So according to the hypothesis, in the judgment, God killed off something like 99.9% of the animals he made. And it is only the ones who made it into the ark that survived. The same goes for plant life too. Presumably all of the land vegetation that survives today was saved by Noah in the ark? Would you say this is accurate?
Why don’t you break down and read the Bible?
Then you could really know for yourself.
I don’t know that any percentages are known or given and there would be no need to take plants aboard the Ark if they could regenerate but other than the fresh olive leaf brought back by the dove I think the bible is silent on the matter of plants and the Ark.