question_answer 20)

                Embryo sac is to ovule as ......... is to an anther. (a) stamen          (b) filament                        (c) pollen grain                  (d) androecium

Answer:

                  (c) The pollen grains represent the male gametophytes. As the anthers mature and dehydrate, the microspores dissociate from each other and develop into pollen grains .So, embryo sac is to ovule as pollengrain is to an anther.