Which step is NOT involved in the fertilization of angiosperm flowers?
A. Pollen is transported to a stigma of a flower.
B. When pollen reaches the stigma of a flower, it begins to grow a pollen tube that pierces the style.
C. The style of the pistil contracts to bring the sperm closer to the embryo sac.
D. The pollen tube grows until it reaches the ovule in the ovary.
E. Double fertilization produces an embryo and the endosperm.
C. The style of the pistil contracts to bring the sperm closer to the embryo sac.
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Living organisms are members of all of the levels
listed below; however, rocks are components of a. the community. b. the population. c. the ecosystem. d. the biosphere. e. both the ecosystem and the biosphere.
Scientists measured the pressure in the xylem of redwood trees at different heights and found that the higher they made their measurements, the lower the pressure. They extrapolated this to a pressure of zero, and concluded that the tallest a tree could grow is 122-130 meters. The tallest known tree on Earth is 112.7 meters. What assumption were the scientists making to conclude that when pressure was zero the plant could grow no further?
A. Any leaves above that point would not receive sunlight. B. Any leaves above that point would not receive water. C. Stems above that point could not transport sugars in their xylem. D. Transpiration would be less than uptake of water from the xylem. E. The osmotic pressure would be greater than gravity.
Which of the following is NOT an example of microbial antagonism?
A) acid production by bacteria B) bacteriocin production C) bacteria occupying host receptors D) bacteria causing disease E) bacteria producing vitamin K
Insect wings, bat wings, and the flaps of tissue between the limbs and body of "flying" squirrels are:
A) homozygous. B) homologous. C) abrupt. D) analogous.