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4. You learned in your plant physiology class that stomatal aperture is regulated by an integration of signals from biotic and abiotic stimuli. You see that your well-watered plant has leaves that are wilted on one, but not on the other side of the plant. What do you think is going on (your hypothesis)? How would you test it (experiment

Explanation / Answer

A well- watered plant sometimes has leaves which are wilted on one side. The more probable cause for such a condition is the root rot disease in plant caused by fungi. Verticillium wilt is one such disease.

The symptoms can be observed in the form of stunted growth and yellowish colour of the plant.

Experimentally, the infected tissue can be stained with 1% phloxine solution to test for biochemical and physiological changes.

The seeds can be tested electron microscopically to detect viral infection.

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