Short Answer Type
Long Answer Type
Match The Following| A. Chlamydomonas | (i) Moss |
| B. Cycas | (ii) Pteridophyte |
| C. Selaginella | (iii) Algae |
| D. Selaginella | (iv) Gymnosperm |
Long Answer TypeDescribe the important characteristics of gymnosperms.
Important features of gymnosperms are:
(a) The plant bears naked seeds i.e., the seeds of these plants are not enclosed in ovary walls.
(b) They include medium sized trees, or tall trees and shrubs.
(c) Generally tap root is present and some plants have fungal association called Mycorrhiza which fix nitrogen from atmosphere. The stem can be or un-branched. Leaves can be simple or compound and may be needle like having sunken stomata.
(d) Gymnosperms are heterosporous. They bear two kinds of spores – microspores and megaspores.
(e) Flowers are absent. The microsporophylls and megasporophylls are arranged to form compact male and female cones.
(f) The male and the female gametophytes do not have an independent existence. The male and female gametophytes are dependent on the sporophyte.
(g) Pollination occurs mostly through wind.
Multiple Choice QuestionsFusion of two gametes which are dissimilar in size is termed as
Oogamy
Isogamy
Anisogamy
Zoogamy
Holdfast, stipe and frond are found in
Rhodophyceae
Chlorophyceae
Phaeophyceae
All of the above
A plant shows thallus level of organization. It shows rhizoids and is haploid. It needs water to complete its life cycle because the male gametes are motile. Identify the group to which it belongs to
Pteridophytes
Gymnosperms
Monocots
Bryophytes
Plants of this group are diploid and well adapted to extreme conditions. They grow bearing sporophylls in compact structures called cones. The group in reference is
Monocots
Dicots
Pteridophytes
Gymnosperms
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