Which part of a plant absorbs most of the water and minerals taken up from the soil?
A) root cap
B) root hairs
C) the thick parts of the roots near the base of the stem
D) storage roots
B
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After a decline to an historic low about 300 million years ago, carbon dioxide levels in the Earth's atmosphere rose again for a while. Hypothesize a reason why this occurred.
A. All the vegetation that had been produced prior to the historic low decayed, releasing carbon dioxide. B. Higher oxygen levels resulted in the proliferation of aerobic bacteria; their respiration released large amounts of carbon dioxide. C. Higher temperatures caused an increase in plant growth, resulting in an increase in the amount of carbon dioxide synthesized. D. Lower temperatures resulted in reduced plant growth; with less vegetation to absorb carbon dioxide, the carbon dioxide levels rose. E. Higher oxygen levels promoted large-scale fires across the landscape; the breakdown of organic molecules in these fires released carbon dioxide.
Which element is not considered an essential micronutrient for plants in general, but is required by horsetails and
perhaps some grasses such as wheat?
a. gold b. boron c. silicon d. zinc e. magnesium
On which portion of the hemoglobin molecule does oxygen bind?
a. protein chain b. cholesterol side chains c. iron in the cytoplasm d. heme group e. nuclear side chains
2n is an abbreviation for
A. diploid. B. gametes. C. haploid. D. mitosis. E. meiosis