**Question:** Sulphur granules are composed of -

A. Sulphur
B. Hemoglobin
C. Pigments
D. Iron

**Core Concept:**
Sulphur granules are organelles present in certain eukaryotic cells, particularly in plants and fungi. They are involved in the detoxification of various toxic substances and play a role in the defense mechanism of these organisms.

**Why the Correct Answer is Right:**
Sulphur granules are composed of sulfur (S) in the form of thiocynate and other sulfur-containing compounds. These compounds are responsible for the detoxification of various toxic substances, such as heavy المعادن like cadmium, lead, and mercury. The sulfur compounds help in neutralizing these toxic substances and preventing their uptake by the cells.

**Why Each Wrong Option is Incorrect:**

A. Hemoglobin: Hemoglobin is a protein found in red blood cells, responsible for carrying oxygen. It is not related to sulphur granules or their composition.

B. Pigments: While some pigments may be associated with cells or tissues, this option is too broad and not specific to sulphur granules.

C. Iron: Iron is an essential element for various biological processes, but it is not the composition of sulphur granules.

D. Iron: Similar to option C, iron is an essential element for various biological processes but not related to the composition of sulphur granules.

**Clinical Pearl:**
Understanding the composition and function of sulphur granules is crucial for understanding the defense mechanism of plants and fungi against toxic substances. This knowledge is essential for students studying biology, biochemistry, and pharmacology, as well as medical students preparing for clinical exams.

**Correct Answer:** Sulfur (A)

Sulfur granules are composed of sulfur compounds, specifically thiocyanate and other sulfur-containing molecules, which play a crucial role in detoxifying heavy-metal-induced toxicity in plants and fungi. This understanding is essential for students studying botany, zoology, pharmacology, and medical students preparing for clinical exams.