Question 2
Which of the four methods of seed dispersal uses no outside agent at all?
The right answer is the one marked above.
An explosive mechanism. The pericarp bursts and throws the seeds itself. It is the one method the plant pays for entirely, when it builds the fruit.
Animals, wind and water are the same three agents that carried the pollen earlier in the chapter, now carrying the seed. Only the fourth method is the plant's own.