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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

(i) Manganese (ii) Copper (iii) Zinc


1. Manganese (Mn) :

Physiological role.
i.  As a Cofactor : Mangenese primarily functions as activator of several enzymes involved in photosynthesis. 

ii.  It helps in the splitting of water and liberation of oxygen 

iii. Synthesis of chlorophyll : It is also involved in the synthesis of chlorophyll.

Deficiency symptoms

Deficiency of manganese causes chlorosis, nacrosis in the interveinal areas of leaves, the veins remain green, the chloroplasts are devoid of chlorophyll and starch grains become yellow green in colour, vacuolated and finally disintegrate.

2. Copper :

Physiological role.

Copper is a component of many enzymes involved in redox reactions. It plays a as a key role in the electron transport chain in photosynthesis. 

Deficiency symptoms.

i. Deficiency of copper causes necrosis.

ii. Under severe conditions the whole plant may appear wilted and the leaves may be lost.

3. Zinc :

Physiological functions.
Zinc plays an important role in the activation of many enzymes especially carboxylases

It is involved in the synthesis of auxin. s

Deficiency symptoms.
Deficiency of zinc causes

(i) shortening of internodes with the result plant become stunted;

(ii) reduction in the size of leaves so that the leaves become very small.

(iii) chlorosis of older leaves starting at tip and extending to the margins.


Name the best known symbiotic nitrogen fixing bacterium.


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

Which pigment is present in the root nodules of legumes ?