Bryophytes are small and simple. Some produce a flattened photosynthetic structure called a:
A. phallus.
B. thallus.
C. prometheus.
D. sporangium.
E. primordia.
B
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A black guinea pig crossed with an albino guinea pig produced twelve black offspring. When the albino was crossed with a second black animal, six blacks and six albinos were obtained. What is the best explanation for this genetic situation?
A) Albino is recessive; black is dominant. B) Albino is dominant; black is incompletely dominant. C) Albino and black are codominant. D) Albino is recessive; black is codominant.
In certain plants, some of the roots may be modified to carry out unusual functions. Which of these is not an example of one of these special functions?
A. help absorb oxygen B. store food or water C. carry out photosynthesis D. parasitize other plants E. discourage herbivores
Labor is directly triggered by the hormone ________, which also triggers ________ after birth
A) estrogen; milk production B) estrogen; milk ejection C) oxytocin; milk ejection D) oxytocin; milk production
Approximately what proportion of the radiant energy entering an ecosystem is used in photosynthesis?
a. 1% b. 4% c. 10% d. 50% e. 75%