Observation: Liverworts Obtain a living sample of the liverwort MarchantiaFig. 1
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Observation: Liverworts Obtain a living sample of the liverwort MarchantiaFig. 14.8) thallus, body of the plant. Examine it under the stereomicroscope. What generation is this sample? Identify the folowing: 1. The gametophyte consisting of lobes. Each lobe is about a centimeter or so in length, the upper sorface is smooth, and the lcwer surface bears numerous rhizoids (rooklike hairs). 2. Gemma cups on the upper surface of the thallus. These comain groups of cells called gemmae that can asexually start new plants. 3. Disk-headed stalks bear astheridia, where flagellated sperm are produced 4. Umbrella-headed stalks bear archegonia, where eggs are produced. Following fertilizasion, tiny sporophytes arise from the archegonia. Figure 148 Liverwort, Marchontia. a. Gemmae can detach and stert new plants. b. Antheridia are present in disk-shaped structures. &. Archegonia arve present in umbrella-shaped structures. JM C lun SecerySernca 14.3 Seedless Vascular Plants Seedless vascular plants include the lycophytes (club mosses) and pteridophytes-ferns and their allies, the whisk ferns and honsetails. These plants were prevalent and quite large during the swampy forest Carbomiferous period. At that time, the coal deposits still used today were formed. The sporophyte is dominant in the seedless vascular plants. The dominant sporophyte has adaptations for living on land; it has vascular tissue and produces windblown spores. The spores develop into a separate gametophyte generation that is very small (less than 1 cm). The gametophyte lacks vascular tissoe and produces flagellated sperm 1. Place a check mark beside the phrases that describe seedless vascular plants: has vascular tissue Sperm protected from drying out Flagellated sperm 2. Which listing (I or II) would you expect to find in a plant fully adapted to a land evironment?_ Explain. Are seedless vascular plants fully adapted to living on land? Explain your a 4-7 Laboratory 14 Nonvasculse Plants and Seedless Vasculiar Plants 173Explanation / Answer
1. The answer is 1. The gametophyte consisting of lobes.
Explaination:
The dominant phase of the the bryophyte life cycle is the gametophyte. The small green plant you find as a moss or a liverwort is the haploid gametophyte.
The gametophyte plant body is called a thallus which means that it lacks xylem and phloem and therefore does not have true stem, true leaf and true root.
Gametophyte develops a system of rhizoids and facilitates the absorption of minerals.
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