Answer : Option CExplaination / Solution:
The gymnosperms (gymnos : naked, sperma : seeds) are plants in which the ovules are not enclosed by any ovary wall and remain exposed, both before and after fertilisation. The seeds that develop post-fertilisation, are not covered, i.e., are naked. Since, Cycas has naked seeds, it belongs to gymnosperms.
Q2.In which pteridophytes, hetersporous is produced?
Answer : Option AExplaination / Solution:
Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores are known as heterosporous.
Q3.Choose the odd one out among the following: Dryopteris, Pteris, Adiantum, Selaginella.
Answer : Option CExplaination / Solution:
Selaginella belong to class Lycopsida and other plants (Dryopteris, Pteris, Adiantum) belong to class Pteropsida of Pteridophytes.
Answer : Option DExplaination / Solution:
One of the gymnosperms, Giant sequoias are the world's largest single tree with an average height of 50–85 m (164–279 ft) and 6–8 m (20–26 ft) in diamete
Identify the plant shown in the figure given below.
Answer : Option DExplaination / Solution:
The plant shown above is cycas. This plant belongs to division Cycadophyta and family Cycadaceae. It is dioecious and Cycas circinalis species is endemic to India.
Q7.Male and female gametophytes do not have free independent existence in
Answer : Option AExplaination / Solution:
Unlike bryophytes and pteridophytes , in gymnosperms ( Cedrus )the male and the female gametophytes do not have an independent free-living existence.
Q8.The structure formed by germinated fern spore is
Answer : Option AExplaination / Solution:
Fern spores germinate to give rise to inconspicuous, small but multicellular, free-living, mostly photosynthetic thalloid gametophytes called prothallus.The gametophytes bear male and female sex organs called antheridia and archegonia.
Q9.The megasporangium of naked seed plants are called
Answer : Option BExplaination / Solution:
The cones bearing megasporophylls with ovules or megasporangia are called macrosporangiate or female strobili.
Answer : Option CExplaination / Solution:
In gymnosperms, male and female cones are formed that produce male and female gametes.The strobili bearing microsporophylls and microsporangia are called microsporangiate or male strobili. The cones bearing megasporophylls with ovules or megasporangia are called macrosporangiate or female strobili. So, cone of gymnosperms represents the reproductive organs.
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Scored Mark :
Mark for Correct Answer : 1
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