The atmosphere performs several essential ecological functions. One of these is to:
a. protect Earth from all infrared radiation.
b. reduce the amount of visible light reaching Earth
c. provide plants with nitrogen needed for photosynthesis
d. protect Earth from microwave radiation
e. protect Earth from most ultraviolet radiation
e
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The starting point for the ovarian cycle is a ____
a. primary oocyte arrested in meiosis I b. primary oocyte arrested in meiosis II c. primary oocyte having just completed meiosis I d. secondary oocyte arrested in meiosis I e. secondary oocyte arrested in meiosis II
What happens to a cell that is placed in an isotonic solution?
a. The cell swells. b. The cell shrinks. c. The cell stays the same size. d. The cell crenate.
Solar tracking is similar to _____
a. phototropism c. photoperiodism b. gravitropism d. thigmotropism
In human females, what process causes milk production?
A. Stimulation of the alveoli of the mammary glands by prolactin from the anterior pituitary gland. B. Stimulation of the alveoli of the mammary glands by oxytocin from the anterior pituitary gland. C. Stimulation of the alveoli of the mammary glands by prolactin from the posterior pituitary gland. D. Stimulation of the alveoli of the mammary glands by oxytocin from the posterior pituitary gland. E. Stimulation of the alveoli of the mammary glands by LH from the anterior pituitary gland.