The letter "A" from the above figure represents

a. ectoderm.
b. endoderm.
c. mesoderm.
d. neural plate.
e. yolk


D

Biology & Microbiology

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In the Calvin cycle, NADPH is __________

A. oxidized B. reduced C. phosphorylated D. oxidized and reduced E. None of the answer options is correct.

Biology & Microbiology

Represented by only two living genera, Psilotum and Tmesipteris, ____ resemble the extinct Cooksonia. Having no

true roots or leaves, these seedless vascular plants are essentially forking green stems.

a. mosses b. whisk ferns c. ferns d. club mosses e. horsetails

Biology & Microbiology

With ____ selection(s), the intermediate form

of a trait is favored.

a. stabilizing b. directional c. disruptive d. frequent e. none of these

Biology & Microbiology

Which of the following structures in the life

cycle of a plant are diploid?

a. spores b. gametophytes c. gametes d. sporophytes e. all of these are diploid

Biology & Microbiology