The ovary of a flower has 14 ovules. Pollination is poor, and only 9 of the ovules are fertilised…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The ovary of a flower has ovules. Pollination is poor, and only of the ovules are fertilised. Each fertilised ovule becomes one seed.
- How many seeds does the fruit have?
- How many male gametes were used?
- How many ovules did not form seeds?
Need a reminder? The key ideaShow
The zygote becomes the embryo, the PEN becomes the endosperm, the integuments become the seed coat, and the ovule becomes the seed. The embryo, the seed coat and the perisperm are diploid, and the endosperm is triploid. A mature seed has about to water. The dry matter does not change when the seed loses water.
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. ovules, fertilised.
Plan. Count the seeds first, then the gametes.
Step 1. The seeds. .
Step 2. The male gametes. .
Step 3. The ovules without seeds. .
Answer: seeds; male gametes; ovules.
Check. ovules.
Watch out. An ovule that is not fertilised does not become a seed.
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