. It eats the corn. 🐔
Human: This is the secondary consumer. I eat the chicken. 🧑🍳
💡 I could also be a primary consumer if I eat corn directly (like corn on the cob!).
✅ Humans are part of many different food chains, acting as primary, secondary, or even tertiary consumers depending on what we eat.
6
Solved Example
Hard Level
Consider the following simple food web:
Grass is eaten by Rabbits and Grasshoppers.
Grasshoppers are eaten by Frogs.
Rabbits are eaten by Foxes.
Frogs are eaten by Snakes.
Snakes are eaten by Foxes.
Which organism in this food web is a tertiary consumer (an animal that eats a secondary consumer)?
Solution & Explanation
Let's trace the food chains to find a tertiary consumer:
Food Chain 3 (continuing from Snake):
Grass (Producer) 👉 Grasshopper (Primary Consumer) 👉 Frog (Secondary Consumer) 👉 Snake (Tertiary Consumer) 👉 Fox (Quaternary Consumer - eats a tertiary consumer!)
Based on this analysis:
The Snake eats the Frog (a secondary consumer), making the Snake a tertiary consumer. 🐍
💡 The Fox also eats the Snake, which means the Fox can be a quaternary consumer in this specific chain. The Fox also eats the Rabbit (a primary consumer), making it a secondary consumer in that chain. An organism can have different roles in different food chains within a food web!
✅ The tertiary consumer in this food web is the Snake.
7
Solved Example
Medium Level
In a pond ecosystem, a food web includes: Algae, Tadpoles, Dragonflies, Small Fish, Frogs, Birds.
Algae are producers.
Tadpoles eat Algae.
Dragonflies eat Tadpoles.
Small Fish eat Algae.
Frogs eat Dragonflies and Small Fish.
Birds eat Frogs and Small Fish.
What would be the likely immediate impact on the Tadpole and Bird populations if the Frog population suddenly disappeared?
Solution & Explanation
Let's analyze the connections:
Impact on Tadpole Population:
Frogs eat Dragonflies. Dragonflies eat Tadpoles. If frogs disappear, there would be fewer predators for Dragonflies. This would likely lead to an increase in the Dragonfly population. With more Dragonflies, more Tadpoles would be eaten, causing the Tadpole population to decrease. 📉
Impact on Bird Population:
Birds eat Frogs. If the Frog population disappears, the birds would lose one of their food sources. This would likely cause the Bird population to decrease, or they would have to find alternative food sources (like more Small Fish). 🕊️
✅ The removal of one species can have complex and far-reaching effects on an entire ecosystem.
8
Solved Example
Real World Example
You're observing a garden with healthy soil. You notice many earthworms and mushrooms. Explain the important role these organisms play in the garden's food web, even though they aren't typically "eaten" by other animals in the same way plants are eaten by herbivores.
Solution & Explanation
Earthworms and mushrooms are vital components of the garden's food web as decomposers! 🍂
Earthworms: They burrow through the soil, eating dead leaves, plant matter, and other organic debris. As they digest this material, they break it down into simpler nutrients. Their waste (castings) enriches the soil, making it more fertile for plants to grow. They also aerate the soil, which helps roots breathe. 🐛
Mushrooms (Fungi): Fungi are primary decomposers. They break down dead plants and animals that other organisms cannot digest. They release enzymes that decompose complex organic molecules into simpler inorganic nutrients (like nitrogen, phosphorus, and potassium). These nutrients are then absorbed by plant roots. 🍄
✅ Without decomposers like earthworms and mushrooms, dead organic matter would pile up, and essential nutrients would not be recycled back into the soil for producers (like garden plants) to use. They complete the cycle of life in an ecosystem!
6th Grade Other: Food Chain And Food Web Practice Questions
Example 1:
💡 Look at the simple food chain below:
Grass 👉 Rabbit 👉 Fox
Identify the role of each organism in this food chain: producer, primary consumer, or secondary consumer.
Solution:
Here's how to identify the role of each organism:
Grass: The grass is the producer. Producers make their own food, usually through photosynthesis, and form the base of the food chain. 🌿
Rabbit: The rabbit is the primary consumer. Primary consumers are herbivores that eat producers. Rabbits eat grass. 🥕
Fox: The fox is the secondary consumer. Secondary consumers are carnivores or omnivores that eat primary consumers. Foxes eat rabbits. 🦊
✅ Key Takeaway: Energy flows from producers to consumers!
Example 2:
📌 Match the following terms with their correct definitions:
Producer
Consumer
Decomposer
Definitions:
A) An organism that gets energy by eating other organisms.
B) An organism that breaks down dead organic matter, returning nutrients to the soil.
C) An organism that makes its own food, usually using energy from the sun.
Solution:
Let's match each term to its definition:
1. Producer: Matches with C) An organism that makes its own food, usually using energy from the sun. Think of plants! 🌱
2. Consumer: Matches with A) An organism that gets energy by eating other organisms. Animals are consumers! 🦁
3. Decomposer: Matches with B) An organism that breaks down dead organic matter, returning nutrients to the soil. Fungi and bacteria are great examples! 🍄
✅ Understanding these roles is fundamental to understanding ecosystems.
Example 3:
💡 Consider the following organisms: Sun, Algae, Small Fish, Heron.
Draw a food chain using these organisms and show the direction of energy flow with arrows.
Solution:
Here's the food chain showing the flow of energy:
Sun energy ➡️ Algae ➡️ Small Fish ➡️ Heron
The Sun provides the initial energy. ☀️
Algae (a producer) uses sunlight to make its food. 🌿
Small Fish (a primary consumer) eats the algae. 🐟
Heron (a secondary consumer) eats the small fish. 🦅
✅ Remember: The arrows always point in the direction the energy is moving, from the organism being eaten to the organism that eats it.
Example 4:
Imagine a food chain in a forest: Trees 👉 Deer 👉 Wolves.
What would likely happen to the population of deer and trees if the population of wolves suddenly decreased significantly (e.g., due to disease)?
Solution:
Let's break down the impact on each population:
Impact on Deer Population:
If the number of wolves (the predators of deer) decreases, fewer deer will be hunted and eaten. This would likely lead to an increase in the deer population. 📈
Impact on Tree Population:
With an increased deer population, there would be more deer eating the trees (their food source). This increased grazing would likely lead to a decrease in the tree population, especially young saplings. 📉
✅ This shows how all parts of a food chain are interconnected. A change in one population can have a ripple effect throughout the ecosystem.
Example 5:
Think about your own diet. Describe a food chain that includes you as a consumer, starting with a producer.
Solution:
Here's an example of a food chain involving me as a consumer:
Corn Plant 👉 Chicken 👉 Human (eating chicken nuggets!)
Corn Plant: This is the producer. It makes its own food using sunlight. 🌽
Chicken: This is the primary consumer. It eats the corn. 🐔
Human: This is the secondary consumer. I eat the chicken. 🧑🍳
💡 I could also be a primary consumer if I eat corn directly (like corn on the cob!).
✅ Humans are part of many different food chains, acting as primary, secondary, or even tertiary consumers depending on what we eat.
Example 6:
Consider the following simple food web:
Grass is eaten by Rabbits and Grasshoppers.
Grasshoppers are eaten by Frogs.
Rabbits are eaten by Foxes.
Frogs are eaten by Snakes.
Snakes are eaten by Foxes.
Which organism in this food web is a tertiary consumer (an animal that eats a secondary consumer)?
Solution:
Let's trace the food chains to find a tertiary consumer:
Food Chain 3 (continuing from Snake):
Grass (Producer) 👉 Grasshopper (Primary Consumer) 👉 Frog (Secondary Consumer) 👉 Snake (Tertiary Consumer) 👉 Fox (Quaternary Consumer - eats a tertiary consumer!)
Based on this analysis:
The Snake eats the Frog (a secondary consumer), making the Snake a tertiary consumer. 🐍
💡 The Fox also eats the Snake, which means the Fox can be a quaternary consumer in this specific chain. The Fox also eats the Rabbit (a primary consumer), making it a secondary consumer in that chain. An organism can have different roles in different food chains within a food web!
✅ The tertiary consumer in this food web is the Snake.
Example 7:
In a pond ecosystem, a food web includes: Algae, Tadpoles, Dragonflies, Small Fish, Frogs, Birds.
Algae are producers.
Tadpoles eat Algae.
Dragonflies eat Tadpoles.
Small Fish eat Algae.
Frogs eat Dragonflies and Small Fish.
Birds eat Frogs and Small Fish.
What would be the likely immediate impact on the Tadpole and Bird populations if the Frog population suddenly disappeared?
Solution:
Let's analyze the connections:
Impact on Tadpole Population:
Frogs eat Dragonflies. Dragonflies eat Tadpoles. If frogs disappear, there would be fewer predators for Dragonflies. This would likely lead to an increase in the Dragonfly population. With more Dragonflies, more Tadpoles would be eaten, causing the Tadpole population to decrease. 📉
Impact on Bird Population:
Birds eat Frogs. If the Frog population disappears, the birds would lose one of their food sources. This would likely cause the Bird population to decrease, or they would have to find alternative food sources (like more Small Fish). 🕊️
✅ The removal of one species can have complex and far-reaching effects on an entire ecosystem.
Example 8:
You're observing a garden with healthy soil. You notice many earthworms and mushrooms. Explain the important role these organisms play in the garden's food web, even though they aren't typically "eaten" by other animals in the same way plants are eaten by herbivores.
Solution:
Earthworms and mushrooms are vital components of the garden's food web as decomposers! 🍂
Earthworms: They burrow through the soil, eating dead leaves, plant matter, and other organic debris. As they digest this material, they break it down into simpler nutrients. Their waste (castings) enriches the soil, making it more fertile for plants to grow. They also aerate the soil, which helps roots breathe. 🐛
Mushrooms (Fungi): Fungi are primary decomposers. They break down dead plants and animals that other organisms cannot digest. They release enzymes that decompose complex organic molecules into simpler inorganic nutrients (like nitrogen, phosphorus, and potassium). These nutrients are then absorbed by plant roots. 🍄
✅ Without decomposers like earthworms and mushrooms, dead organic matter would pile up, and essential nutrients would not be recycled back into the soil for producers (like garden plants) to use. They complete the cycle of life in an ecosystem!