4 spelling mistakes is sloppy.
Tomato is a type of fruit, which invalidates your vegtables (sic) group.

And I do not like the new trend of making an answer, the same as 1 of the clues.
DNA here, and "Orange, a thing that is orange" in a recent puzzle.

• A tomato is not a vegetable. - and you miss-spelled "vegetables" so it gives and incorrect, when you put in the connection.
• As far as I know "sweet fruit" isn't a real term for a group of fruits, so writing "fruit" should have been enough (obviously that also resulted in an incorrect)
• I'm not really a fan of the words to connect just being random clues about the thing they connect - not to mention the fact that the connection is one of the words...

4 vaguely defined and oddly denoted groups. I'm gonna take a wild guess that the person who made this grid is in the early years of high school based on the level of science being deployed here. The group with light in it also has an alternative answer in that they are all things humans can sense/ respond to changes in. See previous comments for my complaints about use of DNA as connected to DNA, sweet fruits not being a term I have ever heard used before, spelling and thinking tomatoes are vegetables.