Question

Localized death of tissue usually characterized by browning and desiccation is termed as _________.

• A. Chlorosis
• B. Necrosis
• C. Cracking
• D. Burning

Hint:

Pathological Terminology:
- Chlorosis: Loss of green pigment (yellowing); tissue is still living.
- Necrosis: Death of tissue resulting in brown, dry, dead spots/areas.
- Etiolation: Yellowing and elongation caused by lack of light.

Answer 1

The Correct Option is B

Concept:
Plant pathology and crop physiological disorders are identified by specific macroscopic symptoms caused by cellular damage, pathogen infection, or mineral deficiencies.
When plant cells lose membrane integrity and undergo irreversible death, localized morphological changes occur in leaves, stems, or fruits.
Differentiating between chlorophyll degradation and actual tissue death is essential for accurate field diagnosis.

Step 1: Defining Key Pathological Symptoms:
- Necrosis: The localized death of plant cells or tissues, typically accompanied by browning, darkening, drying out (desiccation), and collapse of the cellular matrix.
Examples include leaf spots, blights, cankers, and blossom-end rot.
- Chlorosis: The yellowing of green plant tissue caused by the degradation or insufficient synthesis of chlorophyll pigments; the cells remain alive but lack green color.
- Cracking: Physical splitting or rupturing of fruit peel or stem surfaces caused by rapid fluctuations in turgor pressure or boron/calcium deficiency.
- Burning: A broad descriptive symptom usually resulting from high chemical toxicity, fertilizer burn, or intense heat.

Step 2: Evaluating the Given Description:
The prompt specifies "localized death of tissue usually characterized by browning and desiccation."
This matches the formal pathological definition of Necrosis.

Step 3: Final Answer:
Thus, the correct terminology is Necrosis, which corresponds to option (B).