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प्रश्न
Thallophyta, bryophyta and pteridophyta are called as ‘Cryptogams’. Gymnosperms and Angiosperms are called as ‘phanerogams’. Discuss why? Draw one example of Gymnosperm.
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उत्तर
Thallophyta, Bryophyta ‘and Pterido¬phyta are called “cryptogams”(Kntyptos-hidden, gamos-to marry) as all these are seedless plants and have inconspicuous reproductive organs.
Gymnosperms and Angiosperms are collectively called “phanerogams” (Phaneros-visible, gamos-to marry) as both the groups have seeded plants and conspicuous reproductive organs.
Fig. A: Female Cycas plant
B: Male Cycas plant
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संबंधित प्रश्न
Brown algae belongs to ______ class.
Pinus is a closed seeded plant.
Match the following.
| Cyanophyceae | Green algae |
| Chlorophyceae | Blue-green algae |
| Phaeophyceae | Red algae |
| Rhodophyceae | Brown algae |
Write any three economic importance of algae.
Assertion (A): Blue green algae are prokaryotes.
Reason (R): They do not have a true nucleus.
______ is a blue-green algae.
Polvsiohonia is a ______ alga.
______ is an example of symbiosis between algae & fungi.
The cell wall of algae is made up of a chemical substance called chitin.
Mention two salient features of algae.
