- Green plants are a kind of producer
- A producer is a source of sugar in an ecosystem
- Therefore, plants are a source of sugar in an ecosystem

- Plants are a source of sugar in an ecosystem
- A source of something produces that something
- So, plants produce sugar in an ecosystem

- Photosynthesis makes food for the plant by converting carbon dioxide, water, and sunlight into carbohydrates
- Sugar is a kind of food
- Therefore, photosynthesis makes sugar for plants

- Plants produce sugar in an ecosystem
- Photosynthesis makes sugar for plants
- So, plants produce sugar during photosynthesis

Hence, plants produce sugar during photosynthesis
[Question]In addition to oxygen, what do plants produce during photosynthesis?
[Context]- Green plants are a kind of producer 
- Photosynthesis makes food for the plant by converting carbon dioxide, water, and sunlight into carbohydrates 
- A producer is a source of sugar in an ecosystem 
- Sugar is a kind of food 
- A source of something produces that something