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

SOLUTION: Some gametophytes develop underground and form mycorrhizal associations with what?

PROBLEM: Muscle groups are controlled by the motor cortex .

SOLUTION: Muscle groups are controlled by what mechanism?

PROBLEM: Complete and incomplete are the two types of digestive systems invertebrates may have.

SOLUTION:
What are the two types of digestive systems invertebrates may have?