Rickets is caused by
a. overexposure to UV radiation.
b. an excess of calcitonin.
c. inadequate amounts of vitamin D.
d. an excess of ascorbic acid.
e. a fetal deficiency of thyroid hormone.
Answer: c
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Plants and algae contain this organelle not found in heterotrophs:
a. nucleus. b. mitochondria. c. chloroplasts. d. flagella.
Under which condition will a population experience growth?
A. when N equals K B. when N is less than K C. when dN/dt equals zero D. when r equals zero E. when N equals zero
The number of European rabbits in Australia is
currently controlled by a. two viruses. b. a 2,000-mile-long fence. c. pesticide application to grasslands. d. toxic species of grasses. e. fumigation and destruction of their burrows.
Which of the following statements about abscisic acid are true? (Check all that apply.)A) It is produced chiefly in mature green leaves and in fruits.B) It stimulates the growth of dormant buds.C) It promotes leaf senescence.D) It plays an important role in controlling the opening and closing of stomata.E) It plays a role in seed dormancy.
What will be an ideal response?