Which is the correct horizontal pathway of water from the soil to the center of the root?
a. epidermis ? root hair ? cortex ? pericycle ? endodermis ? xylem
b. epidermis ? cortex ? pericycle ? endodermis ? phloem ? xylem
c. root hair ? epidermis ? cortex ? endodermis ? pericycle ? xylem
d. root hair ? cortex ? endodermis ? pericycle ? epidermis ? xylem
e. root hair ? epidermis ? endodermis ? cortex ? xylem ? phloem
C
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Why is photorespiration more likely in warm weather?
a. Plants require warm weather (at least 23?C) to drive photosynthesis. b. Plants are more likely to close their stomata in the daytime heat than at night when it is cool. c. Plants are more likely to dehydrate in warm weather, forcing them to close the stomata to conserve water; this prevents CO2 from entering the leaf. d. The rubisco enzyme is very temperature sensitive and becomes less selective in warmer temperatures, allowing it to fix O2 instead of CO2. e. Plants use up the water in their central vacuoles in warm weather inhibiting the waterrequiring light reactions; this in turn alters the activity of rubisco.
Why do land dwelling insects drown when they are in water?
a. They are unable to ventilate. b. Their lungs are functioning too fast to sustain life. c. They cannot respire across their body surface. d. They are unable to ventilate because their spiracles are underwater. e. Their gills are too moist.
Which of the following would violate the assumptions of the molecular clock?
A) comparison of genes of a species that lives deep in the ocean with relatives that live on the surface and are exposed to strong mutation-inducing ultraviolet radiation B) comparison of genes for homologous structures across many species C) comparison of many genes in many species of insects that undergo metamorphosis D) assuming that organisms in competitive environments have the same rate of mutation as those in noncompetitive environments
You find a wormlike, soft-bodied adult animal in a mudflat. It is bilaterally symmetrical, is segmented, has a true coelom, and has a complete digestive tract. Based on these characteristics, what phylum does the animal represent?
A) Cnidaria B) Platyhelminthes C) Nematoda D) Annelida