On a field trip, a student in a marine biology class collects an organism that has differentiated organs, cell walls of cellulose, and chloroplasts with chlorophyll a. Based on this description, the organism could be a brown alga, a red alga, a green alga, a charophyte recently washed into the ocean from a freshwater or brackish water source, or a land plant washed into the ocean. The presence of which of the following features would definitively identify this organism as a land plant?
A) alternation of generations
B) sporopollenin
C) rosette cellulose-synthesizing complexes
D) flagellated sperm
E) embryos
Ans: E) embryos
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A. Fluorescence microscopy B. Bright-field microscopy C. Transmission electron microscopy D. Scanning electron microscopy
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