In Utah there is a clone of aspen trees that covers over 100 acres. Such clones can be considered to be a single plant with many stems. It appears that the first stem of this clone originated over 80,000 years ago, even before there were humans in North
America. What likely contributes most to the long-term survival (long life span) of aspens?
A) If parts of the organism (clone) are damaged, there are still other parts that can continue growing.
B) All parts of the clone carry the same genes.
C) A shared root system means that all stems receive the same nourishment.
D) Sexual reproduction can occur more frequently in clones.
Answer: A
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Fill in the blank(s) with the appropriate word(s).
When guard cells swell, _____
a. transpiration ceases c. a stoma opens b. sugars enter phloem d. root cells die
The reactions of the citric acid cycle take place in the matrix of the mitochondrion
__________________ Indicate whether the statement is true or false.
Darwin used the phrase struggle for existence to describe the competition among organisms for the resources needed to survive. What condition would increase the struggle for existence experienced by members of a population?
a) All of the other answer choices b) an increase in the population's food supply c) an increase in the size of the population's environment d) an increase in birth rate among members of the population