The fossil record indicates that the integument evolved through a gradual:
A) thickening of the megasporangium wall.
B) splitting of the megaspore wall.
C) fusion of megaspore lobes.
D) splitting of the ovule wall.
E) fusion of integumentary lobes.
Correct Answer:
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Q6: _ produce nonmotile sperm.
A)Conifers and gnetophytes
B)Conifers and
Q7: After fertilization, the integuments develop into the:
A)seed
Q8: In which gymnosperms do multiflagellated sperm swim
Q9: A micropyle is a(n):
A)nutritive structure of the
Q10: In which of the following groups is
Q12: Polyembryony is common in gymnosperms because a(n):
A)seed
Q13: Just before fertilization, a gymnosperm ovule contains:
A)an
Q14: In seed plants, the _ is called
Q15: In gymnosperms, pollination occurs usually by:
A)insects.
B)water.
C)wind.
D)birds.
E)mammals.
Q16: The progymnosperms had characteristics intermediate between those
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