The frustule of diatoms is made of:
a. cellulose.
b. calcium carbonate.
c. silica.
d. protein.
e. starch.
C
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The ten phyla of living land plants include:
A. (1) liverworts, (2) hornworts, (3) mosses, (4) lycophytes, (5) pteridophytes, (6) cycads, (7) ginkgos, (8) conifers, (9) gnetophytes, and (10) angiosperms B. (1) liverworts, (2) hornworts, (3) mosses, (4) lycophytes, (5) pteridophytes, (6) cycads, (7) ginkgos, (8) conifers, (9) gnetophytes, and (10) flowering plants C. (1) Hepatophyta, (2) Anthocerophyta, (3) Bryophyta, (4) Lycopodiophyta, (5) Pteridophyta, (6) Cycadophyta, (7) Ginkgophyta, (8) Coniferophyta, (9) Gnetophyta, and (10) Anthophtya D. (1) liverworts, (2) hornworts, (3) mosses, (4) lycophytes, (5) ferns, horsetails, and whisk-ferns, (6) cycads, (7) ginkgos, (8) conifers, (9) gnetophytes, and (10) flowering plants E. all the other choices provided are correct.
Which of the following is not a form of energy?
a. heat b. diffusion c. sound d. light e. gamma radiation
Imagine that you own a nursery and you want to reduce the chance that plants you ship will suffer
from shipping damage. Which type of plant hormone should you apply to the plants before shipping?
a. cytokinins b. abscisic acid c. oligosaccharins d. gibberellins e. ethylene
The two countries that make up the majority of the world's population are
a. the United States and China. b. China and Japan. c. the United States and India. d. India and Pakistan. e. China and India.