Concept:The diagram shows the reproductive parts of a flower, and part 1 is the top of the female reproductive structure.Explanation:Part 1 is the uppermost part of the carpel (pistil).Its function is to receive pollen grains during pollination.This structure is known as the stigma.The swollen base below it, labelled 2, is the ovary.Since the question asks specifically for part 1, the correct identification is the stigma.Answer:D. stigma
