A) has Rhizobium
B) is fast growing and can form humus
C) has cyanobacteria
D) has mycorrhiza
Correct Answer: C
Solution :
Azolla an aquatic fem and smallest pteridophyte has cavities is the leaves, which are occupied by Anabaena azollae (cyanobacterium). The Anabaena is capable of nitrogen fixation. A part of nitrogen in excreted in the cavities and becomes available to fern. The decaying fern plant release the same for utilization of crop plants, therefore, act as biofertilizer. Rhizobium forms the nodules in the root of legumenous plants. They are capable of nitrogen fixation. Mycorrhiza is a symbiotic association between fungi and root of higher plants. In mycorrhiza the fungi work as substitute of root hair i.e., absorb water and minerals from the soil.
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