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Question
Characteristic feature of halophytes are
Characteristic feature of halophytes are
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Solution
The correct option is D Both B and C
The soil in coastal region is poorly aerated and it contains very small percentage of oxygen, because of waterlogging. Under such conditions, the roots of halophytes do not get sufficient aeration. In order to compensate this lack of soil aeration, the hydro-halophytes develop special type of negatively geotropic roots, called as pneumatophores or breathing roots. The pneumatophores usually develop from the underground roots and project in the air well above the surface of mud and water. They appear as peg-like structures. The tips of these respiratory roots may be pointed. They possess numerous lenticels or pneumathodes on their surface and prominent aerenchyma enclosing large air cavities internally. The gaseous exchange takes place in these roots through the lenticels.
The soil in coastal region is poorly aerated and it contains very small percentage of oxygen, because of waterlogging. Under such conditions, the roots of halophytes do not get sufficient aeration. In order to compensate this lack of soil aeration, the hydro-halophytes develop special type of negatively geotropic roots, called as pneumatophores or breathing roots. The pneumatophores usually develop from the underground roots and project in the air well above the surface of mud and water. They appear as peg-like structures. The tips of these respiratory roots may be pointed. They possess numerous lenticels or pneumathodes on their surface and prominent aerenchyma enclosing large air cavities internally. The gaseous exchange takes place in these roots through the lenticels.
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