How many chromosomes does a human sperm contain?
A. 1
B. 48
C. 24
D. 23
E. 46
Answer: D
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If a symbiont either harms or lives at the expense of another organism, the relationship is called ________.
A. parasitism B. pathogenicity C. commensalism D. symbiosis
Water may be lost in the form of liquid from the surface of leaves through a process known as
A. guttation. B. cohesion. C. phloem loading. D. mesophyll adhesion. E. aeration.
. A plant physiologist treats a leaf with abscisic acid and observes that the stomata close. What happened inside the guard cells during the experiment?
A. Abscisic acid influences the movement of sodium ions out of the guard cells. B. Abscisic acid influences the movement of potassium ions out of the guard cells. C. Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening. D. Abscisic acid binds with auxins and induces water molecules to exit the guard cells. E. Abscisic acid causes the guard cells to become more turgid.
Answer the following statements true (T) or false (F)
1.Gymnosperms are the flowering plants. 2.A seed is an embryo and its food supply is inside a seed coat. 3.The root and shoot apical meristems form at the same time in the plant embryo. 4.Seedless watermelons come from seeds that are triploid and therefore the seeds do not fully develop and form simple soft hulls that are easy to chew. 5.Coconuts are fruits containing seeds that are usually wind dispersed.