The advantages and disadvantages of self-fertilization in flatworms. Introduction: Flatworms are the organisms that belong to the phylum “ Platyhelminthes ”. These organisms are protostomes as the first opening of their embryo develops into a mouth. The body structure of flatworm is very simple as they have a flat body with no body cavity. There is only the gastro vascular cavity in these organisms. They are considered to be the organisms that contain the simplest organs system. Tapeworm is a type of flatworm species.

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Imagine you are a botanist. Below are characteristics of a never-before described plant species recently identified as part of the ‘All Taxa Biodiversity Inventory’ (ATBI). Field Notes: Specimen collected from shaded area along stream in South Cumberland State Park (Grundy County, TN). Laboratory Analysis: Body: Large leaves emerging from underground rhizome. Size: 63 cm Chromosomal Analysis: Plant body is diploid—chromosome number of 44. Lignin test: Positive Cuticle: Present Leaves: Present—large with branched veins. Underside has sori (containing haploid spores). Roots: Present—branch from the inside. Stem: Present—vascular tissue (xylem & phloem) present. Life History: Diploid sporophyte dominant generation. Haploid spores germinate into heart-shaped, haploid, gametophyte. Water required for fertilization; no seed is produced. Diploid zygote develops into sporophyte. Explain which domain, kingdom and phylum you believe this plant should be classified…

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Question

Chapter 23, Problem 1CT

Summary Introduction

To determine:

The advantages and disadvantages of self-fertilization in flatworms.

Introduction:

Flatworms are the organisms that belong to the phylum “Platyhelminthes”. These organisms are protostomes as the first opening of their embryo develops into a mouth. The body structure of flatworm is very simple as they have a flat body with no body cavity. There is only the gastro vascular cavity in these organisms. They are considered to be the organisms that contain the simplest organs system. Tapeworm is a type of flatworm species.

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Imagine you are a botanist. Below are characteristics of a never-before described plant species recently identified as part of the ‘All Taxa Biodiversity Inventory’ (ATBI). Field Notes: Specimen collected from shaded area along stream in South Cumberland State Park (Grundy County, TN). Laboratory Analysis: Body: Large leaves emerging from underground rhizome. Size: 63 cm Chromosomal Analysis: Plant body is diploid—chromosome number of 44. Lignin test: Positive Cuticle: Present Leaves: Present—large with branched veins. Underside has sori (containing haploid spores). Roots: Present—branch from the inside. Stem: Present—vascular tissue (xylem & phloem) present. Life History: Diploid sporophyte dominant generation. Haploid spores germinate into heart-shaped, haploid, gametophyte. Water required for fertilization; no seed is produced. Diploid zygote develops into sporophyte. Explain which domain, kingdom and phylum you believe this plant should be classified…

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