During the Carboniferous Period, the competitive
edge was held by plants
a. with well-developed gametophytes.
b. with cuticles.
c. with lignin-reinforced tissues.
d. with underground stems.
e. that produced seeds.
Answer: c
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Some species of Acacia have co-evolved with species of ______, which actively defend the plant from browsing animals and even vines
A. beetles B. aphids C. ants D. scorpions E. biting flies
Some of the olfactory receptor (OR) genes in humans
A. have been inactivated, reducing our olfactory capabilities compared to other primates. B. have been conserved more rigidly, resulting in increased orthologs compared to other primates. C. have duplicated more frequently, resulting in increased paralogs compared to other primates. D. have been activated, enhancing our olfactory sense compared to other primates.
Photosynthetic organisms convert the energy of ______ into chemical energy.
a) Electrons b) Protons c) Photons d) Hydrogen atoms
The oxygen released in photosynthesis comes from
A. carbon dioxide B. glucose C. ribulose biphosphate D. water E. atmospheric oxygen