Double fertilization occurs when
A. the sperm and tube nuclei fertilize the egg.
B. two sperm cells fertilize the two polar nuclei.
C. one sperm fuses with the egg and the other sperm fuses with both polar nuclei.
D. the polar nuclei fuse with the egg after it has fused with the sperm.
C. one sperm fuses with the egg and the other sperm fuses with both polar nuclei.
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If isolated plant cells with a water potential averaging -0.5 MPa are placed into a solution with a water potential of -0.3 MPa, which of the following would be the most likely outcome?
A) The pressure potential of the cells would increase. B) Water would move out of the cells. C) The cell walls would rupture, killing the cells. D) Solutes would move out of the cells. E) The osmotic pressure of the cells would decrease.
Based on the following gel plate, which juvenile(s) could be the offspring of the adult male
and female?
This animal has radial symmetry, a
gastrovascular cavity, and the same opening is for the entry of food and expulsion of waste. It is ___.
a. a cnidarian b. a flatworm c. an annelid d. a mollusk e. more than one of these
Which of the following are used by species for navigation? (Check all that apply.)A) LandmarksB) Magnetic fieldsC) Phases of the moonD) StarsE) The sun
What will be an ideal response?