However, many hydrophytes have well developed root systems. For example, Eichhornia and Pistia have well developed adventitious roots. In these. A level OCR Biology on plant adaptations to water availability. Examines the adaptations made by hydrophytes and their importance.

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In free floating plants like hydrophyte the petiole is swollen and helps in floating.

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Classification of plants based on water relation Warming, More light intensity in the aerial parts favours formation of entire leaves Fig. Download ppt “Xerophytes and Hydrophytes”. Some adaptwtions and arthropods of hyper-arid deserts possess raised thermal tolerance and extremely low metabolic rate. In floating plants like Pistia, in place of root caps, root pockets are found.

Morphological and Physiological Adaptations of Hydrophytes

Puddles the Monkey Forum: To adpatations the low oxygen capacity to its blood, ice fish has relatively large gills, vascular skin for respiration and large heart with exceptionally high cardiac output and very little red aerobic myotomal musculature to reduce oxygen demand. The nitrate respiration enables the bacteria to function in an environment which is very low in oxygen Willmer et al, The organisms, especially prokaryotes, which occur in deep-sea thermal vents, are extremophiles having highly specialized enzymes.


It is possible that hydrophytes developed concurrently with land plants. The soil is sandy, stony and salty. Certain locomotory tricks as in sidewinder snakes and dune spider are adopted to minimize body contact with the surface Pough et al, ; Henschel, The inner surface is covered in hairs.

In the deepest seas organisms live in pitch dark, under high pressure and low temperature. Their sulphide-binding hydrophytess play an important role by drawing free sulphide into general circulation.

Some other adaptations of deep-sea animals are chemoreception, bioluminescence, electroreception, and echolocation. These bacteria can probably use nitrate in addition to oxygen, producing ammonia and nitrate as end products. Edexcel Biology AS Level, but also other exam boards.

Desert adaptations have already been discussed. The rolled leaf and hairs both serve to trap moist air so reducing transpiration.

This is the registered address, please do not use for communication. Stem and Lenticel Hypertrophy: As a result, the xylem tubes is often greatly reduced, if not absent.

It hydrophyhes the smallest genome so far known in non-parasitic bacteria.

Xerophytes and Hydrophytes – ppt video online download

Conditions Affecting the Organisms in Natural Ecosystems. Factors affecting plants in the aquatic environment. An example of a mesophytic habitat would be a rural temperate meadow, which might contain Goldenrod, Clover, Oxeye Daisy, and Rosa multiflora. There is some complicated chemistry involved with the carbon dioxide, pH, and carbonate hardness of the water that affects the environment these plants are in.


The green pigment-containing chloroplasts important for photosynthesis are restricted to the upper surface of the leaves which are the only surface to be well lit.

Stomata may be sunk in pits in the epidermis; moist air trapped here lengthens the diffusion pathway and reduces evaporation rate. Aquatic plants are plants that have adapted to living within adaptatiobs environments.

– Adaptation of Hydrophytes | Hydrophytes

The emergent leaves are usually much less divided, if not entire and have a more similar internal structure to those of land plants. Recently Saha and Datta Munshiand Saha have described limnology of some thermal springs of Bihar.

The leaves of free floating hydrophytes are smooth and shining and coated with wax.