A) A sperm cell,enclosed in a pollen grain with another sperm,is produced in the pistil that explosively ejects it into the air where it is transported to a stigma from which it passes through a pollen tube that grows down the style to the ovary,enters the ovule and joins with the egg cell.
B) A sperm cell,enclosed in a pollen grain with another sperm,is produced in the anther,transported to a stigma where it passes through a pollen tube that grows down the style to the ovary,enters the ovule and joins with the egg cell.
C) A sperm cell,enclosed in a pollen grain with another sperm,is produced in the filament,transported to a stigma where it passes through a pollen tube that grows down the style to the ovary,enters the ovule and joins with the egg cell.
D) A sperm cell,enclosed in a pollen grain with another sperm,is produced in the anther,transported to the pedicel where it passes through a pollen tube that grows down the style to the ovary,enters the ovule and joins with the egg cell.
E) A sperm cell is produced in the anther,transported to a stigma where it becomes enclosed along with another sperm cell into a pollen grain that grows down the style to the ovary,enters the ovule and joins with the egg cell.
G) C) and D)
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A) a monocot
B) a eudicot
C) a hybrid
D) Amborella trichopoda
E) a gymnosperm
G) A) and B)
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A) A reduction in the ability of pollinators to detect and transfer pollen grains to a stigmA.
B) A reduction in the ability of spores to disperse to new areas.
C) A reduction in the ability of the integument of an ovule to develop into a seed coat.
D) A decrease in the number of sperm that can be produceD.
E) A decrease in the ability of the pollen grain or spore to open when a suitable location is found.
G) C) and D)
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B) False
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A) All the vegetation that had been produced prior to the historic low decayed,releasing carbon dioxide.
B) Higher oxygen levels resulted in the proliferation of aerobic bacteria;their respiration released large amounts of carbon dioxide.
C) Higher temperatures caused an increase in plant growth,resulting in an increase in the amount of carbon dioxide synthesized.
D) Lower temperatures resulted in reduced plant growth;with less vegetation to absorb carbon dioxide,the carbon dioxide levels rose.
E) Higher oxygen levels promoted large-scale fires across the landscape;the breakdown of organic molecules in these fires released carbon dioxidE.
G) B) and C)
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A) Liverworts
B) Mosses
C) Ferns
D) Pine trees
E) Roses
G) D) and E)
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A) Monocots have only one pistil per flower whereas eudicots have three.
B) Monocots have only one cotyledon whereas eudicots have two.
C) Monocots have only one stamen per flower whereas eudicots have six.
D) Monocots are monophyletic whereas eudicots have multiple origins.
F) A) and C)
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B) False
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