Answer:
The correct answer is the option: haploid, and are made when haploid spores undergo mitosis.
Step-by-step explanation:
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The pollen grains in angiosperms are the male sex cells. Therefore they are haploid, since they have a part of the genetic material. They are formed in mitosis.
After analysis, we conclude that the correct answer is the option: haploid, and are made when haploid spores undergo mitosis.