Grade 6 Science & Technology · Strand 1: Living things and the Environment · Fungi
Microscopic Fungi Yeast
A short Grade 6 Science & Technology lesson for the CBE curriculum, part of Living things and the Environment: Fungi. Learn it on any phone with notes and slides, then check yourself with a quick quiz and earn XP. This lesson is free.
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5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.
1. Why is yeast described as a unicellular fungus?
- A. It is made up of only one living cell
- B. It forms long threads of many cells
- C. It grows large stalks and caps like mushrooms
- D. It makes its own food using chlorophyll
2. In the balloon experiment, a flask contains warm water, sugar and yeast, and a balloon is stretched over its neck. Why does the balloon inflate?
- A. Yeast releases carbon dioxide gas as it breaks down sugar
- B. Yeast releases oxygen gas as it makes food
- C. Warm water changes into air inside the flask
- D. Ordinary room air is pushed into the balloon
3. Why does mandazi dough containing yeast become soft and spongy?
- A. Carbon dioxide bubbles from yeast are trapped in the dough
- B. Yeast cells join together to form hard threads
- C. Sugar changes into flour
- D. Oxygen from photosynthesis fills the dough
4. Which water is best for waking up dry yeast in the flask experiment?
- A. Warm water at about 35–40 °C
- B. Ice-cold water
- C. Boiling water
- D. No water at all
5. What name is given to the breakdown of sugar by yeast without oxygen, which releases carbon dioxide gas?
Type your answer in the lesson.
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