The most common and physiologically important auxin is:
a. indoleacetic acid.
b. indolebutyric acid.
c. naphthaleneacetic acid.
d. 2,4-D.
e. 2,4,5-T.
A
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What makes a mineral element essential for plant growth?
A. It can only be found in organic fertilizers. B. It is part of typical chemical fertilizers. C. As its concentration increases, the plant grows more. D. If it is missing, the plant cannot grow or reproduce normally. E. It contributes to the solute potential of the plant.
Hover flies like to drop in at outdoor picnics to
sample the sweets, but the reaction of the humans is to flee the scene because of the flies’ uncanny resemblance to bees. Thus, the survival of the hover fly is enhanced by a. mimicry. b. display behavior. c. warning coloration. d. chemical defenses. e. camouflage.
Carbon dioxide and water can combine to form glucose, water and oxygen. What is required for that process to occur?
A. Energy from the process of cellular respiration B. Light energy from the sun C. Mitochondria D. Nothing, this is a spontaneous reaction
Life forms exhibit both unity and diversity. Which of the following best demonstrates the unity among all organisms?
A. The three domains of life. B. Emergent properties. C. Amino acids are the building blocks of proteins. D. Natural selection.