Heavy rains cause water speed in a river to increase and the river to overflow its banks. A scientist who has studied the river wants to determine the effects of this rain event on the river's ecological community. How could the scientist safely investigate these effects?
a) by sampling organisms directly during and after the rain event
b) by sampling organisms directly only after the rain event
c) by setting out equipment to measure water flow during the rain event
d) by taking pictures during and after the rain event
Ans: b) by sampling organisms directly only after the rain event
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Why does the efficiency of sugar production decrease when stomata are closed in C3 plants?
a. Accumulated oxygen outcompetes carbon dioxide for rubisco's active site. b. Depleted carbon dioxide outcompetes oxygen for rubisco's binding site. c. Accumulated oxygen inhibits rubisco's function. d. Depleted carbon dioxide inhibits rubisco's function. e. Depleted carbon dioxide activates rubisco's function.
The nitrogen cycle on land begins with ____
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At what stage does the diploid zygote form?
a. When the sperm nucleus and the egg nucleus fuse b. When the female cone begins to bud from the tree c. When the seeds drop from the tree d. When the pollen tube begins to grow