Bio Lab Wksht & HW Questions 69

Bio Lab Wksht & HW Questions 69 - Female cones are...

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64 Microspores then develop into pollen grains , the male gametophyte of conifers. Examine the demonstration of slides of pollen grains from pine. The pollen grain consists of a vegetative cell (also referred to as a tube cell ), which is responsible for growth of the pollen tube, a generative cell , which will divide to produce two sperm cells, and two sterile prothallial cells , which represent the remains of the vegetative body of the male gametophyte. Note the presence of two bladder-like wings. What is their function? Draw a pollen grain and label all structures described above. Observe the slide of the young ovulate (female) cone. Sketch it to the right.
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Unformatted text preview: Female cones are more complex than male cones. Megasporangia are borne on the upper surface of a flat structure called the scale , which in turn sits above another structure termed a bract . They are difficult to recognize as sporangia because some changes have occurred. They are now referred to as ovules . Continue with your examination of the female cone by looking at preserved specimens. Remove the bract/scale complex and look for ovules on top of the scale. Examine various dried cones on display and try to find the scale and bract. Make a diagram and label the bract, scale and ovule. How many ovules are present on each scale?...
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This note was uploaded on 12/27/2011 for the course BSC 1020 taught by Professor Danmoon during the Fall '11 term at UNF.

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