Angiosperms have two types of xylem tubes, each composed of one cell type, either ____ or ____.
A. vessel elements; companion cells
B. sieve elements; companion cells
C. sieve elements; tracheids
D. vessel elements; sieve elements
E. vessel elements; tracheids
Answer: E
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The ____ meristems are the source of new cells that allow plants to grow in diameter
Fill in the blank with the appropriate word.
Whisk ferns, club mosses, and horsetails have all the following characteristics in common with ferns except
A. all of these plants are seedless tracheophyte plants. B. all of these plants produce flagellated sperm. C. all of these plants form antheridia and archegonia. D. all of these plants require free water for the process of fertilization to occur. E. all of these plants have no vascular tissue.
Prokaryotes reproduce by ___________, which creates _____ exact daughter cell clone(s) of the original parent cell.
a. trinary fission; three b. sexual fission; one c. binary fission; two
Heavy cigarette smoking and the use of alcohol throughout pregnancy usually increase the likelihood of
A. the birth of twins B. the birth of a male baby C. a baby being born with a viral infection D. a baby being born with medical problems