Question

Which of the following is an example of positive feedback?

A. Abscisic acid (ABA) in plants slows bud growth in cold temperatures.
B. An increase in ethylene gas causes fruits to ripen more quickly.
C. Taking a tranquilizer slows the speed of signal transmission in neurons.
D. Panting in dogs increases the amount of cool air in nasal passages and lowers body temperature

Answer 1

B. An increase in ethylene gas causes fruits to ripen more quickly.

Step-by-step explanation:

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Answer 2

The correct option is B.
Positive feedback refers to the amplification of an effect by its own influence on the process which give rise to it. Ethylene gas is a plant hormone which stimulates ripening. As the quantity of the ethylene gas that is released increases, the rate of ripening of the fruits also increases.