In Pinus, the four-celled pollen grain consists of one prothallial cell, two generative cells, and one tube cell.
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Q40: The tallest living plant is:
A)Sequoiadendron giganteum.
B)Sequoiadendron semperiverens.
C)Metasequoia.
D)Taxodium.
E)Pinus
Q41: All seed plants are heterosporous.
Q42: The Bennettitales is an extinct group of
Q43: A seed develops into an ovule.
Q44: Members of the phylum _ harbor a
Q46: Each gymnosperm ovule usually produces several archegonia.
Q47: The tallest vascular plant belongs to the
Q48: Seeds are thought to have evolved before
Q49: In gymnosperms, the ovules abort about 95
Q50: The bifacial vascular cambium evolved first in
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