FUst-lab Questions 1. Explain the concept of alternation of generations as it ap
ID: 266776 • Letter: F
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FUst-lab Questions 1. Explain the concept of alternation of generations as it applies to the plant world 2. Mosses and ferns show heteromorphic gencrations as they cycle between the haploid and diploid world. What does the term "hetcromorphic" mean? 3. What do the protonema and the thallus share in common? 4. Why must water be present for the bryophytes to complete the sexual portion of their life cycle? 5. In what structure does meiosis occur in the bryophytes? 6. Describe in your own words the difference between a sporophyte and a gametophyte 7. List two features which distinguish the seedless vascular plants from the bryophytes. 8. The environments in w hich ferms grow range from standing water to very dry areas. Nonetheless, all ferns are dependent upon free water in order to complete their life cycle. Explain why this is the case.Explanation / Answer
4. In Bryophytes the male sex organs are termed as antheridia while the female sex organs are termed as archegonia. During the sexual course water is needed for the male sex organs to reach out the female sex organs as the male organs are motile in nature and require a medium to reach the female organs.
5. In broyophytes the process of meiosis occurs in the sporophytic stage of gametophytic stage. This sporophyte is attached to the large gametophyte and is very dependent. The structure of sporophyte is differentiated into a foot, capsule and a stalk called seta. This capsule contains the spores which are released during reproductive process. The exact location can be called as protonema capsule where the process of meiosos occurs.
6.Difference between sporophyte and gametophyte
- sporophyte is diploid (2n) phase in the life cycle while gametohyte is haploid (n).
- the cells of sporophyte possess two sets of chromosomes while gametophytes possess one set of choromosomes which are also known as gametes.
- the formation of spores takes place through the process of meiosis while gametes are formed through mitosis.
7. The main features that distinguish seedless vascular plants from bryophytes are bryophytes do not contain the specialized structures to carry water and nutrients as they do not contain xylem. Whereas vascular plants do contain xylem which is the tissue that used for the transportation of water and other nutrients to the plant.
Bryophytes can be named as thalloids which cannot be distinguished into true roots, stems and leaves while vascular plants are differentiated into true leaves, stems and roots.
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