Whisk ferns, club mosses, and horsetails have all the following characteristics in common with ferns except:
A. all of these plants are seedless tracheophyte plants.
B. all of these plants produce flagellated sperm.
C. all of these plants form antheridia and archegonia.
D. all of these plants require free water for the process of fertilization to occur.
E. all of these plants have no vascular tissue.
Answer: E
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Blood returning to the mammalian heart in a pulmonary vein will drain first into the
A. vena cava. B. left atrium. C. right atrium. D. left ventricle. E. right ventricle.
Primary consumers are found at
a. the lowest trophic level. b. the highest trophic level. c. the second trophic level. d. all trophic levels. e. the third trophic level.
Vessel elements and tracheids, while differing slightly in structure, both conduct carbohydrates. Indicate whether the statement is true or false
A small child presents to the pediatric office with a reddened sclera, itchy eyes, and a watery, clear discharge from the affected eye. The most likely diagnosis is
A) viral conjunctivitis. B) trachoma. C) bacterial conjunctivitis. D) either bacterial conjunctivitis or trachoma; further tests are needed. E) cannot be distinguished between bacterial or viral conjunctivitis so antibiotic treatment is given regardless.