On a short-term basis, water loss in plants may be controlled by the
A. bending of the petioles on the leaves.
B. closing of the stele in the roots.
C. closing of the stomata in the leaves to limit transpiration.
D. opening of the stomata in the leaves to allow more carbon dioxide to enter.
E. opening the Casparian strips in the roots.
C. closing of the stomata in the leaves to limit transpiration.
When water needs to be conserved, guard cells block the openings of the stomata. This prevents water loss due to transpiration.
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Menstrual flow results in the discharge of
a. the follicle. b. the corpus luteum. c. the lining of the uterus. d. surface cells from the vagina. e. blood from the blood vessels on the outer surface of the uterus
Tay-Sachs disease is a genetic disorder in which fat deposits build up in nerve cells of the brain, leading to a slow loss of function. Because this disease usually strikes children under 1 year of age, the symptoms are not immediately apparent
Think about the symptoms that this condition would cause. List some that you think are possible. What would be the inevitable end result as the disease progresses?
In order to be considered extinct, a species can't be found
A) at all, in the wild or in captivity at the present time. B) at all, presently or during the past 10 years. C) at all, presently or during the past 50 years. D) in the wild presently but may exist in captivity.
A population grows exponentially when
A) the death rate equals the birth rate and immigration is equal to emigration. B) the carrying capacity is exceeded. C) emigration exceeds immigration and the birth rate equals the death rate. D) the birth rate and the death rate are equal. E) the birth rate exceeds the death rate and immigration exceeds emigration.