A milkweed plant discourages consumption by herbivores by
a. exuding a toxic sap.
b. developing an appearance that mimics an undesirable plant.
c. having hairy leaves.
d. producing an undesirable scent.
e. having thorns.
A
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If you were building an eye to function primarily in low light, but preserve some ability to perceive color, you would construct it using
A. all cones. B. all rods. C. mostly rods with some cones. D. mostly cones with some rods.
When biologists Hetz and Bradley measured the oxygen concentration inside the tracheae of Atlas moth pupae, what hypothesis were they testing?
A. Discontinuous breathing protects against too much oxygen. B. Discontinuous breathing decreases water loss. C. Discontinuous breathing helps underground insects avoid high levels of carbon dioxide. D. Discontinuous breathing saves energy by not moving the diaphragm. E. Discontinuous breathing is harmful because less oxygen is taken up.
One of the major differences between the first and second line of defense is that
A. the first line defenses are anatomical barriers whereas the second line defenses are mechanisms. B. the first line defenses are mechanisms whereas the second line defenses are physical barriers to infection. C. the first line defenses involve the respiratory tract whereas the second line defenses involve the gastrointestinal tract. D. the first line defenses involve complement proteins whereas the second line defenses involve antibodies.
In an infertile cycle, the endometrium is shed primarily because blood levels of ______ decline.
A. fertilin B. follicle-stimulating hormone C. progesterone D. testosterone