Biology · Morphology of Flowering Plants · NEET
Pneumatophores are ROOTS, not stems. They are a type of modified root. In mangroves the underground roots send branches that grow straight up out of the mud. Because they are roots, they have no nodes, no internodes and no buds. NEET often mixes root and stem modifications in one question, so remember: pneumatophore = respiratory ROOT.
Mangroves grow in salty, waterlogged marshy soil. This soil has almost no oxygen because water fills all the air spaces. The normal underground roots cannot get oxygen to breathe. So the plant grows special roots upward, above the water, to take oxygen from the air. These breathing roots are called pneumatophores.
Pneumatophores are NEGATIVELY geotropic. Normal roots grow downward, toward gravity (positively geotropic). But pneumatophores grow UP, away from gravity, so they are negatively geotropic. This upward growth lets them reach the air above the water. NEET has tested this exact point.
They are HALOPHYTES. Halophytes are plants that grow in salty soil, and mangroves live in saline marshy coasts. NEET 2018 asked exactly this: the answer is halophytes, NOT hydrophytes. A hydrophyte lives in fresh water; a mangrove lives in salty, oxygen-poor coastal mud.
Yes. Rhizophora is the classic NCERT mangrove example that shows pneumatophores. When you see Rhizophora in a NEET question, link it to vertical respiratory roots that grow up to get oxygen. Avicennia is another common mangrove example.
No. Pneumatophores are only for RESPIRATION (breathing in oxygen). They do not store food and they do not do photosynthesis. Do not mix them with prop roots (support) or storage roots like carrot. Their one job is to bring air to the underground root system.
Pneumatophores occur in
Identify the correct set of statements: (a) The leaflets are modified into pointed hard thorns in Citrus and Bougainvillea (b) Axillary buds form slender and spirally coiled tendrils in cucumber and pumpkin (c) Stem is flattened and fleshy in Opuntia and modified to perform the function of leaves (d) Rhizophora shows vertically upward growing roots that help to get oxygen for respiration (e) Subaerially growing stems in grasses and strawberry help in vegetative propagation.
Try the real previous-year questions from this chapter — each with the answer and a full solution.
Pneumatophores are modified respiratory roots that grow vertically upward out of the water in mangroves to take in oxygen for the underground roots.
Rhizophora, a mangrove, is the standard NCERT and NEET example. Avicennia is another accepted mangrove example.
NCERT lists three root modifications: storage (carrot, turnip), mechanical support (prop roots, stilt roots) and respiration (pneumatophores). Pneumatophores are the respiration type.
No. Prop roots give mechanical support (like in the banyan tree) while pneumatophores are only for breathing. Both are adventitious roots, but their functions are different.
The marshy salty soil is waterlogged, so water fills the air spaces and there is almost no oxygen. Normal underground roots cannot get oxygen, so pneumatophores grow up to the air instead.
