Which of these is, at least partly, performed by cells that are no longer alive?
-stomatal opening and closing in angiosperms
-water transport in angiosperms
-pollination in gymnosperms
-structural support in gymnosperms
-transport of sugars in gymnosperms

Which is the result of double fertilization in angiosperms?
-The endosperm develops into a diploid nutrient tissue
-a triploid zygote is formed
-both a diploid embryo and triploid endosperm are formed
-two embryos develop in every seed
-the fertilized antipodals develop into the seed coat

Which most closely represents the male gametophyte of seed-bearing plants?
-ovule
-microspore mother cell
-pollen grain
-embryo sac
-fertilized egg

thanks!