A Viola plant bears 12 flowers that open and 18 flowers that stay closed…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A Viola plant bears flowers that open and flowers that stay closed. A heavy storm keeps all pollinators away for the whole season. The closed flowers set seed on their own, and the open flowers set none.
- How many flowers set seed?
- What per cent of all the flowers set seed?
Need a reminder? The key ideaShow
Autogamy is pollination within one flower. Geitonogamy is pollination between flowers of the same plant. Xenogamy is pollination between flowers of different plants. Cleistogamous flowers never open and always self-pollinate. Wind-pollinated flowers have light pollen, a feathery stigma and one ovule in each ovary. Animal-pollinated flowers are colourful and make nectar.
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. open flowers, closed flowers, no pollinators.
Plan. Closed flowers are cleistogamous, so they set seed without pollinators.
Step 1. The seed. The closed flowers set seed.
Step 2. The share. The total is flowers. .
Answer: flowers; .
Check. of is .
Watch out. The open flowers need a pollinator, so they set no seed in the storm.
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