instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Some gametophytes develop underground and form mycorrhizal associations with fungi.
answer:
Some gametophytes develop underground and form mycorrhizal associations with what?


question:
Oxygen is transferred through capillaries.
answer:
Which blood vessels is oxygen transferred through?


question:
One large eggs are generated during oogenesis.
answer:
How many large eggs are generated during oogenesis?