What role does lignin play in a plant's adaptation to life on land?
A) Prevents drying out
B) Strengthens the cell wall to allow plants to stand up straight and tall
C) Anchors the plant in the soil to allow plants to grow tall
D) Transports nutrients throughout the plant
B
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Nondisjunction can occur at either the first or second division of meiosis. XXY individuals could arise from nondisjunction at the ________ meiotic division in the ________.
A) first; mother B) second; mother C) first; father D) second; father E) More than one of the choices could give rise to XXY individuals.
Which statement is true?
a. Charophytes belong to the polyphyletic group Streptophta. b. Plasmodesmata persist in mature forms of chlorophytes. c. Charophytes divide along cell plates called phragmoplasts. d. Both chlorophytes and land plants show apical growth.
The fertility drug clomiphene causes a woman to
A) produce more oocytes. B) ovulate more than one oocyte a month. C) ovulate more than one time a month. D) have only one menstrual period a year.
Charles Darwin observed an orchid flower with very long, thin tubes that prevent many species from feeding on the flower nectar and pollinating the flower. He offered a prediction that some species of pollinators would eventually be found that can feed and pollinate through the small tube. You decide to test Charles Darwin's proposal by placing nets over some orchids that allow small pollinators to enter, but prevent the large sphinx moth from entering. You then compare the number of seeds produced by plants with and without the nets. The seed production is
A. a hypothesis. B. a standardized variable. C. a theory. D. an independent variable. E. a dependent variable.