The male part of a flower includes the:
a. carpel only
b. stigma only
c. style only
d. anther only
e. both the style and anther
d
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A farmer uses triazine herbicide to control pigweed in his field. For the first few years, the triazine works well and almost all the pigweed dies; but after several years, the farmer sees more and more pigweed. Which of these explanations best explains what happened?
A) The herbicide company lost its triazine formula and started selling poor-quality triazine. B) Natural selection caused the pigweed to mutate, creating a new triazine-resistant species. C) Triazine-resistant pigweed has less-efficient photosynthesis metabolism. D) Triazine-resistant weeds were more likely to survive and reproduce.
Respiration is measured in a human. How do the concentrations of O2 and CO2 in inhaled air compare with exhaled air?
A. Inhaled air has less O2 and more CO2 than exhaled air. B. Inhaled air has more O2 and less CO2 than exhaled air. C. Inhaled air has more O2 and CO2 than exhaled air. D. Inhaled air has less O2 and CO2 than exhaled air.
Which of the following is the end goal of a negative feedback system?
A. Hybridization B. Reproduction C. pH adjustment D. Homeostasis E. Evaporation
Which of the following is a correct partial sequence of the structures through which blood flows in a single pass through the human circulatory system?
A. left atrium, left ventricle, aorta, arteries, capillaries. B. capillaries, veins, vena cava, right atrium, right ventricle. C. right atrium, right ventricle, pulmonary arteries, capillaries. D. capillaries, pulmonary veins, left atrium, left ventricle. E. all of the above. F. none of the above.