1. what is the adaptive advantage of having the system to propel sporangia as se

Question

1. what is the adaptive advantage of having the system to propel sporangia as seen in pilobolus?

2.how many bacterial cells are necessary to start a colony?

3.how many bacteria will be produced from single bacterium in a day?

4. in blue green algae (gloeocapsa), what hols the colony together?

5.in what ways do blue green algae resemble bacteria? what are significant differences?

6. what criterion can you use to decide if an organism form true colonies?

7. does the fact that sexual recombiantion has not been found in the cyanophyta mean that these organism lack sex?

Explanation / Answer

1. As seen in Pilobolus, the sporangiophore builds up pressure to throw or propel the sporangium some distance away. This is done to ensure that this new sporangium might attach to new vegetation and be eaten by some host. It would then be excreted and start its life cycle all over again.
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2. A single bacterial cell is enough to start a colony.
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3. From a single bacterium, the number of bacteria produced in a day would depend on the time taken for the bacteria to divide.
If a bacterium takes 1 hour to divide, then at the end of 24 hours, you will have to use the formula:
2n
2 is the number of cells from a single division. n is the total number of divisions[here 24]
So the answer would be 16,777,216.

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4.In blue-green algae, each cell secretes individual gelatinous sheaths around itself. This sticky sheath holds the colony together.

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5. Both blue-green bacteria and bacteria do not possess mitochondria, vacuoles and endoplasmic reticulum.

The blue green algae have a cell envelope which is similar to the cell wall of bacteria.

A mucopeptide component is present in the cell wall of both.

both do not possess a nuclear membrane

Both possess mesosomes

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Significant differences are:

blue green algae can conduct photosynthesis while bacteria cannot.

Algae contain chlorophyll but bacteria dont.

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6.True colonies consist of the same species growing together.

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7. Cyanophyta may not possess sexual recombination but that does not mean that these organisms lack sex. Sex is a composite term which may mean any of the following:

fusion

recombination

Fission

Union of male and female gametes.

The last category is usually considered as sex which is a wrong notion.

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