Why do most angiosperms have alternate phyllotaxy, with leaf emergence at an angle of 137.5° compared to leaves above and below?
A) To allow maximum exposure to light
B) To promote a leaf area index above 8
C) To reduce shading of lower leaves
D) To allow maximum exposure to light and to reduce shading of lower leaves
D
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Which metabolic strategy is MOST common in chemolithotrophic mats?
A) ammonia oxidation B) iron oxidation C) nitrate reduction D) sulfur oxidation
The hair cells in the utricle detect
A) subsonic sound vibrations. B) volume and pitch of sounds. C) differences in air pressure waves. D) position of the head with respect to gravity.
What is the most likely consequence of a mutation that causes sporopollenin to degrade quickly after it is synthesized?
A. a decrease in the number of sperm that can be produced B. a reduction in the ability of pollinators to detect and transfer pollen grains to a stigma C. a decrease in the ability of the pollen grain or spore to open when a suitable location is found D. a reduction in the ability of the integument of an ovule to develop into a seed coat E. a reduction in the ability of pollen and spores to disperse to new areas
Salinity is expressed in parts per
a. hundred. b. thousand. c. ten thousand. d. hundred thousand. e. million.