'Gymnosperm' have how many species?
1000
900
640
300
C.
640
Gymnosperms are seed bearing vascular plants, such as cycads, ginkgo, yews and conifers in which the ovules or seeds are not enclosed in an ovary.
About 70 Genera and 730 species of gymnosperms exist. Therefore, option 'c' is the nearest to 730 and should be considered correct.
Both gymnosperms and angiosperms bear seeds, then why are they classified separately?
What is heterospory? Briefly comment on its significance. Give two examples.
Explain briefly the following terms with suitable examples:
(i) protonema
(ii) antheridium
(iii) archegonium
(iv) diplontic
(v) sporophyll
(vi) isogamy
Differentiate between the following:
Red algae and brown algae
Differentiate between the following:
liverworts and moss
Differentiate between the following:
homosporous and heterosporous pteridophyte
Differentiate between the following:
syngamy and triple fusion
How would you distinguish monocots from dicots?
Describe the important characteristics of gymnosperms.
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