What is the significance of double fertilization in flowering plants? What will be an ideal response?
Concepts to Consider: Two sperm cells travel down the pollen tube into the ovary. One
sperm cell unites with the egg to form the zygote, while the other sperm cell unites with the
two polar nuclei in the ovule to form the triploid endosperm. Endosperm is a nutritive tissue
for the developing embryonic plant. Following these two cell fusions, the ovule develops into
a seed, and the ovary develops into a fruit.
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When we say "populations evolve, not individuals," what does this mean?
A. Evolution does not happen. B. Individuals cannot change, but genotype frequencies in a population can change. C. Evolution is the same thing as change in genetic makeup in a population over time. D. Only alleles change over time, not genotype frequencies. E. Only genotype frequencies change over time, not alleles.
What evolutionary advantage do prokaryotes have over eukaryotes?
What will be an ideal response?
The four phyla of the gymnosperms are
A. conifers, monocotyledons, dicotyledons, and cycads. B. monocotyledons, dicotyledons, conifers, and cycads. C. conifers, cycads, ginkgos, and gnetophytes. D. horsetails, true ferns, whisk ferns, and club mosses. E. mosses, liverworts, club mosses, and hornworts.
This animal has a small coelom, soft body, a
hinged two-part shell, and no distinct head. This animal is ___.
a. a clam b. a slug c. an octopus d. a planarian e. more than one of these