Photoperiodism is the ____
a. duration of flowering in a plant
b. amount of light needed by a plant to exhibit normal growth
c. biological response of a plant to a change in the length of daylight relative to darkness
d. light phase of photosynthesize during which photolysis of water occurs
e. time of the day when light shines with the most intensity
ANSWER: c
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Tetanus differs from botulism in that
A. muscles cannot relax in tetanus, while muscles cannot contract in botulism. B. tetanus results in flaccid paralysis, while botulism paralysis is rigid. C. there is a vaccine for botulism but not for tetanus. D. tetanus results from an exotoxin, botulism from an endotoxin. E. All of the choices are correct.
what is tolerance?
What will be an ideal response?
Where is chlorophyll found in a plant cell?
A) stroma B) thylakoid membranes C) cytoplasm D) cristae
In sticklebacks, females prefer to mate with males that have higher red color intensity. Why is the figure below consistent with runaway sexual selection as an evolutionary mechanism for the evolution of this preference?
a. Environmental factors cause brothers and sisters to have corresponding degrees of preference and intensity. b. Male trait and female preference are genetically correlated. c. Male trait and female preference are caused by the same genetic locus. d. The data shown in the figure are not consistent as they are far too noisy. e. B and C.