A periderm has 12 rows of cork, 1 row of cork cambium and 3 rows of phelloderm…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A periderm has rows of cork, row of cork cambium and rows of phelloderm. Each row of cells is mm thick.
- How many rows does the periderm have in all?
- How thick is the periderm?
- What per cent of the rows is dead cork?
Need a reminder? The key ideaShow
The cork cambium (phellogen) arises in the cortex and cuts off cells on both sides. Outward it makes the cork (phellem), whose dead cells have suberin in their walls and form a waterproof cover. Inward it makes the phelloderm (secondary cortex), made of living cells. The three make the periderm. A lenticel is a patch of loosely arranged cells in the cork, and it lets gases pass. Bark means all the tissues outside the vascular cambium.
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. Rows. rows.
Step 2. Thickness. mm.
Step 3. Dead share. .
Answer: rows; mm; .
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