Lab 3 The Nonvascular Plants and Vascular Plants Questions 1. Describe the funct
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Lab 3 The Nonvascular Plants and Vascular Plants Questions 1. Describe the function of each generation in the life cycle of plants 2. What is the dominant generation of a moss? Is this generation haploid or diploid 3. What role does water play in the reproductive life cycles of nonvascular plants? 4. Is the moss sporophyte photosynthetic? 5. List the two means by which liverworts reproduce asexually. 6. What is the function of the rhizoids in plants? 7. Is the liverwort thallus haploid or diploid? 8. What is the function of elators in a liverwort? 9. Which is the dominant generation in all vascular plants? 10. What are an immature leaf and mature fern leaf called, respectively? 11. Is the prothallus in fern haploid or diploid? Does it produce gametes or spores? 12. What type of environmental conditions are required for the prothallus in fern to survive. Why? 13. What is the function of an indusium in fern? 14. Why are horsetails normally found growing along streams, rivers or irrigation ditches?Explanation / Answer
1. The lifecycle of plants contain gametophyte and sporophytic generations. In nonvascular plants gametophyte is dominant with prolonged life than the sporophyte. Gametophyte forms the sporophyte and nourishes it. The sporophyte life span is limited and it produces haploid spores. The gametophyte is haploid and produces gametes that fuse to form diploid zygote and develop into diploid sporophyte.
2. In mosses gametophyte is dominant over sporophyte. The gametophyte is haploid. it produces the haploid gametes that fuse and produce diploid zygote and it develops into diploid sporophyte and produces haploid spores that give rise to haploid gametophyte again.
3. Nonvasular plants produce flagellated gametes. Thus, water has an important role in their life cycles. The flagellates sperms swim in water and reach the egg and fuse to form the zygote.
4. The sporophytes contain plastids and are photosynthetic. They produce numerous spores. The sporophyte remains attach to gametophyte and the gametophyte nourishes it. The sporophyte contains structures such as foot, seta, and sporangium. The foot helps in the absorption of nutrients from gametophyte. The seta or stalk conducts the minerals to sporangium known as capsule. The capsule produce spores by meiosis. Capsule contains a rink like mouth with tooth like structures called peristome. The peristome is useful to discharge the spores
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