A thin section of the tapetum of a microsporangium shows a ring of 60 cells…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A thin section of the tapetum of a microsporangium shows a ring of cells. Of these, cells have two nuclei, and the rest have one nucleus.
- How many cells have one nucleus?
- How many nuclei are in the ring?
- What is the mean number of nuclei in a cell?
Need a reminder? The key ideaShow
A flower has four whorls: calyx, corolla, androecium and gynoecium. A stamen has a filament and an anther. A typical anther is bilobed, with two microsporangia in each lobe, so it has four. The wall of a microsporangium has four layers: epidermis, endothecium, middle layers and tapetum. The sporogenous tissue lies in the centre.
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.
Given. cells in the ring. of them have nuclei.
Plan. Find the other group, count the nuclei, then divide.
Step 1. One nucleus. cells.
Step 2. The nuclei. nuclei.
Step 3. The mean. nuclei in a cell.
Answer: cells; nuclei; nuclei in a cell.
Check. The mean lies between and , as it should.
Watch out. Counting nuclei forgets that of the cells have two.
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