Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Producers in an ecosystem generally get their energy from the sun.
Where do producers in an ecosystem generally get their energy from?

The sun delivers power to the chemical factory chloroplasts.
What delivers power to the chemical factory chloroplasts?

Microwaves kind of waves are used in radar guns.

What kind of waves are used in radar guns?