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A plant exhibits the appearance of brown...

A plant exhibits the appearance of brown spots surrounding by chlorotic veins. When inspected in more detail , it is observed that its calcium translocation to the shoot is also disrupted. The plant is showing toxicity of

A

Mn

B

Mg

C

Fe

D

Ca

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To solve the question regarding the plant exhibiting brown spots surrounded by chlorotic veins and disrupted calcium translocation, we can follow these steps: ### Step 1: Identify the Symptoms The plant shows: - Brown spots surrounding chlorotic veins. - Disruption in calcium translocation to the shoot. ### Step 2: Analyze the Symptoms - **Brown spots**: These can indicate a deficiency or toxicity of certain nutrients. In plants, such symptoms are often linked to nutrient imbalances. - **Chlorotic veins**: This suggests a lack of chlorophyll or issues with nutrient transport, particularly related to micronutrients. ### Step 3: Consider Nutrient Roles We need to consider the roles of various nutrients: - **Manganese**: A micronutrient that plays a crucial role in photosynthesis and helps in the translocation of calcium. - **Magnesium**: Important for chlorophyll production but does not directly affect calcium translocation. - **Iron (Ferrous)**: Essential for metabolic processes but not directly related to calcium transport. - **Calcium**: Vital for structural roles in the plant but not a direct factor in the observed symptoms. ### Step 4: Connect Symptoms to Nutrient Deficiency/Toxicity Given that manganese is essential for the proper translocation of calcium and the symptoms observed (brown spots and chlorotic veins) align with manganese deficiency, we can conclude that: - The brown spots and chlorotic veins are indicative of manganese toxicity or deficiency, which disrupts calcium translocation. ### Conclusion The plant is showing toxicity of **Manganese**. ---
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The appearance of brown spots surrounded by chlorotic veins is the prominent symptom of:-

Toxicicity of manganese in aplant result in a. Brown spot surrounded by chlorotic venis, b. Increases in uptake of Fe, c. Inhabition of Ca translocation in shoot apex

Assertion: The prominent symptom of manganese toxicity is the appearance of brown spots surrounded by chlorotic veins. Reason: Excess of maganese may induce deficiencies of iron, magnesium and calcium.

A : Maganese toxicity cause brown spots ,chlorotic veins and inhibintion of calcium translocation to shoot apex. R : Toxic effects may be due to direct excess of micronutrients or its interference in the absorbtion and functioning of other nutrients.

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