Plants takes up mineral nutrients in solution from the soil. Some of these are r...

Plants require various mineral nutrients from the soil in order to grow and develop properly. Some of these nutrients are needed in large quantities, while others are needed in smaller quantities. The question is asking which nutrient is required in small quantities.

The options provided are:

- Option A: Nitrogen

- Option B: Potassium

- Option C: Iron

- Option D: Sulphur (Correct)

- Option E: Calcium

To determine the correct answer, we need to understand the role of each nutrient in plant growth. Nitrogen is an essential nutrient used by plants to produce proteins and chlorophyll, which are important for photosynthesis and overall growth. Potassium is involved in various plant functions, including water regulation and nutrient uptake. Iron is necessary for the production of chlorophyll and is important for photosynthesis. Calcium is required for cell wall formation and overall plant structure.

Sulphur, on the other hand, is required in smaller quantities compared to the other nutrients listed. It plays a role in the formation of certain amino acids and proteins, but is not needed in large amounts for plant growth.

Therefore, the correct answer is Option D: Sulphur.

It's important to note that while all of these nutrients are essential for plant growth, they are needed in different quantities. Some nutrients, like nitrogen and potassium, are required in larger amounts, while others, like sulphur, are needed in smaller amounts.

Overall, understanding the role of different nutrients in plant growth is important for farmers and gardeners to ensure that plants receive the right balance of nutrients for healthy growth and productivity.