Your friend has never gardened before. When none of the seeds he planted germinate, he asks you to suggest why. Which is the best explanation of what occurred?
A. The monocot seeds he used were only able to produce a single cotyledon each.
B. The seeds were planted too deeply and used up their reserves before reaching the surface and sunlight.
C. The suspensor failed to develop into an embryo within each seed.
D. All seeds require fire in order to germinate.
E. Seeds take more than one season to germinate.
B. The seeds were planted too deeply and used up their reserves before reaching the surface and sunlight.
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Choose the correct statement concerning blood vessels.
a. Venules control blood flow through capillaries. b. Arterioles drain blood from capillaries. c. Veins have thinner walls, but more valves than arteries. d. Nutrient exchange may occur along arterial vessels. e. All of the choices are correct.
Were guppies present in every pond?
a. yes b. no
Which of the following hormones may take part in one or more of these functions: daily rhythms, long periods of sleep, and depression?
A) melatonin B) thymosin C) oxytocin D) growth
Which of the following is known to reduce nitrates to nitrites?
A. Calcium B. Zinc C. Potassium D. Iron