Ecological efficiency, the percentage of energy at one trophic level that ends up in tissue in the next level, is about:
a. 1 to 5 percent
b. 1 to 20 percent
c. 5 to 30 percent
d. 10 to 40 percent
e. 50 to 60 percent
c
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Which of the following is true concerning root
nodules? a. They may kill a plant. b. They are produced by a fungus. c. They remove nitrogen compounds from the plant. d. They convert the harmful ammonia that plant cells produce into gaseous nitrogen. e. None of these are true
List at least three environmental agents or factors that are known to cause cancer
What will be an ideal response?
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
Which of the following is an unencapsulated dendrite of a sensory neuron?
a. Ruffini endings b. Pacinian corpuscles c. free nerve endings d. hair receptors