3) Examine the following image of a mature pollen grain. Of how many cells is a pine pollen grain composed? Why does it have such prominent wings? 4) Examine the following image showing a longitudinal section through an ovulate cone. Locate the outer megasporophylls and the ovules at the base of each.
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These include two prothallial cells, a generative cell, and a tube cell. The prothallial cells are usually not functional, while the generative cell will eventually divide to form sperm cells, and the tube cell will develop into the pollen tube. Show more…
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Observe the image of Pinus pollen cone. Identify and label the following structures: microsporophyll, microsporangium, and pollen grain. Observe the image of Pinus ovulate cone. Identify and label the following structures: megasporophyll and ovule. Observe the image of fern gametophyte. Identify and label the following structures: antheridium and archegonium.
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Examine a slide showing mature pollen grains. What two nuclei are present in these grains? Make sure to look around for binucleate cells.
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1. Life Cycle 3. What do the following pictures (a and b) represent (hint: sexual reproductive structures in gymnosperms)? Record your answers to the following in the report. 2. Reproduction 4. Can you see the pollen grain from the pine? What does it resemble? (describe the shape) 5. What are the germinated structures (arrow) in Figure 4b called?
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