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Question

You observe that a plant’s younger leaves, not the older ones, are yellowing. You recall that the cause of plant sickness can be diagnosed by leaves which are yellowing. What is the most likely cause of your plant’s blight?


A

Too much shade

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B

Lack of nitrogen-fixing Rhizobium bacteria

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C

Deficiency of a mobile mineral nutrient

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D

Deficiency of a non-mobile mineral nutrient

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Solution

The correct option is D

Deficiency of a non-mobile mineral nutrient


A deficiency in a non-mobile mineral nutrient causes yellowing of the plant’s younger leaves, not the older ones.

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