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

[Q]: Collision frequency is greater for homogeneous category of catalysts, which also tend to be more sensitive to temperature and more 'expensive'.
[A]: Collision frequency is greater for what category of catalysts, which also tend to be more sensitive to temperature and more 'expensive'?


[Q]: Transpiration is when plant roots absorb liquid water and release water vapor into the atmosphere.
[A]: What is it called when plant roots absorb liquid water and release water vapor into the atmosphere?


[Q]: Radioactivity is the release of particles and/or energy from the nucleus of an atom.
[A]:
What is the release of particles and/or energy from the nucleus of an atom described as?