In angiosperm fertilization, a triploid cell that eventually becomes is produced by a second fertilization event

Aplant may open end close its stomata to prevent excess water loss and maintain

To determine if a particular plant is homozygous or heterozygous, you would have to test cross with a

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.