The modifications of tap root system are:
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Type
|
Description
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Examples
|
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1. Fleshy Tap roots(Four types)
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Modified for food storage
|
|
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a. Fusiform root
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Swollen in the middle, tapering towards both the ends
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Raphanus sativus (Radish)
|
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b. Conical root
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Broad towards the base and gradually tapers towards the apex.
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Daucus carota (Carrot)
|
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c. Napiform root
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Thickest at the base and takes spherical shape.
Suddenly thins out towards lower side
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Beta vulgaris (Beet root)
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d. Tuberous root
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No definite shape
|
Mirabilis jalapa (4 o’ clock plant)
|
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2. Nodulated roots
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Presence of nodules on branches.
Responsible for symbiosis and nitrogen fixation
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Arachis hypogeal (Groundnut)
|
|
3. Pneumatophores
OR
Breathing roots
|
Negatively geotropic
Bears small pores called lenticels on apical region for gaseous exchange
|
Mangroves like Avicennia
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