Almost all houseplants, woody ornamentals, and orchard trees are clones grown from ____of a parent plant
a. root fragments
b. stem fragments
c. leaves
d. pollinated flowers
e. seeds
ANSWER: b
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Support for the succession mechanism of tolerance is found in research on plant communities that shows
A. that plants release toxins that prevent other species from establishing. B. succession is random and cannot be predicted by existing species. C. climax communities never form as predicted by Clements. D. succession is determined largely by species that exist in the ground as seeds or old roots. E. competition-tolerant species colonize first.
Which of the following statements about the relationship between ants and acacia trees is/are accurate? Check all that apply.
_____ The ants protect the acacias from other insects. _____ The ants protect the acacias from epiphytic plants and vines. _____ The ants live in the hollow thorns of the acacias. _____ The ants are provided with sugar or other nutrition by some species of acacia. _____ The ants aid pollination of the acacias.
Which of the following could be used to demonstrate a homeostatic mechanism?
a. city buses transporting people from their houses to their jobs b. water stored behind a dam being released to make electricity c. a hot water heater keeping the water temperature near 100 degrees d. a series of underground passageways connected to a large building e. the seasonal changes that occur in the daily temperature
Which of the following must be true for a female to have hemophilia?
a. Her mother is not a carrier and her father has the disease. b. Her mother is homozygous normal and her father is a carrier. c. Her father and mother are heterozygous. d. Her mother is a carrier and her father has the disease. e. Her father is heterozygous.