Question

In the angiosperm life cycle, two sperm cells are discharged in each ovule. The reason that two sperm nuclei travel down the pollen tube is that

they both stimulate growth of the pollen tube

one fertilizes the egg, and the other combines with the two polar nuclei

one fertilizes the egg, and the other fertilizes the synergid

one is for fertilizing the egg, and one directs the pollen tube toward the micropyle

if one fails in fertilization, there is a backup nucleus

Which plants have a gametophyte that is nutitionally dependent on the sporophyte?

gymnosperms and angiosperms

bryophytes and angiosperms

monilophytes and gymnosperms

lycophytes and bryophytes

lycophytes and monilophytes

Answer 1