Ravi studies a cell in a root meristem. It divides once in every 20 h…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Ravi studies a cell in a root meristem. It divides once in every h. Start with one cell. Every cell goes on dividing and none is lost.
- How many cycles are completed in days?
- How many cells are there after days?
- How many separate cell divisions took place in all?
Need a reminder? The key ideaShow
Cytokinesis cuts the cytoplasm in two. An animal cell forms a furrow from the outside, and a plant cell forms a cell plate from the centre. Each division doubles the number of cells. After divisions of every cell, one cell gives cells.
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. Cycle: h. Time: h. Start: cell.
Plan. Find the cycles, then double the cells that many times. Then count the divisions from the gain in cells.
Step 1. Cycles. .
Step 2. Cells. .
Step 3. Divisions. One division turns one cell into two, a gain of one cell. The cells grew from to , a gain of . So divisions took place.
Answer: cycles; cells; divisions.
Watch out. The answer is not divisions. The first cycle has division, the second has , the third , and so on: .
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