Give examples of plants in each of the gymnosperm phyla. Differentiate among them with respect to
morphology and reproductive characteristics. Which is the most diverse? Least diverse? What will be an ideal response?
Concepts to Consider: Phylum Coniferophyta, the pines and firs; phylum Cycadophyta, the cycads;
phylum Ginkgophyta, the ginkgo tree; and phylum Gnetophyta (Ephedra, Gnetum, and Welwitschia).
Conifers are the most diverse; ginkgos comprise a single species.
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Explain the role of the following components in the experiment on carbon dioxide production.
(a) germinating corn seeds: (b) ungerminated (dry) corn seeds: (c) germinating, boiled corn seeds: (d) phenol red solution:
Which best describes a dominant species?
a. A dominant species is the only species in an area. b. A dominant species has low genetic diversity. c. A dominant species has high species richness. d. A dominant species has a high relative abundance. e. A dominant species has a low relative abundance.
During the termination stage
a. a start codon enters the ribosome. b. release factors separate the ribosomal subunits. c. mRNA attaches to the ribosome and the polypeptide chain. d. ribosomal subunits join. e. a stop codon enters the ribosome.
All of the following can contribute to
desertification EXCEPT a. drought. b. overplowing. c. overgrazing. d. natural fertilizer. e. All of these can contribute to desertification