Cambridge Secondary (7-9). Stage 9. Science. Learner's Book - Unit 1: Photosynthesis and the carbon cycle - Question 28

Which surface of a leaf has most stomata? Work with a partner for this activity. Put some warm (not hot) water into a beaker or glass. Take a fresh leaf, and push it down under the water. Discuss these questions with your partner. What do you think the bubbles contain?