This nutrient moves from old leaves to new leaves Deficiency of which of the following nutrients cau...........

Agriculture and Rural Development (Phase-I/II) Agriculture chemistry

This nutrient moves from old leaves to new leaves. Deficiency of which of the following nutrients causes purple spots on the leaves that eventually turn brown, orange or yellow?

This questions was previously asked in

Nabard grade-A,Previous year Memory Based Paper (2022)

View All NABARD Previous Year Papers

Nitrogen

Potassium

Phosphorus

Calcium

Magnesium

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Explanation:

Let’s break it down by each nutrient:

- Nitrogen: It’s mobile in plants. Deficiency shows up as yellowing of older leaves, not really with purple spots.

- Potassium: Also moves from old to new tissue. Lacking potassium causes leaf edge browning and curling—not purple spots.

- Phosphorus : This one is key. When plants don’t get enough phosphorus, you see purple spots on older leaves. Over time, those spots can turn brown, orange, or yellow as damage gets worse.

- Calcium: It’s not mobile—deficiency shows up in new leaves as stunted growth or blossom end rot.

- Magnesium: Mobile, sure, but when it’s missing you get yellowing between leaf veins (interveinal chlorosis), not usually purple spots.

So, the right answer is: Option 3 – Phosphorus