NEET Biology question

BiologyMineral NutritionNEET

Not in NEET syllabus

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 bacteroids. (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.

Answer: (A)

Solution

Legume roots first secrete chemical attractants (iii), to which bacteria respond by releasing their own chemicals/enzymes (i), causing curling of the root hair and degradation of its cell wall (vii), leading to formation of an infection thread (iv) that

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Question ID VK-113048