Ecosystem worksheet for Grade-4 - Free Printable

Activity 1: Choose the correct option

#### Question 1: Which of the following is a biotic component of an ecosystem?
- Options:
- (a) soil
- (b) water
- (c) bacteria
- (d) air

Explanation:
Biotic components are living organisms in an ecosystem. These include plants, animals, fungi, and microorganisms like bacteria. Soil, water, and air are abiotic (non-living) components.

Correct Answer:
(c) bacteria

---

#### Question 2: Squirrel, bear, and human are examples of _______.
- Options:
- (a) herbivores
- (b) carnivores
- (c) omnivores
- (d) decomposers

Explanation:
- Herbivores eat only plants.
- Carnivores eat only other animals.
- Omnivores eat both plants and animals.
- Decomposers break down dead organic matter.

Squirrels primarily eat nuts and seeds (plants), bears eat a variety of foods including plants and animals, and humans also consume both plants and animals. Therefore, they are all examples of omnivores.

Correct Answer:
(c) omnivores

---

#### Question 3: Which of the following statements is correct for producers?
- Options:
- (a) meat eaters
- (b) prepare their own food
- (c) plant eaters
- (d) plant and meat eaters

Explanation:
Producers are organisms that can produce their own food through photosynthesis (e.g., plants). They do not eat other organisms but create their own food using sunlight, water, and carbon dioxide.

Correct Answer:
(b) prepare their own food

---

#### Question 4: Living things which obtain their food from other living things are termed as _______.
- Options:
- (a) consumers
- (b) producers
- (c) decomposers
- (d) prey

Explanation:
- Consumers are organisms that obtain their food by eating other organisms.
- Producers make their own food through photosynthesis.
- Decomposers break down dead organic matter.
- Prey refers to organisms that are hunted by predators.

Living things that obtain their food from other living things are called consumers.

Correct Answer:
(a) consumers

---

Activity 2: Select the correct answer for each animal according to their feeding habits.

#### Image 1: Sheep
- Options: Herbivore / Carnivore

Explanation:
Sheep are herbivores because they primarily eat grass and other plant materials.

Correct Answer:
Herbivore

---

#### Image 2: Bear
- Options: Omnivore / Herbivore

Explanation:
Bears are omnivores because they eat both plants (fruits, berries) and animals (fish, insects).

Correct Answer:
Omnivore

---

#### Image 3: Spider
- Options: Omnivore / Carnivore

Explanation:
Spiders are carnivores because they hunt and eat other animals (insects).

Correct Answer:
Carnivore

---

#### Image 4: Monkey
- Options: Herbivore / Omnivore

Explanation:
Monkeys are omnivores because they eat both plants (fruits, leaves) and animals (insects, small creatures).

Correct Answer:
Omnivore

---

#### Image 5: Cheetah
- Options: Carnivore / Omnivore

Explanation:
Cheetahs are carnivores because they hunt and eat other animals (primarily gazelles and antelopes).

Correct Answer:
Carnivore

---

#### Image 6: Caterpillar
- Options: Carnivore / Herbivore

Explanation:
Caterpillars are herbivores because they primarily eat leaves and plant material.

Correct Answer:
Herbivore

---

Final Answers:

#### Activity 1:
1. (c) bacteria
2. (c) omnivores
3. (b) prepare their own food
4. (a) consumers

#### Activity 2:
1. Sheep: Herbivore
2. Bear: Omnivore
3. Spider: Carnivore
4. Monkey: Omnivore
5. Cheetah: Carnivore
6. Caterpillar: Herbivore

---

Boxed Final Answer:

\boxed{
\begin{aligned}
&\text{Activity 1:} \\
&1. \text{(c) bacteria} \\
&2. \text{(c) omnivores} \\
&3. \text{(b) prepare their own food} \\
&4. \text{(a) consumers} \\
\\
&\text{Activity 2:} \\
&1. \text{Sheep: Herbivore} \\
&2. \text{Bear: Omnivore} \\
&3. \text{Spider: Carnivore} \\
&4. \text{Monkey: Omnivore} \\
&5. \text{Cheetah: Carnivore} \\
&6. \text{Caterpillar: Herbivore} \\
\end{aligned}
}