Photoperiodism is the ____
a. duration of flowering in a plant
b. amount of light needed by a plant to exhibit normal growth
c. response of a plant to the duration of light and darkness
d. light phase of photosynthesis during which photolysis of water occurs
e. opposite of photorespiration
ANSWER: c
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A wheat farmer is concerned that his land has been depleted of nitrogen. What steps can he take to make sure his wheat crops have enough nitrogen for the next season? Select all correct choices
A. He can plant alfalfa on his land and let it serve as "green manure." B. He can treat his land with man-made fertilizers, thanks to Haber and Bosch. C. He can continue to plant his wheat crops, as wheat can form root nodules. D. He can treat his land with phosphate fertilizers.
When a gazelle senses a predator, which action(s) are under voluntary, or conscious, control? Select all correct choices
A. running B. faster heart beat C. dilation of blood vessels supplying the muscles
In order for an earthworm to lengthen several contiguous segments of its body, it must
A. contract its longitudinal muscles, which pulls up the chaetae and moves the body fluid perpendicular to the long axis of the worm. B. contract its longitudinal muscles, which extends the chaetae into the surrounding soil and moves the body fluid parallel to the long axis of the worm. C. contract its circular muscles, which extends the chaetae into the surrounding soil and moves the body fluid parallel to the long axis of the worm. D. contract its circular muscles, which pulls up the chaetae and moves the body fluid parallel to the long axis of the worm. E. contract its circular muscles, which extends the chaetae into the surrounding soil and moves the body fluid perpendicular to the long axis of the worm.
An insertion sequence is distinguishable from other mobile genetic elements because ________.
A. it encodes a transposase B. it is composed of DNA C. it is highly complex D. it is smallest