Cellular Respiration Practice worksheet - Free Printable

Let's solve the Cellular Respiration Worksheet step by step and explain each part clearly.

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Question 1: Complete the equation for cellular respiration

The balanced chemical equation for cellular respiration is:

> C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + Energy (ATP)

We are given a diagram with boxes to fill in both symbols and names, along with labels like "Reactants" and "Products".

#### Step-by-step filling:

Top row (symbols):
- First box: C₆H₁₂O₆ (glucose)
- Second box: O₂ (oxygen gas)
- Arrow points to:
- First product: CO₂ (carbon dioxide)
- Second product: H₂O (water)
- Third product: ATP (useable energy)

But note: The worksheet shows 6 in front of O₂, CO₂, and H₂O — so we must include those coefficients.

So the top row becomes:
```
[ C₆H₁₂O₆ ] + [ 6 ] [ O₂ ] → [ 6 ] [ CO₂ ] + [ 6 ] [ H₂O ] + [ ATP ]
```

Now, below each symbol, write the name of the chemical:

- C₆H₁₂O₆ → Glucose
- O₂ → Oxygen Gas
- CO₂ → Carbon Dioxide
- H₂O → Water
- ATP → Useable Energy

Then, label the reactants (on the left) and products (on the right):

- Reactants: Glucose and Oxygen Gas
- Products: Carbon Dioxide, Water, Useable Energy

Now let’s fill in the diagram accordingly.

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#### Final Answer for Question 1:

Top Row (Symbols):
- Box 1: C₆H₁₂O₆
- Box 2: O₂
- Product 1: CO₂
- Product 2: H₂O
- Product 3: ATP

Second Row (Names):
- Below C₆H₁₂O₆ → Glucose
- Below O₂ → Oxygen Gas
- Below CO₂ → Carbon Dioxide
- Below H₂O → Water
- Below ATP → Useable Energy

Labels:
- Arrows pointing down from glucose and oxygen → labeled Reactants
- Arrows pointing down from CO₂, H₂O, ATP → labeled Products

✔ So the completed diagram should show:
```
[ C₆H₁₂O₆ ] + [ 6 ] [ O₂ ] → [ 6 ] [ CO₂ ] + [ 6 ] [ H₂O ] + [ ATP ]
↓ ↓ ↓ ↓ ↓
Glucose Oxygen Gas Carbon Dioxide Water Useable Energy
↓ ↓ ↓ ↓ ↓
Reactants Products
```

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Question 2: Cellular Respiration and Photosynthesis Link

This question asks us to connect photosynthesis and cellular respiration.

Let’s break it down:

> In a plant, before it can do cellular respiration it must make food. To do this it needs ________ from the air, ________ from the soil, and ________. The food it produces is ________. With the ________ from photosynthesis, it can then go through cellular respiration. ________ (the food) and ________ from the air combine in cellular respiration. They form ________ (which is a gas), ________, and ________ (which provides energy). The purpose of cellular respiration is to make ________ and ________ are waste products that are let go in the process.

Let’s fill in the blanks using knowledge of photosynthesis and cellular respiration.

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#### Step-by-step explanation:

1. Photosynthesis inputs:
- Plants need carbon dioxide (CO₂) from the air
- Water (H₂O) from the soil
- And sunlight (energy source)

2. Food produced: Glucose (C₆H₁₂O₆)

3. Cellular respiration uses:
- Glucose (from photosynthesis)
- Oxygen (O₂) from the air

4. Products of cellular respiration:
- Carbon dioxide (gas)
- Water (liquid)
- ATP (useable energy)

5. Purpose of cellular respiration:
- To produce ATP (energy)
- Waste products: CO₂ and H₂O

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#### Now fill in the blanks:

> In a plant, before it can do cellular respiration it must make food. To do this it needs carbon dioxide from the air, water from the soil, and sunlight. The food it produces is glucose. With the glucose from photosynthesis, it can then go through cellular respiration. Glucose (the food) and oxygen from the air combine in cellular respiration. They form carbon dioxide (which is a gas), water, and ATP (which provides energy). The purpose of cellular respiration is to make ATP and carbon dioxide and water are waste products that are let go in the process.

✔ Final answer:

> In a plant, before it can do cellular respiration it must make food. To do this it needs carbon dioxide from the air, water from the soil, and sunlight. The food it produces is glucose. With the glucose from photosynthesis, it can then go through cellular respiration. Glucose (the food) and oxygen from the air combine in cellular respiration. They form carbon dioxide (which is a gas), water, and ATP (which provides energy). The purpose of cellular respiration is to make ATP and carbon dioxide and water are waste products that are let go in the process.

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Question 3: Fill in the blanks with correct word by dragging and dropping

This part seems incomplete in your image, but likely refers to matching terms like:
- Glucose
- Oxygen
- Carbon Dioxide
- Water
- ATP
- etc.

Since no specific blanks are shown here, we assume it’s just reinforcing the vocabulary used in questions 1 and 2.

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✔ Summary of Answers:

#### Question 1: Equation

| Symbol | Name |
|--------|------|
| C₆H₁₂O₆ | Glucose |
| O₂ | Oxygen Gas |
| CO₂ | Carbon Dioxide |
| H₂O | Water |
| ATP | Useable Energy |

Equation:
> C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP

Reactants: Glucose, Oxygen Gas
Products: Carbon Dioxide, Water, Useable Energy

#### Question 2: Fill-in-the-blank

> In a plant, before it can do cellular respiration it must make food. To do this it needs carbon dioxide from the air, water from the soil, and sunlight. The food it produces is glucose. With the glucose from photosynthesis, it can then go through cellular respiration. Glucose (the food) and oxygen from the air combine in cellular respiration. They form carbon dioxide (which is a gas), water, and ATP (which provides energy). The purpose of cellular respiration is to make ATP and carbon dioxide and water are waste products that are let go in the process.

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🔁 Connection Between Photosynthesis and Cellular Respiration

- Photosynthesis:
CO₂ + H₂O + Sunlight → Glucose + O₂
(Plants make their own food)

- Cellular Respiration:
Glucose + O₂ → CO₂ + H₂O + ATP
(All living things use food to make energy)

They are opposites in terms of inputs and outputs, but interconnected — plants use photosynthesis to create food, then use that food in respiration to generate energy.

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