The given diagram shows the development of root nodule in soyabean. Thus structures are marked as A, B, C and D.
Identify the correct labelling of A, B, C & D.

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A-Rhizobial bacteria; B-Cortex cell; C-Outer cortex; D-Infection thread containing virus.

A-Rhizobial bacteria; B-Cortex cell; C-Inner cortex and pericycle cells; D-Infection thread containing bacteria

A-Rhizobial bacteria; B-Endodermal cell; C-Inner endodermis; D-Infection thread containing virus

A-Nitrosomonas bacteria; B-Cortex cell; C-Inner cortex and pericycle cells; D-Infection thread containing bacteria.

answer is B.

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Detailed Solution

Rhizobium bacteria infected the root hair and entry of bacteria causes an infection thread which carries the bacteria to the inner cortex where the bacteria get modified into rod shaped bacteria and cause inner cortical and pericycle cells to divide to form the nodule.

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