Mesophyll cells are primarily responsible for:
A) photosynthesis.
B) regulating passage of carbon dioxide into the leaf.
C) protection of a leaf.
D) transport of water.
Answer: A
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What structure in the CNS do neurons from olfactory epithelium first transmit action potentials to?
A. amygdala B. accessory olfactory bulb C. olfactory bulb D. cerebral cortex E. cerebellum
Where does perception of sensory stimuli occur?
A. in all receptors B. in highly specialized receptors like hair cells C. at synapses in the peripheral nervous system D. only in the central nervous system
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
A population must have ________ for natural selection to occur.
A. a stable environment B. many individuals C. abundant resources D. heritable variation