Liverworts and mosses utilize which of the following pigments for photosynthesis?
a. chlorophylls a and b.
b. carotenes.
c. xanthophylls.
d. all of the above.
b
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Indeterminate growth is a characteristic of which of the following plant organs?
A. flowers and roots B. shoots and roots C. leaves and flowers D. leaves and roots E. shoots and leaves
The most distinctive characteristic of leaf mesophyll cells is that they are filled with
A. central vacuoles. B. many chloroplasts. C. oxygen bubbles. D. veins. E. stomata.
In general, the pool of materials in living organisms is
a. much greater than the pool found in the physical environment. b. constantly changing over a wide range. c. usually equal to the pool found in the soil. d. about the same as the pool found in the physical environment. e. much less than the pool found in the physical environment.
Cells that have undergone a response that causes them to enter a permanent state of growth arrest, like those that comprise a mole are said to have entered a state called
a) adolescence b) senescence c) pubescence d) bellioscosityb) senescence