Microspores are indicated by the letter ____
a. A
b. B
c. C
d. D
e. E
ANSWER: b
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There are different types of microscopes that can be used to provide information about cells. Which type of microscope is used for the observation of living cells?
A) light microscope B) scanning electron microscope C) transmission electron microscope
Which statement about early embryonic development in humans is FALSE?
a. The embryo is moved along the oviduct by ciliary action and muscular contraction. b. The embryo develops through the blastula stage while floating free in the uterus. c. The embryo enters the uterus about 24 hours after fertilization. d. Early division of the embryo occurs in the oviduct. e. Implantation of the embryo occurs about seven days after fertilization.
The most common kind of dispersion in nature is
A) clumped. B) random. C) uniform. D) indeterminate. E) dispersive.
What makes a mineral element essential for plant growth?
A. As its concentration increases, the plant grows more. B. It can only be found in organic fertilizers. C. If it is missing, the plant cannot grow or reproduce normally. D. It contributes to the solute potential of the plant. E. It is part of typical chemical fertilizers.