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All of the following statements about endosperm in angiosperms are correct EXCEPT:
A. It has a triploid chromosome number.
B. It forms from a portion of the embryo sac that contains the polar nuclei.
C. It provides nutrients for the growing embryo.
D. It forms entirely from maternal tissue.
E. It originates from a cell that is fertilized by a sperm nucleus from a pollen grain.
D is the answer.
I only understand that D is the right answer because everything else is correct; however, I want to know why D is correct. I thought that the endosperm is formed entirely from the maternal tissue because the only thing that the sperm provides is two nuclei. Comparing this to sexual reproduction in humans; the female ova provides most of the cytoplasm and mitochondria for the developing embryo; so I thought the same applied here in plant.
Thanks in advance!
A. It has a triploid chromosome number.
B. It forms from a portion of the embryo sac that contains the polar nuclei.
C. It provides nutrients for the growing embryo.
D. It forms entirely from maternal tissue.
E. It originates from a cell that is fertilized by a sperm nucleus from a pollen grain.
D is the answer.
I only understand that D is the right answer because everything else is correct; however, I want to know why D is correct. I thought that the endosperm is formed entirely from the maternal tissue because the only thing that the sperm provides is two nuclei. Comparing this to sexual reproduction in humans; the female ova provides most of the cytoplasm and mitochondria for the developing embryo; so I thought the same applied here in plant.
Thanks in advance!