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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
Floridian starch is a reserve food material of
Binomial nomenclature was first introduced by _______
Brown algae belongs to ______ class.
Assertion (A): Blue green algae are prokaryotes.
Reason (R): They do not have a true nucleus.
Polvsiohonia is a ______ alga.
Minute algae floating on the surface of the water are called ______.
______ got from algae is used to prepare growth medium in laboratories.
The cell wall of algae is made up of a chemical substance called chitin.
Mention two salient features of algae.
In the members of Phaeophyceaе.
- Asexual reproduction occurs usually by biflagellate zoospores.
- Sexual reproduction is by oogamous method only.
- Stored food is in the form of carbohydrates which is either mannitol or laminarin.
- The major pigments found are chlorophyll a, c and carotenoids and xanthophyll.
- Vegetative cells have a cellulosic wall, usually covered on the outside by gelatinous coating of algin.
Choose the correct answer from the options given below:
