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Meera peels the lower skin of a leaf and looks at it under a microscope.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Meera peels the lower skin of a leaf and looks at it under a microscope. In a field of view of she counts stomata. On the upper skin, the same field holds stomata.
- How many stomata are there in each mm² of the lower surface, and of the upper surface?
- The lower surface of the leaf has an area of . About how many stomata does it carry?
Need a reminder? The key ideaShow
Photosynthesis: carbon dioxide and water, with sunlight and chlorophyll, give glucose and oxygen; the glucose is stored as starch. Carbon dioxide enters through stomata, most of them on the lower surface of the leaf. Iodine turns starch blue-black.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Lower surface. stomata in each mm².
Step 2. Upper surface. stomata in each mm².
Step 3. The whole lower surface. , so stomata.
Answer: and stomata in each mm²; about stomata on the lower surface. The lower surface has four times as many, which keeps water loss low in the hot sun on the upper surface.
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