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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
Match the following.
| Cyanophyceae | Green algae |
| Chlorophyceae | Blue-green algae |
| Phaeophyceae | Red algae |
| Rhodophyceae | Brown algae |
Define - Thallus.
Write the differences between algae and fungi.
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.
______ is an edible algae.
Classification of algae was given by ______.
Minute algae floating on the surface of the water are called ______.
Agar-Agar is extracted from red algae.
Mention two salient features of algae.
