Given a scientific passage and an answer, generate a question for the given answer.

Q: Passage: Centrioles are rod-like structures made of short microtubules. Nine groups of three microtubules make up each centriole. Two perpendicular centrioles make up the centrosome . Centrioles are very important in cellular division, where they arrange the mitotic spindles that pull the chromosome apart during mitosis. Answer: centrioles

A: What are the rod-like structures made of short microtubules that play an important part in cellular division?
****
Q: Passage: Modern reptiles live in many different habitats. They can be found on every continent except Antarctica. Answer: reptiles

A: Modern members of what broad animal group live in many different habitats and are found on every continent except antarctica?
****
Q: Passage: Plants in the haploid generation are called gametophytes . They form from haploid spores. They have male and/or female reproductive organs and reproduce sexually. They produce haploid gametes by mitosis. Fertilization of gametes produces diploid zygotes. Zygotes develop into the diploid generation. Answer: through mitosis

A:
How do gametophyte plants form haploid gametes?
****