JA and R.P.C.Johnson

question 38

Multiple Choice

J.A.Milburn and R.P.C.Johnson developed an acoustic method for detecting cavitation in plants.This involves "listening" for characteristic clicks produced during air-bubble formation,using sensitive microphones and amplifiers.In one experiment with the castor bean plant (Ricinus communis) ,they detached leaves by cutting the petioles and subjected them to various treatments.Which of the following would be least likely to be observed in such an experiment?

• A)as the leaf is allowed to wilt,recording many clicks that approximately equal the estimated number of vessels in the cut petiole
• B)after increasing transpiration by blowing warm air across the leaf,recording an increased rate of clicking
• C)after adding water to the cut end of the petiole,recording an increased rate of clicking

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Definitions:

Enamel

The hard, outermost layer of a tooth that protects it from decay.

Liver

A vital organ in the body responsible for processing nutrients from food, detoxifying harmful substances, and producing bile for digestion.

Amino Acids

Organic compounds that combine to form proteins, serving as the building blocks of life, containing both amino and carboxyl functional groups.

Esophagus

Muscular tube for moving swallowed food from the pharynx to the stomach.