This phylum of vascular, seed-bearing plants has about 185 known living species. Many of them look
like palm trees, and some produce massive strobili. Their male and female strobili are found on
separate plants.
a. Cycadophyta
b. Anthophyta
c. Gnetophyta
d. Coniferophyta
e. Ginkgophyta
A
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The vascular bundles of dicots separate the
ground tissue into two zones. Which of the following correctly describes the arrangement of these zones from outside to in? a. outermost xylem >>> phloem >>> pith >>> cortex b. outermost phloem >>> xylem >>> pith >>> cortex c. outermost cortex >>> phloem >>> xylem >>> pith d. outermost pith >>> phloem >>> xylem >>> cortex e. outermost cortex >>> xylem >>> phloem >>> pith
Which of the following would be more likely to
affect an animal’s habitat than its niche? a. rainfall b. prey abundance c. predators d. defense mechanisms e. competitors
The reason that some individual hormones have so many different effects is that
a. they influence gene transcription. b. they trigger a second messenger system that produces a cascade of effects. c. there are a great many different cells in different tissues that have specific receptors for the hormone. d. the hormone is carried throughout the body and only a small amount is needed to produce its effect. e. they are realeased in different concentrations.
Aspirin inhibits _______ synthesis.
a. abscisic acid b. vasopressin c. estrogen d. prostaglandin