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they have got a root nodule
abnormal outgrowths of plant tissues and can be caused by nematodes is gall and nodule is formad by nitragen fixtion bacteria.
To obtain water for the pant from the ground/soilTo anchor the plant to the ground
The plant's roots anchor it to the ground and the root hairs absorb water and minerals.
Rosemary has a fibrous root system. This is because there are multiple roots that anchor it to the ground. Also there is no major root (taproot).
James Matthew Vincent has written: 'A manual for the practical study of the root-nodule bacteria' -- subject(s): Rhizobia
Roots anchor a plant in the ground, absorb water and minerals from the soil, and sometimes store food.
Nitrogen fixation occurs in leguminous plant that have nitrogen fixing bacteria in the root nodule. The plants utilize the nitrogen from the nitrogen fixing bacteria. The bacteria utilize plant sugars formed via photosynthesis.
Although moss does not have a true root system, it does have growths called rhizoids, which are root-like. These growths anchor moss to soil, or other surfaces. Moss draws moisture from the air.
Their job is to anchor the plant in the ground firmly and absord mineral nutrients from the soil around the plant.
Charles Hamilton McBurney has written: 'Pantothenic acid and the nodule bacteria, legume symbiosis' -- subject(s): Root-tubercles, Nicotinamide, Symbiosis
The tap root is the main anchor root, that is its purpose.