An embryo sporophyte, its reserves of food, and the seed coat are collectively referred to as a ________
a. nut
b. seedling
c. fruit
d. seed
d
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The zone of soil that surrounds the roots and contains a variety of organic exudates is called the
A. mycorrhizae. B. rootsphere. C. rhizosphere. D. geosmin.
Budding and binary fission are examples of what?
a. asexual reproduction b. sexual reproduction c. internal fertilization methods d. external fertilization methods
Which of the following choices is the ultimate cause of the ability of male zebra finches to
discriminate between the songs of established neighbors and those of strangers?
a. Cells in a nucleus in the forebrain fire more often when the song of a new male is heard. b. Neurons cease to respond to the sound of an established neighbor. c. Zebra finches are genetically programmed to tolerate territory-holding neighbors but repel invaders. d. Zebra finches are capable of selective learning. e. This adaptation allows males to produce more offspring by saving their energy for real battles.
What evidence supports the idea that some nuclei are totipotent?
a. Nuclei taken from the cells of an embryonic frog can direct a frog egg to develop into a tadpole. b. Nuclei taken from the cells of a frog embryo can direct any amphibian egg to develop into a tadpole. c. Nuclei taken from a different species can direct a tadpole egg to develop into a normal tadpole. d. Some cells are capable of undergoing unlimited cell cycles.
e. Some cells are capable of arresting their cell cycle at will.