The two leaflike organs which may flank the base of the petiole where it joins the stem are called
A. blades.
B. palisades.
C. Casparian strips.
D. stipules.
E. pericycles.
Answer: D
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The person who made a lasting impression in the science of genetics with his study of traits in pea plants was
A. Charles Darwin. B. Frederick Griffith. C. Robert Hooke. D. King George III. E. Gregor Mendel.
Soil Consists of:
a. rock particles of various sizes b. minerals c. microorganisms d. organic matter from dead organisms e. All of the above
Which of the following factors has an effect on the quality of soil resources?
a) plowing b) deforestation c) desertification d) all of the other choices
Flukes are divided into the groups Monogenea and Digenea. Monogenea have a posterior holdfast with hooks, clamps, and suckers, while Digenea have suckers but never hooks and clamps. Monogenea have only one host in the life cycle and usually live on gills or skin of fish and amphibians. Digenea have at least two hosts, and are named for having two reproductive states in their life cycle (an adult and intramolluscan phase).Based on this information, the blood fluke Schistosoma would be classified as
A. an endoparasite and Monogenean. B. an ectoparasite and Monogenean. C. an endoparasite and Digenean. D. an ectoparasite and Digenean.