Which of the following is true of transport in phloem?
A. It occurs from sink to source.
B. It only occurs from leaves to roots.
C. It transports materials down the plant
body.
D. It is driven by turgor pressure.
E. It is usually a passive process.
D
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Zircon crystals form from volcanic rock. The age of zircon crystals can be precisely measured. What exactly is measured in zircon crystals?
What will be an ideal response?
The energy that fuels most life on earth comes from ____
a. the sun b. heat c. sucrose d. water e. glucose
Red blood cells are
a. erythrocytes. b. leukocytes. c. platelets. d. all of the above.
Most aquatic animals excrete ammonia, whereas land animals excrete urea or uric acid. What is the most likely explanation for this difference?
a. They have different diets. b. Land animals can get the energy needed to make urea or uric acid. c. Ammonia is very toxic, and it takes a lot of water to dilute it. d. Land animals cannot afford the energy needed to make ammonia. e. Fish need to get rid of ammonia, but land animals need it to live.