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Unformatted text preview: 42 Animal Hormones Multiple Choice 1. Which of the following is a local hormone? a. Adrenaline b. Estrogen c. Histamine d. Insulin e. Thyroxine Answer: c 2. The hormones of invertebrates a. are never secreted from glands in the head. b. are secreted only in adulthood. c. play no role in molting and metamorphosis. d. have different functions from those in vertebrates. e. require large quantities to have an effect. Answer: d 3. Which of Wigglesworths observations of Rhodnius bugs helped describe the role of insect hormones? a. A blood meal triggers molting in these bugs. b. If decapitated immediately following a blood meal, the bug will molt. c. When two bugs are connected, they molt simultaneously. d. When two bugs are connected, the feeding status of one can trigger molting in the other. e. When two bugs are decapitated and connected, they will never molt into adults. Answer: d 4. Insect brain hormone serves to a. stimulate the prothoracic gland to release the hormone that stimulates molting. b. stimulate the corpora cardiaca to release molting hormone. c. directly stimulate molting if food reserves are adequate. d. inhibit molting until the insect is a certain size. e. have a general inhibitory effect on insect growth. Answer: a 5. Which of the following hormones directly stimulates an insect larva to molt? a. Brain hormone b. Ecdysone c. Juvenile hormone d. Moltin e. Prolactin Answer: b 6. Juvenile hormone be used by humans as an effective control of insect populations because it causes a. juvenile insects to die. b. the insects to fail to molt. c. the insects to fail to develop into adults. d. even tiny insects to pupate. e. insects to molt too quickly. Answer: c 7. The neurohormones vasopressin (antidiuretic hormone) and oxytocin are produced by the a. anterior pituitary and released by the posterior pituitary. b. hypothalamus and released by the posterior pituitary. c. pituitary and signal to the hypothalamus. d. hypothalamus and signal to the brain. e. pituitary and signal to the reproductive organs. Answer: b 8. Which of the following is an effect of oxytocin? a. Stimulation of uterine contractions at birth b. Increased reabsorption of water in the kidney c. Stimulation of tropic hormone release d. Increased productivity of the hypothalamus e. Increased rate of ovulation in the ovary Answer: a 9. Which of these pairs correctly matches a pituitary hormone with its target organ? a. Oxytocinoviducts b. Melanocyte-stimulating hormonekidney c. Endorphinsbrain d. Growth hormoneskin and hair e. Luteinizing hormonethyroid Answer: c 10. The best source of pituitary hormones for medical uses today is a. slaughtered sheep or cattle. b. human cadavers....
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