A vertical section of a leaf shows these layers: an upper epidermis of 12 micrometres, palisade…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A vertical section of a leaf shows these layers: an upper epidermis of micrometres, palisade parenchyma of micrometres, spongy parenchyma of micrometres and a lower epidermis of micrometres. (a) How thick is the leaf? (b) How thick is the mesophyll? (c) What percentage of the thickness is mesophyll?
Need a reminder? The key ideaShow
Dicot leaf (dorsiventral): adaxial and abaxial epidermis with cuticle, more stomata on the abaxial face; mesophyll of palisade parenchyma (upper, long cells, many chloroplasts) and spongy parenchyma (lower, loose, air cavities); reticulate venation; xylem towards the upper side and phloem towards the lower side of a bundle with a bundle sheath. Monocot leaf (isobilateral): stomata on both faces, mesophyll not differentiated, parallel venation, bundles nearly equal; bulliform cells on the upper epidermis help the leaf to curl in dry weather.
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. The leaf. micrometres.
Step 2. The mesophyll. micrometres.
Step 3. The share. percent.
Answer: (a) micrometres; (b) micrometres; (c) percent.
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