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Answers
Answer:
1) Rhizobia are Gram-negative soil bacteria that adhere to and colonize the root cells of leguminous plants, including soybeans and alfalfa. Upon entry into a root hair, rhizobia traverse a distance to the center of the root hair cell and together with proliferating plant cells form a nodule.
2) I don't know
3)Five precautions to be taken in laboratory are :
Do not touch or taste any unknown substance.
Use only small quantity of chemical to carry out experiment.
Do not work alone in the laboratory.
Do not throw hot concentrated acids into the sink directly.
Always wear an apron in the laboratory to protect your clothes.
While heating keep the mouth of test tube away from your eyes and face.
The apparatus to be used in an experiment should be arranged neatly before beginning an experiment.
Do not throw broken glass apparatus or used filter paper in the sink. Throw them in a dustbin.
4) Rhizobia are a "group of soil bacteria that infect the roots of legumes to form root nodules". Rhizobia are found in the soil and after infection, produce nodules in the legume where they fix nitrogen gas (N2) from the atmosphere turning it into a more readily useful form of nitrogen.
5) Rhizobium spp. are soil-dwelling α-Proteobacteria that can fix nitrogen in a symbiotic relationship with leguminous plants. Nodules develop on the roots of nitrogen-starved legumes such as peas, beans, clover, and soy.
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