NAME________________________ DATE_____ HOUR_____

FILAMENTOUS GREEN ALGAE ACTIVITY

ALGAE/MOSS/FERNS - 2

PURPOSE: To observe one type of green algae.

MATERIALS NEEDED: Prepared slides of spirogyra, and a microscope.

PROCEDURE: MAKE YOUR SKETCHES ON THIS SHEET IN THE SPACES PROVIDED!

    1. Obtain two slides. One of Spirogyra vegetative, and one of Spirogyra conjugation.
    2. Examine the vegatative slide under low power. Sketch one strand of the Spirogyra.
    3. Move to high power. Now sketch one cell of the Spirogyra. Be sure to notice the arrangement of the chloroplasts.
    4. Examine the conjugation slide under low power. Find two parallel strands that are attached to each other.
    5. Sketch the two strands that are attached under low power.
    6. Switch to high power. Focus on one of the cells of the two that are attached. Sketch that cell.
    7. Return your slides. Turn off your scope.

 

ONE STRAND OF SPIROGYRA UNDER LOW POWER

ONE CELL OF SPIROGYRAL UNDER HIGH POWER

TWO PARALLEL CELLS AND THEIR CONJUGATION TUBE UNDER LOW POWER

ONE CELL IN CONJUGATION UNDER HIGH POWER

 

CONCLUSIONS:

  1. Are there different kinds of Spirogyra cells?

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  2. What is the shape of Spirogyra?

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  3. What happens during Spirogyra conjugation?

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  4. What is the shape of the Spirogyra chloroplast?

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  5. What is the function of the conjugation tubes?

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  6. Would Spirogyra survive on land? Explain your answer.

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  7. In what ways is Spirogyra like a protist? In what ways is it like a plant?

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  8. A student did a test on Spirogyra and found Beta Carotene. Beta Carotene is an orange photosynthetic pigment. What does it do for Spirogyra? Why doesn’t it make Spirogyra look orange?