A flower has 10 stamens, and every anther is of the usual kind…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A flower has stamens, and every anther is of the usual kind. Each microsporangium has pollen mother cells, and every one of them completes meiosis.
- How many microsporangia are in the flower?
- How many pollen grains are made in one microsporangium?
- How many pollen grains are made in the whole flower?
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. stamens. PMCs in each microsporangium.
Plan. Count the sacs, then the grains in one sac, then multiply.
Step 1. The sacs. microsporangia.
Step 2. One sac. pollen grains.
Step 3. The flower. pollen grains.
Answer: sacs; grains in a sac; grains in the flower.
Check. There are PMCs, and .
Watch out. Each PMC makes four grains, not one.
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