August 29, 2015


Seaweeds are (thalloid plants) macroscopic algae, which mean they have no differentiation of true tissues such as roots, stems and leaves. They have leaf-like appendages. Seaweeds, the larger and visible marine plants are found attached to rocks, corals and other submerged strata in the inter-tidal and shallow sub tidal zones of the sea. Seaweeds grow in shallow coastal waters wherever sizable substata is available. Based on the colour of their pigmentation, sea weeds are broadly classified into different classes such as
• blue-green,
• green,
• brown,
• red etc.
Functions of seaweeds

• Food for marine organism
• Habitat for fish breeding grounds,
• Source of sediment.

Uses of seaweeds
1. Seaweeds are important as food for humans, feed for animals, and fertilizer for plants.
2. Seaweeds are used as a drug for goiter treatment, intestinal and stomach disorders.
3. Products like agar-agar and alginates, iodine which are of commercial value, are extracted from seaweeds.
4. By the bio-degradation of seaweeds methane like, economically important gases can be produced in large quantities.
5. Extracts of some seaweed species show antibacterial activity.
6. Seaweeds are also used as the potential indicators of pollution -in coastal ecosystem, particularly heavy metal pollution due to their ability to bind and accumulate metals strongly.

Harmful effects of seaweeds
1. Rotting seaweed is a potent source of hydrogen sulfide, a highly toxic gas, and has been implicated in some incidents of apparent hydrogen-sulphide poisoning. It can cause vomiting and diarrhoea.
2. Threats to seaweeds
3. Threat are similar to that of sea grass.


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