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प्रश्न
Write any three economic importance of algae.
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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
Binomial nomenclature was first introduced by _______
Brown algae belongs to ______ class.
Which among the following has specialised tissue for conduction of water?
- Thallophyta
- Bryophyta
- Pteridophyta
- Gymnosperms
Thallophyta, bryophyta and pteridophyta are called as ‘Cryptogams’. Gymnosperms and Angiosperms are called as ‘phanerogams’. Discuss why? Draw one example of Gymnosperm.
Assertion (A): Blue green algae are prokaryotes.
Reason (R): They do not have a true nucleus.
Blue-green algae are not placed under kingdom Protista whereas other algae are placed under it.
Polvsiohonia is a ______ alga.
Classification of algae was given by ______.
______ is an example of symbiosis between algae & fungi.
The cell wall of algae is made up of a chemical substance called chitin.
