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9 March, 17:32

All plants require nitrogen in forms they can absorb through their roots, and that accessible nitrogen is provided by certain soil bacteria. while many plants rely on the activity of free-living soil bacteria for ammonium ions (nh4+) and nitrate ions (no3-), some plants form extremely close symbiotic relationships with nitrogen-fixing bacteria. for example, rhizobium bacteria (one type of nitrogen-fixing bacteria) take up residence inside the root cells of legume plants, which include peas, soybeans, and clover. in this activity, you will indicate how the legumes and the rhizobium bacteria are affected by this symbiosis.

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  1. 9 March, 17:45
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    Legumes and Rhizobium bacteria have evolved a mutual relationship in which both species benefit. The Rhizobium bacteria gain carbohydrates and protection from the plant whose roots they inhabit. Though some nitrogen-fixing bacteria can fix nitrogen in their free state, Rhizobium bacteria cannot fix nitrogen unless they are living inside a legume's roots. Therefore, both the plant and the bacteria gain fixed nitrogen from the relationship.
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