true(T), False(F) or Doesn't say(DS)

1)gregor mendel was the first person to study.
2) He didn't choose to study the pea plant at random.
3) All of the first generation of pea plants showed a particular trait.
4)one of his conclusions was that the genes changed when they were passed on.
5) mendel's paper, Experiments in Plant Hybridization was quite popular when first published.​