A researcher is investigating the morphology of complete flowers. Which of the following organs must his flowers contain?
A. Calyx, corolla, carpels, and pistils
B. Calyx, corolla, stamens, and anthers
C. Calyx, corolla, androecium, and gynoecium
D. Calyx, corolla, receptacle, and carpels
E. Calyx, corolla, carpels, and ovules
Answer: C
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Scientists study microorganisms on Earth today to search for life forms elsewhere, as well as to explore the origins of life on Earth. These microorganisms that are studied are referred to as:
A. extirpated. B. extant. C. existing. D. extinct.
Intertidal mud flats in tropical regions are typically composed of
A) salt marshes. B) peatlands. C) mangrove forests or mangals. D) oysterbeds.
Which organisms represent the common ancestor of all photosynthetic plastids found in eukaryotes?
A) autotrophic euglenids B) diatoms C) dinoflagellates D) red algae E) cyanobacteria
How is the reaction 2H2 + O2? 2H2O described in words?
A) Two molecules of hydrogen combine with two atoms of oxygen to form two molecules of water. B) Two molecules of hydrogen combine with two molecules of oxygen to form two molecules of water. C) Two molecules of hydrogen combine with one molecule of oxygen to form two molecules of water. D) Two atoms of hydrogen combine with one atom of oxygen to form two atoms of water. E) Two atoms of hydrogen combine with two atoms of oxygen to form two molecules of water.