A hypothesis is a proposition that has not been yet corroborated and from which an investigation can be developed. That is, is an affirmation that can be or not be true, however, it is formulated based on an indication and/or series of facts to which certain assumptions can be added.
In the description provided, there are three different possible hypotheses:
-the space exposed seeds will germinate less number of seeds than the normal tomato seeds.
-the space exposed seeds will germinate more seeds than the normal tomato seeds.
-the space exposed seeds will germinate the same number of seeds as the normal tomato seeds.
One investigation allows more than one hypothesis, and most of the time, one is corroborated, proving the other ones wrong.