Which phylum consists of vascular, seed-bearing plants and has about 185 known living species?
a. Cycadophyta
b. Gnetophyta
c. Coniferophyta
d. Anthophyta
Answer: a. Cycadophyta
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Plant hormones _____
A) in plant cells naturally exist in very large amounts B) change their shape in response to stimulus C) are unable to move from one cell to another D) affect only cells with the appropriate receptor
Soil particles composed of decomposing organic matter are called ____
a. sand b. humus c. silt d. clay e. mineral
Which of these naturalists synthesized a concept of natural selection independently of Darwin?
a. george lyell b. alfred wallace c. jean baptiste de lamarck d. charles lyell e. george-louis buffon
Which of the following hormones are believed to be involved in abscission?
A. gibberellin B. ethylene C. auxin D. All of the answer choices are correct.