Home
Class 11
BIOLOGY
Consider the following steps involved in...

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 bacteroides.
(iii). Roots secrete chemical atractants.
(iv). Formation of infection thread.
(v). Formation of nodules.
(v). Formation of nodulues.
(vi). Division of infected cortical cells.
(vii) Curlinig 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

A

(iii).(i),(vii),(iv),(viii),(vi),(v),(ii)

B

(iii),(iv),(viii),(i),(vi),(vii),(ii),(v)

C

(i),(iv),(iii),(vi),(v),(vii),(viii),(ii)

D

(i),(iii),(vi),(iv),(viii),(ii),(v),(vii)

Text Solution

Verified by Experts

The correct Answer is:
A

Roots of a legume secrete chemical attractants. Bacteria collect over the root hair, release certain hormones and enzymes, which cause curling of root hair around bacteria degradation of cell wall and formation of an infection thread enclosing the bacteria. infection thread grows along with multiplication of bacteria. the inifected cortical cells of root divide and make direct connection with vascular tissues. it produces swellings called nodules. Infected cells enlarge. Bacteria stop dividing and form irregular polyhedral strutures called bacteroides.
Promotional Banner

Similar Questions

Explore conceptually related problems

First neuron involved in synapse formation

Second neuron involved in the synapse formation

What are the steps involved in formation of a root nodule?

The factors involved in the formation of new species are

______is involved in formation of chlorophyll.

Which one of the following is involved for the formation of rainbow in the sky?

Ester formation involves the reaction of

Which of the following hormones is used in root formation on stem cutting?

Bacteria cell wall is made up of