Which specialized cells receive and respond to stimuli?
A) effectors
B) neurotransmitters
C) neurons
D) nerve impulses
C
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The movement of water through a membrane, from an area of high concentration to an area of low concentration, is known as
A) active transport. B) facilitated transport. C) passive transport. D) osmosis. E) photolysis.
Dry heat methods usually require lower temperatures and shorter exposure times than moist heat methods to achieve the same degree of killing because of the drying effects of this form of heat.
Answer the following statement true (T) or false (F)
What is the fate of the two-celled pollen that
germinates on a receptive stigma?
a. one cell becomes a pollen tube; the other cell becomes two sperm cells b. one cell becomes a pollen tube; the other cell becomes a single sperm cell c. one cell dies and the other becomes a sperm cell d. both cells undergo mitosis to form four sperm cells e. both cells become sperm cells
You see a plot of plants that is very dense and small and another plot of the same species with fewer individuals but larger individual plants. What might be the cause of this pattern?
A) herbivory B) contest competition C) water availability D) intraspecific competition