EasyBiologyHigh School (11–12)Diversity of Living Organisms › Characteristics of LifeNumericalBoard Exam
A pond has 3 cells of the single-celled alga Chlamydomonas…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A pond has cells of the single-celled alga Chlamydomonas. Each cell divides into two once every hours, and all the cells survive. How many cells are there after days? Is this growth or reproduction?
Need a reminder? The key ideaShow
Growth is an increase in mass and in the number of cells. A living thing grows from inside, by cell division; a non-living thing grows only by material added on its outside. Plants grow all their life, animals up to a certain age. In a one-celled organism, growth and reproduction are one event: after divisions, one cell gives .
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. Divisions. , and divisions.
Step 2. Cells. cells.
Step 3. Growth or reproduction? Each new cell is a new individual, so both: in a one-celled organism they are one event.
Answer: cells; it is growth and reproduction at once.
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