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प्रश्न
Write any three economic importance of algae.
उत्तर
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Agriculture: Some of the blue-green algae are essential for the fixing of atmospheric nitrogen into the soil, which increases the fertility of the soil, for example, Nostoc, Anabaena.
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Agar-Agar: Agar Agar is extracted from some red algae, namely Gelidium, Gracillaria, etc., which is used to prepare growth medium in laboratories.
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Iodine: Iodine is obtained from brown algae like Laminaria (kelp).
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संबंधित प्रश्न
Brown algae belongs to ______ class.
In polypetalae, the petals are free.
Pinus is a closed seeded plant.
Match the following.
| Cyanophyceae | Green algae |
| Chlorophyceae | Blue-green algae |
| Phaeophyceae | Red algae |
| Rhodophyceae | Brown algae |
Define - Thallus.
Thallophyta, bryophyta and pteridophyta are called as ‘Cryptogams’. Gymnosperms and Angiosperms are called as ‘phanerogams’. Discuss why? Draw one example of Gymnosperm.
Blue-green algae are not placed under kingdom Protista whereas other algae are placed under it.
Polvsiohonia is a ______ alga.
______ got from algae is used to prepare growth medium in laboratories.
Mention two salient features of algae.
