One of the reasons study of nitrogen use in plants is of special interest is because
A. nitrogen in its atmospheric form is not useable by plants.
B. nitrogen is limited in our atmosphere.
C. nitrogen is not an essential element for plant growth.
D. none of the forms of nitrogen is easily absorbed by plants.
E. nitrogen is often toxic to plants.
Answer: A
You might also like to view...
High blood pressure in mammals reflexively causes a decrease in heart rate, which results in lowered blood pressure. This is a __________ because ____________
A. negative feedback loop; response to the signal results in a decrease of that signal B. negative feedback loop; response to the signal results in an increase of that signal C. positive feedback loop; response to the signal results in a decrease of that signal D. postive feedback loop; response to the signal results in an increase of that signal E. None of the above are correct.
Which of the following best describes the sexual life cycle of bread mold?
A. (1) Multinucleate gametangi are produced and compatible strains undergo plasmogeny, and form (2) a heterokaryotic zygosporangium. (3) Karyogamy of the haploid nuclei takes place to form many diploid nuclei and the zygosporangium develops into a thick-walled zygospore. (4) Meiosis occurs and produces many haploid spores, that (5) are dispersed in air and germinate when finding a suitable environment. B. (1) Multinucleate gametangi are produced and compatible strains undergo karyogamy and plasmogamy, and form (2) a heterokaryotic zygosporangium. (3) Meiosis of the diploid nuclei takes place to form many haploid nuclei and the zygosporangium develops into a thick-walled zygospore. (4) Fusion of haploid nuclei occurs and produces spores, that (5) are dispersed in air and germinate when finding a suitable environment. C. (1) Uninucleate gametangi are produced and compatible strains undergo plasmogeny and form (2) a dikaryotic zygosporangium. (3) Karyogamy forms a diploid nucleus and the zygosporangium develops into a thick-walled zygospore. (4) Meiosis of diploic nuclei occurs and produces four haploid spores, that (5) are dispersed in air and germinate when finding a suitable environment. D. (1) Multinucleate zygosporangia develop thick walls and undergo plasmogamy with compatible strains (2) to form a heterokaryotic gametangium. (3) Karyogamy of the haploid nuclei takes place to form many diploid nuclei and they develop into thick-walled spores. (4) These undergo plasmogamy and produce diploid spores, that (5) are dispersed in air and germinate when finding a suitable environment. E. (1) Multinucleate gametangi with diploid nuclei are produced and compatible strains undergo meiosis (2) to produce a heterokaryotic zygosporangium with haploid nuclei. (3) Karyogamy of these nuclei takes place to form diploid nuclei that have a dark, thick wall. (4) These develop into spores, that (5) are dispersed in air and germinate when finding a suitable environment.
Which of the following vertebral column levels has the thickest intervertebral disc?
A) between T12 and L1 B) between C7 and T1 C) between C1 and C2 D) All of the answers are correct. E) None of the answers are correct.
Populations can be described in terms of their diversity and stability
Indicate whether the statement is true or false.