EasyBiologyHigh School (9–10)GeneralLife Processes › NutritionPlant Biology › PhotosynthesisNumerical
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.
Discussion (0)
Log in to join the discussion.
Loading…