Incredibly , this tube grows down the length of the style to deliver the sperm to the egg within the ovule (derived from the female gametophyte ) deep in the ovary

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Incredibly , this tube grows down the length of the style to deliver the sperm to the egg within the ovule (derived from the female gametophyte ) deep in the ovary . One haploid sperm fuses with the haploid egg to produce a diploid zygote . Another haploid sperm fuses with two haploid polar nuclei , meiotic products that did not become eggs , to produce a triploid endosperm . The endosperm will provide energy for the developing zygote . Angiosperm fertilization is referred to as double fertilization , because two sperm are involved. PROCEDURE IV a ) Examine an angiosperm flower . First draw a sketch and label as many of the parts that have been described as possible b) If enough specimens are available, carefully dissect a flower. In your diagram, label any additional parts that are now visible c) Select an anther and carefully open it under a dissecting microscope. Use a slide with a drop of water to visualize the pollen grains inside . Draw another sketch of these structures d) Now cut an ovary in cross section under the microscope and try to find and label the internal structures that you see . e) Finally examine a fruit that has been supplied for you , by taking a cross section through the fruit . Draw and examine the ovary wall , the flesh of the ovary tissue and the seeds .