Which statement best describes the role of the megaspore in angiosperm reproduction?
A) The megaspore produces the egg-containing embryo sac.
B) The megaspore develops into a seed.
C) The megaspore develops into the anther.
D) The megaspore produces pollen grains.
Answer: A
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Which of the following represents an activity
within a population?
a. a fox consuming a rabbit b. the absorption of nitrogen by bacteria and converting it to a form useful to plants c. a peacock spreading and shaking his feathers to attract a female d. moss growing on the north side of a large pine tree e. a virus causing rabies in a dog
What is a type of postzygotic reproductive isolating mechanism?
a. temporal isolation b. mechanical isolation c. behavioral isolation d. hybrid sterility e. sexual deselection
The major source of free oxygen that supports life on Earth is the ________
Fill in the blank(s) with correct word
If the complex protein assemblage of the prokaryotic flagellum arose by the same general processes as those of the complex eyes of molluscs (such as squids and octopi), then _____
A) natural selection cannot account for the rise of the prokaryotic flagellum B) ancestral versions of this protein assemblage were either less functional or had different functions than modern prokaryotic flagella C) neither eyes nor flagella could have arisen by evolution because both are too complex to have evolved D) the need for more complex structure must have driven evolution