Question

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

• A. Too much shade
• B. Lack of nitrogen-fixing Rhizobium bacteria
• C. A deficiency in a mobile mineral nutrient.
• D. A deficiency in a non-mobile mineral nutrient.

Answer 1

The correct option is D A deficiency in a non-mobile mineral nutrient.

If there is a deficiency of mobile nutrients, the symptoms are first seen in the leaves. Mobile and immobile nutrients refer to the transportability of these (K), (Mg), (Cl), (Zn) and (Mo).

So, the correct option is 'A deficiency in a non-mobile mineral nutrient'.