Question

Arrange the following steps of root nodule formation in correct order :
A. Formation of bacteroids and differentiation into nitrogen fixing symbiosomes
B. Attachment of bacterial cells to root hairs
C. Plant root hair with attached Rhizobium undergoes curling
D. Bacterial penetration into root hair cell and cell to cell spread of rhizobia
E. Plant root releases flavonoids
Choose the correct answer from the options given below :

• A. \(C, D, E, B, A\)
• B. \(C, A, D, B, E\)
• C. \(E, B, C, D, A\)
• D. \(B, D, A, C, E\)

Hint:

Remember the sequence: \[ \text{Flavonoids} \rightarrow \text{Attachment} \rightarrow \text{Root hair curling} \rightarrow \text{Infection thread} \rightarrow \text{Bacteroids} \]
• Rhizobium fixes atmospheric nitrogen in legume root nodules.
• Nitrogenase enzyme carries out nitrogen fixation.

Answer 1

The Correct Option is C