Some plants can tolerate flooding conditions by
A. formation of aerenchyma.
B. opening their lenticels.
C. forming additional adventitious roots.
D. shedding their bark.
E. pumping water out of their roots.
A. formation of aerenchyma.
Flooding reduces oxygen availability to the plant. Many plants that have evolved in environments with standing water have a tissue called aerenchyma. This tissue contains large air spaces that helps facilitate the flow of oxygen from the parts of the plant above water to those parts submerged in water.
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An X-linked recessive gene (c) produces red-green color blindness. A normal woman whose father was color blind
marries a color-blind man. (a) What are the possible genotypes for the mother of the color-blind man? (b) What are the possible genotypes for the father of the color-blind man? (c) What are the chances that the first son will be color blind? (d) What are the chances that the first daughter will be color blind? What will be an ideal response?
The chromosomes detach from one another and become visibly separated during
a. anaphase. b. metaphase. c. interphase. d. prophase. e. telophase.
In natural communities, some feedback mechanisms operate whenever populations change in size;
they are a. density-dependent factors. b. density-independent factors. c. always within the individuals of the community. d. always outside the individuals of the community. e. the same as genetic drift.
The genes discovered to date account for only about 5-10% of the total variation in adult height
a. True b. False