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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Make a list of macronutrients and mention one major function of any four of them. 

The macronutrients are: carbon, hydrogen, oxygen, nitrogen, phosphorus, sulphur, potassium, calcium and magnesium.

Functions of carbon, hydrogen and oxygen :

These are the components of protoplasm and all organic componds found in plants.

Functions of nitrogen.

It plays a major constituent of proteins, nucleic acids, vitamins and hormones. 

Functions of phosphorous.

Phosphate plays a key role in energy metabolism. Incorporated into ATP it is part and parcel of the universal energy currency of all types of living systems.

Fuctions of sulphur.

Sulphur is present in amino-acids - cysteine and methionine. 


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 ?


Which pigment is present in the root nodules 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.