Question 1
What would be the main problem for a plant if all its seeds simply dropped to the ground beneath it?
The right answer is the one marked above.
They would compete with the parent and with each other for essential factors. A seed that drops has landed in the worst possible place — in the shade of a large plant of its own kind, among its roots.
Seeds beneath the parent germinate perfectly well; the trouble comes afterwards, which is what “they would be unable to germinate at all” misses. Fertilisation already happened — it is how the seed exists at all — and seeds from one plant are varied precisely because they came from sexual reproduction.