Approximately what proportion of the radiant energy entering an ecosystem is used in photosynthesis?
a. 1%
b. 4%
c. 10%
d. 50%
e. 75%
a
You might also like to view...
Site-specific recombination systems
A. depend on enzymes that are often specific for sequences within the host. B. do not depend on extensive nucleotide sequence homology. C. are features of some viruses. D. All of the choices are correct.
Which of the following statements is NOT true of megaspores?
A. Megaspores produce female gametophytes. B. Megaspores are larger than microspores. C. A megaspore is a kind of spore of a seed plant. D. The cells of the walls of the megasporangium are diploid but the megaspores themselves are haploid. E. Megaspores are diploid.
What is the first piece of information that is used in the identification of an unknown bacterial isolate?
A. The ability of the bacterial isolate to ferment glucose B. The Gram stain morphology C. The ability of the bacterial isolate to ferment lactose D. The presence of catalase enzyme
The seed develops from the ____
a. gametophyte b. ovary c. ovule d. pollen grain e. zygote