Which of the following display negative geotropism ?

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Crown roots of Zea mays

Areal root of Ficus benghalensis

Fibrous root of Cynodon dactylon

Aerating roots of Sonneratia caseolaris

answer is B.

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Detailed Solution

Pneumatophores or respiratory roots are found in mangroove plants like Avicennia, Sonneratia and Rhizophora which grow in saline swamps. These roots come out of the water and grow vertically upwards (ageotropic roots) and pickup oxygen for respiration.

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