Educational worksheet illustrating the processes of photosynthesis and cellular respiration.

Problem Analysis:

The task involves comparing photosynthesis and cellular respiration. The goal is to fill in the blanks using the provided words and understand the processes involved.

#### Key Concepts:
1. Photosynthesis:
- Occurs in plants (and some other organisms like algae).
- Uses sunlight, water, and carbon dioxide to produce glucose (sugar) and oxygen.
- Chemical equation:
\[
6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2
\]

2. Cellular Respiration:
- Occurs in animals, plants, and most living organisms.
- Breaks down glucose in the presence of oxygen to release energy (ATP), carbon dioxide, and water.
- Chemical equation:
\[
C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy (ATP)}
\]

Solution:

#### Part 1: Drag and Drop
We need to match the substances with their respective processes (photosynthesis or respiration).

- Photosynthesis:
- Plants take in CO₂ (carbon dioxide) and water (H₂O) from the environment.
- They use sunlight to convert these into sugars (glucose) and release O₂ (oxygen) as a byproduct.

- Respiration:
- Animals (and other organisms) take in O₂ (oxygen) from the environment.
- They break down sugars (glucose) and release CO₂ (carbon dioxide) and water (H₂O) as byproducts.

Thus, the drag-and-drop should be:
- CO₂: Respiration (inward arrow for respiration)
- Water: Photosynthesis (inward arrow for photosynthesis)
- O₂: Photosynthesis (outward arrow for photosynthesis)
- Sugars: Respiration (outward arrow for respiration)

#### Part 2: Fill in the Blanks
The sentence provided is:
> Plants produce a gas called ________ and food in the form of ________ during photosynthesis while animals release a gas called ________ and ________ during cellular respiration.

Using the concepts of photosynthesis and cellular respiration:
1. Plants produce oxygen (O₂) as a gas during photosynthesis.
2. Plants produce sugar (glucose) as food during photosynthesis.
3. Animals release carbon dioxide (CO₂) as a gas during cellular respiration.
4. Animals also release water (H₂O) during cellular respiration.

So, the completed sentence is:
> Plants produce a gas called oxygen and food in the form of sugar during photosynthesis while animals release a gas called carbon dioxide and water during cellular respiration.

Final Answer:

\[
\boxed{\text{oxygen, sugar, carbon dioxide, water}}
\]