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Nodule Formation

Identify the ...

Question

Identify the correct option related to the given figure regarding root nodule formation in legumes.

A

A-Infection thread containing bacteria

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B

B-Inner Cortex and pericycle cells under division

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C

Both A & B

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D

B - Mature nodule

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Solution

The correct option is B
B-Inner Cortex and pericycle cells under division

Rhizobia infects the root hair and forms infection thread. It causes inner cortical cells and pericycle cells to divide rapidly.

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Similar questions

Q. Mark the correct sequence of steps for the development of root nodules in legumes
A. Formation of infection thread.
B. Division of cortical and pericyclic cells.
C. Curling of root hairs.
D. Leghaemoglobin synthesis.

Q. Consider the following steps involved in nodule formation in the root of a legume.
(i) Bacteria release chemicals and enzymes.
(ii) Bacteria stop dividing and form baceroides.
(iii) Roots secrete chemical attractants.
(iv) Formation of infection thread.
(v) Formation of nodules.
(vi) Division of infected cortical cells.
(vii) Curling of root hair and degradation of their cell wall.
(viii) infection thread grows along with multiplication of bacteria.
Arrange the steps in the right sequence and mark the correct option.

The correct sequence of events related to nodule formation of legumes is

A. Formation of bacteroids

B. Growth of infection thread

C. Secretion of sugars, amino acids and flavonoids by roots

D. Chemotactic movement of Rhizobia towards legume roots

Q.
Read the following statements and mark them as True (T) or False (F).

(a) Plants can assimilate ammonium ions only
(c) Rhizobium is an obligation anaerobe
(c) In legumes, the nodule is formed by the inner cortex and pericycle cells.

The correct sequence of events related to nodule formation of legumes is

A. Formation of bacteroids

B. Growth of infection thread

C. Secretion of sugars, amino acids and flavonoids by roots

D. Chemotactic movement of Rhizobia towards legume roots

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