Question

Explain
1 mycorrhiza
2 cyanobacteria
3 rhizobium

Answer 1

Answer:

1. Mycorrhiza : The fungal symbionts in these association absotb phosphorus from the soil and transmit it the plant. The plants also show resistance to root borne pathogens, tolerance to salinity and droughts and an overall increase in plant growth and development.
2. Cyanobacteria : Serves as an important biofertilisers by fixing atmospheric nitrogen. They also add organuc matter to the soil and increase its fertility.
3. Rhizobium : They fix atmospheric nitrogen into otganic forms which is used by plants as nutruents. They form a symbiotic association in root nodules of leguminious plants.

Answer 2

Explain

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Mycorrhiza -

Defination

Mycorrhiza is a mutual symbiotic association between a fungus and a plant.

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Importance -

• Mycorrhizal fungi form relationships with over 95% of plant species.
• They surround and even enter the roots of these plants, and provide nutrients

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Types of Mycorrhiza

There are two main types of mycorrhiza:

1. Ectomycorrhizae
2. Endomycorrhizae.

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Cyanobacteria

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Defination -

Cyanobacteria are aquatic and photosynthetic, that is, they live in the water, and can manufacture their own food.

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Importance

Cyanobacteria are important in the nitrogen cycle.

Cyanobacteria are very important organisms for the health and growth of many plants.

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Domain

Bacteria

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Rhizobium

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Definition

“Rhizobium is a soil bacteria that fixes atmospheric nitrogen once it finds a base inside the roots of the leguminous plants”.

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Classification

Rhizobium can be classified on the basis of the types of the plant they are associated with and also the rate of growth.

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Role of Rhizobium

Rhizobium plural form rhizobia are prokaryotes whose main function involves the conversion of stable nitrogen gas in the atmosphere to a biologically useful form. Nitrogenase is an enzyme complex that reduces dinitrogen to ammonia.

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