A style is 24 mm long. A compatible pollen tube grows through it at 3 mm per hour…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A style is mm long. A compatible pollen tube grows through it at mm per hour. A rejected tube grows at the same rate but stops after it has crossed of the style.
- How long does a compatible tube take to cross the style?
- What length does the rejected tube reach?
- For how long does the rejected tube grow?
Need a reminder? The key ideaShow
Outbreeding devices are different timing, different positions, self-incompatibility and unisexual flowers. A pollen tube grows through the style, enters the ovule by the micropyle and enters a synergid. Each tube delivers two male gametes. Time is the distance divided by the rate.
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. Style mm, rate mm/h, rejected tube stops at .
Plan. Use the time as distance over rate for each tube.
Step 1. The compatible tube. h.
Step 2. The rejected tube, length. mm.
Step 3. The rejected tube, time. h.
Answer: h; mm; h.
Check. of h is h.
Watch out. This is a model. Real tubes grow at very different rates.
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