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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
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.


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.

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


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

Name the best known symbiotic nitrogen fixing bacterium.


Which pigment is present in the root nodules of legumes ?