Stunted growth and small yellow leaves in plants are symptoms of the deficiencies of
nitrogen
iron
sulphur
magnesium
Explanation
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The correct answer is A. nitrogen.
Here's a breakdown of why:
* Nitrogen (N) is a critical component of chlorophyll, the molecule that gives plants their green color and is essential for photosynthesis. It is also a key part of amino acids, which are the building blocks of proteins, enzymes, and DNA.
* Symptoms of Nitrogen Deficiency:
* Stunted growth: Without enough nitrogen to produce proteins and nucleic acids, the plant's overall growth is severely limited.
* Yellowing leaves (chlorosis): This is the most classic symptom. Since nitrogen is a mobile nutrient, the plant will move it from older leaves to younger, more vital leaves. This causes the older, lower leaves to turn a pale green or yellow first. As the deficiency worsens, the yellowing will spread to the younger foliage.
* Small leaves: The leaves that do grow will be smaller than normal.
While other nutrients can cause yellowing (chlorosis), the combination of stunted growth and general yellowing of the older leaves first is the hallmark symptom of nitrogen deficiency.
Let's quickly look at the other options for comparison:
* B. Iron (Fe): Iron deficiency also causes chlorosis, but it typically affects the youngest leaves first, with the veins remaining green while the area between them turns yellow (interveinal chlorosis).
* C. Sulphur (S): Sulphur deficiency can look similar to nitrogen deficiency (stunted growth and yellowing), but the yellowing often appears on the youngest leaves first because sulphur is less mobile in the plant.
* D. Magnesium (Mg): Magnesium deficiency causes interveinal chlorosis (yellowing between the veins) that usually starts on the older leaves. However, the veins remain distinctly green, creating a prominent "Christmas tree" pattern.
nitrogen is the answer. reg modern biology; NUTURTION under macro and micro nutrient
The correct answer is: 
A. Nitrogen
Explanation:
• Nitrogen deficiency causes stunted growth because nitrogen is essential for making proteins and chlorophyll.
• It also leads to yellowing of leaves (chlorosis), especially the older leaves first, since nitrogen moves easily within the plant.
