4. Which of the following plant structures most directly produces the pollen tube of angiosperms?
(A) male gametophyte
(B) female gametophyte
(C) male sporophyte
(D) female sporophyte
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統計: A(0), B(0), C(0), D(1), E(0) #3981408
統計: A(0), B(0), C(0), D(1), E(0) #3981408