A filament of Spirogyra is 36 cells long…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A filament of Spirogyra is cells long. A storm breaks it into pieces of cells each. Each piece grows, and its cells divide once every day.
- How many pieces are there?
- How many cells are there in all after days?
- Which kind of reproduction is this?
Need a reminder? The key ideaShow
Algae are simple, thalloid, autotrophic, mostly aquatic plants. Vegetative reproduction is by fragmentation, asexual by zoospores, and sexual by isogamy (equal gametes), anisogamy (unequal gametes, both motile) or oogamy (a large non-motile egg and a small motile male gamete). A population that doubles every hours grows by in hours.
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.
Step 1. Pieces. pieces.
Step 2. Cells. The cells double three times: cells.
Step 3. The kind. A piece growing into a new filament is vegetative reproduction by fragmentation.
Answer: pieces; cells; fragmentation.
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