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Class 10 Class 12

Define the followings :
(1) Nutrients (2) Micronutrients

(3) Macronutrients (4) Active absorption

(5) Passive absorption

6) Symplastic pathway

(1) Nutrients. The chemical substance that works as a raw material for body building and maintaining its function is termed nutrient.

(2) Micronutrients. These are needed in very small amounts, equal to or less than 0. lmg per gram of dry matter.

(3) Macronutrients. These must be present in plant tissues in concentrations of 1 to 10 mg per gram of dry matter.

(4) Active absorption. It is the movement of ions or molecules against concentration gradient or towards concentration gradient by taking energy directly or indirectly through metabolism.

(5) Passive absorption. It is the movement of minerals from higher concentration to lower concentration by physical processes not involving direct expenditure of energy.

(6) Symplastic pathway. It is the movement of ions across the cytoplasm of cortex, endodermis of pericycle through plasmodesmata.

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

Anaerobic.
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Which pigment is present in the root nodules of legumes ?

Leghaemoglobin.
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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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