Soil level
7. Observe the figure given alongside and answer the questions that follow:
a. Which special structures are shown in the figure?
b. Name the organism present inside these structures.
What is the role of these organisms?
d. What is the type of association between the root and these organisms called?
In what way is this association beneficial to the crops?
f. Name any two plants which bear this type of root.
C.
e.
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a) Root nodules in plant
b) nitrogen-fixing bacteria called rhizobia
c) The rhizobia create ammonia from nitrogen in the air, which is used by the plant to create amino acids and nucleotides. The plant provides the bacteria with sugars.
d) Symbiotic association between the root and these nitrogen-fixing bacteria.
e) Rhizobia provide ammonia for the formation of amino acids in plants.
f) They can be seen in Faboideae legumes such as Pisum (pea), Medicago (alfalfa).
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