ï»¿ Name at least five different deficiency symptoms in plants. Describe them and correlate them with concerned mineral deficiency. from Biology Mineral Nutrition Class 11 Assam Board

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Name at least five different deficiency symptoms in plants. Describe them and correlate them with concerned mineral deficiency.

1. Chlorosis : It is the yellowing of leaves due to the loss of chlorophyll. It is due to the deficiency of Mn, N, K, Mg, S, Fe, Zn, and Mo.

2. Die back: It is the withering of stem from apex downward. It is due to the deficiency of copper.

3. Necrosis : It is the death of the tissues.  The leaf tips develop dead areas or necrotic areas. It may be also due to Ca, Mg, Ni, Cu and K.

4. Whiptail disease : It occurs in cauliflower. It is due to the deficiency of Mo.

5. Little leaf disease: It is due to the deficiency of Zn. It also causes rosette of apple and peaches.

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What type of condition is created by leghaemoglobin in the root modules of legumes ?

Anaerobic.
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How is nitrogenase enzyme protected ?

The nitrogenase enzyme is very sensitive to the molecular oxygen. It requires anaerobic conditions to work. The leg-haemoglobin in the nodule acts as an oxygen scavenger just meainting the anaerobic condition needed by the enzyme.
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Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.
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What is Hidden hunger in the case of plants?

Hidden hunger refers to a situation in which a crop needs more of a given nutrient yet has shown no deficiency symptoms. The nutrient content is above the deficiency symptom zone but still considerably needed for optimum crop production
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Which pigment is present in the root nodules of legumes ?

Leghaemoglobin.
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