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The female gametophyte is a _______ structure called an embryo sac, while the male gametophyte is a _______ structure called a pollen grain. When pollen attaches to the stigma of a flower, one of the sperm cells fertilizes an egg cell, producing a _______ zygote. Another sperm cell fertilizes the polar nuclei, forming a ________ endosperm. The _____ will eventually develop into the sporophyte.

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The answers to the blank spaces in the question are as follows:

  1. Haploid
  2. Haploid
  3. Diploid
  4. Triploid
  5. Zygote

What is double fertilization?

Double fertilization is a specific feature of angiosperms involving two male gametes and one female gamete.

In double fertilization, both the female and male gametes are haploid structures i.e. contain one set of chromosome.

One of the haploid sperm cells fertilizes an haploid egg cell, producing a diploid (2n) zygote. However, the other sperm cell fertilizes the polar nuclei, forming a triploid endosperm.

The zygote will eventually develop into the sporophyte (vegetative plant).

Learn more about double fertilization at: https://brainly.com/question/305603

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