Biology
Grade-10
Easy
Question
Select the symbiotic nitrogen fixing microorganism among the following.
- Rhizobium
- Clostridium
- Azospirillum
- Nitrococcus
Hint:
Rhizobium is a symbiotic nitrogen-fixing bacteria.
The correct answer is: Rhizobium
- The symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they multiply and stimulate the formation of root nodules, enlargements of plant cells, and bacteria in intimate association.
- Within the nodules, the bacteria convert free nitrogen to ammonia, which the host plant utilizes for its development.
- The most familiar example of symbiotic nitrogen fixation is the close association between legumes and rhizobial bacteria (Rhizobium, Mesorhizobium, Sinorhizobium, and Bradyrhizobium) although associative and free-living diazotrophs are potentially important in several monocot crops.
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