Word: oak
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...Riddiford and Williams repeated the experiment with a variety of trees and found that in all except oak, no mating occurred...
...Harvard biologists have found that when the female polyphemus moth, receives the vapor from the oak through its antennae, it releases a chemical--a sex pheromone--which activates the male...
...Only Oak...
...Oak is the only plant which activates sexual activity." Dr. Riddiford said...
Unwilling to wait until spring, when the moths could be mated outside, Dr. Riddiford placed the moths in a cage with oak seedlings. These moths and a pair in a nearby cage mated...