Which plant organelle stores solutes and plays a major role in maintaining turgor pressure?
a. nucleus
b. cell wall
c. chloroplast
d. vacuole
e. mitochondrion
ANSWER: d
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In 1909, Charles Walcott discovered fossils in the Burgess Shale of the Canadian Rockies. The area was formed by an underwater mudslide that provided an oxygen free environment, so decomposition was minimal. Why was this site particularly important to the fossil record?
A. It contained fossils from the Cambrian period. B. It contained both vertebrate and invertebrate fossils. C. It contained fossils of well preserved soft tissues of invertebrates. D. It showed that mudslides could occur underwater. E. The first bird fossil, Archaeopteryx, was found here.
Which of the following would allow optimal population growth?
a) unlimited resources b) accumulation of waste products c) predation d) competition e) limited access to food and water
You are "living off the grid" meaning that you are not using any public utilities: no water supply, sewer connection, natural gas, or electricity. You do have a septic tank, whose pipe carries sewage underground where it is released over a wide area, the leaching field. There is also a small pond out there that you have stocked with fish. However, you notice that the fish are floating dead in the water, and the pond has a green scum on it. What happened?
A. There are not enough nutrients in the water, so the fish died. B. Chemical toxins from your septic tank cleaner have killed the fish. C. There is oxygen depletion in the pond due to the leakage of phosphates and other compounds from your septic tank. D. The fish died due to a lack of calcium, which then caused the algae to overgrow.
In flatworms, the ____ is/are used to gather food
a. nephridia b. contractile vacuoles c. Malpighian tubules d. pharynx e. flame cells