Prop roots are more common in:
a. annuals.
b. eudicots.
c. monocots.
d. epiphytes.
e. parasitic plants.
C
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The midrib of a leaf
(a) contains the midvein. (b) contains only xylem. (c) is part of the spongy mesophyll. (d) contains only phloem.
Implantation of an embryo normally has occurred by how long after fertilization?
A. 3 days B. 6 days C. 12 days D. 20 days E. 1 month
Cattle egrets hitch a ride on domestic cows and eat insects that are stirred up by their activity. What term describes this relationship?
A) commensalism B) competition C) predation D) parasitism
These two molecules are structural isomers. What is the difference between them?
A) the number of carbon atoms
B) the number of hydrogen atoms
C) the location of a double-bonded oxygen atom
D) Only one of them has a double bond between carbon atoms.