Addition of a trace of thyroxine or iodine in water containing tadpoles will
Correct answer: B. Hasten their metamorphosis
- A. keep them in larval stage
- B. Hasten their metamorphosis
- C. Slow down their metamorphosis
- D. kill the tadpoles
Explanation
In 1912, Gudernatsch discovered that metamorphosis in a frog's tadpole is increased by the thyroxine hormone which has iodine as the main constituent. If thyroxine or iodine is added to water having tadpoles in it, then it increases the rate of metamorphosis in the tadpole.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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