Which plants keep their stomata open only at night?
A. CAM
B. C3
C. C4
D. No plants keep their stomata open only at night
E. All plants do.
A. CAM
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Endosperm is
A. sperm after it has entered the archegonium. B. nutritive tissue produced within antheridia. C. sperm cells enclosed within pollen grains. D. tissue stored in seeds that provides nutrition for embryos. E. sperm produced at the end of the flowering season.
In which of the stages below are the chromosomes present as attached sister chromatids? I. metaphase II. telophase III. prophase IV. anaphase
a. III and IV b. I, III, and IV c. I and III d. I, II, and III e. I, II, III, and IV
Animals establish and defend territories only when ____
a. the effort does not endanger the life of the individual b. males compete for females by fighting c. females choose among displaying males d. some critical resource is in short supply e. territorial defense is not energetically costly
Which of these potential results of applying a metabolic poison to the rhizoids of Polytrichum should interfere the least with the ability to draw valid conclusions from this experiment?
A) If, upon dying, the rhizoids leak nitrogenous compounds into the soil before final nitrogen content is measured. B) If, upon dying, decomposition of the rhizoids introduces nitrogenous compounds to the soil before final nitrogen content is measured. C) If the metabolic poison is hydrogen cyanide (HCN) or sodium azide (NaN3), and much of the poison remains in the soil. D) If the metabolic poison acts against the mitochondria of the rhizoid cells. E) If the metabolic poison absorbs nitrogen and strongly adheres to soil particles, acting as a sort of glue.