Which term refers to the landing platform for pollen in flowering plants?
a. the stigma
b. the filament
c. the style
d. the anther
Answer: a. the stigma
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Which of the following serves as a switching mechanism in the photoperiodic response in plants?
a. phytochrome b. auxin c. cryptochrome d. calmodulin e. phytoalexin
Homosexuality
A) is seen only in humans. B) reflects the input of a number of genes and environmental factors. C) is inherited from a mutation on the X chromosome. D) is only the result of environmental influences.
Which statement best describes why O2 and CO2 can both be exchanged simultaneously at the alveoli and pulmonary capillaries?
A) Nitrogen is at a high pressure in both the alveoli and pulmonary capillaries and drives the exchange of O2 and CO2. B) Blood in both the alveoli and pulmonary capillaries is at equilibrium. C) Each gas acts independently and diffuses down its own partial pressure gradient. D) Blood in the pulmonary capillaries is high in both O2 and CO2. E) Blood in the alveoli is high in both O2 and CO2.
Darwin's book in which he described his views on evolution is:
A. On the Origin of Species. B. Survival of the Fittest. C. On the Principle of Population. D. Principles of Geology.