Most of the water moving through a plant is
lost through
a. osmotic gradients in the soil.
b. evaporation.
c. pressure flow forces in the xylem.
d. photolysis.
e. photosynthesis
B
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What benefits do plant-eating animals receive from the bacteria that live in their guts?
What will be an ideal response?
What two gases have a profound effect on the type of organisms that can live in an area and influences the regions carrying capacity?
a. Carbon dioxide and nitrogen b. Carbon dioxide and bicarbonate c. Oxygen and carbon dioxide d. Oxygen and nitrogen
Which of the following is NOT a characteristic of cytokinin?
a. it affects meristem cell division b. it stimulates the development of lateral buds c. it inhibits the development of lateral roots d. it always has the same affect on cells as auxin does e. more than one of these is NOT a characteristic of cytokinin
The single most important organ system in coordinating our responses to a changing external environment is the ______ system.
A. nervous B. skeletal C. muscular D. endocrine