Metazoa, Biology

Assignment Help:

Metazoa

In the two kingdom classification, the unicellular 'animals' used to be clubbed together under a single phylum Protozoa that constituted sub-kingdom - Protozoa. The rest of the animals, all multicellular, were grouped under the sub-kingdom Metazoa under various phyla (the corresponding grouping for plants was Protophyta and Metaphyta). However, under the present concept of Five Kingdom Classification, this grouping has no relevance. Still, we often continue to use the term Metazoa to refer to the Animalia of the five kingdom classification. In this we start with an explanation of the levels of body organization in animals and the basic animal body plan. However, diverse the different invertebrates and vertebrates may appear to the eye, it is possible to group them in four master body plans.

These are the unicellular plan, the cell aggregate plan, blind sac plan and tube within a tube plan. The protozoan fall into the first category and the rest three structural plans are seen in the metazoans. We next list out the characteristic features of metazoans. We shall also discuss those features that are considered of fundamental importance for describing and understanding the structure and classification of any animal. These characters are:

  • Cleavage patterns and number of germ layers it has been derived from
  • Its body symmetry
  • Nature of body cavity
  •  Segmentation and cephalisation

 


Related Discussions:- Metazoa

How the blood sugar level is maintained at a stable level, Discuss how the ...

Discuss how the blood sugar level is maintained at a stable level in the well fed and fasting state In  the fed state, clearance of blood  glucose is mainly by  liver via gluc

Define the roller drying (drum drying) method, Define the Roller Drying (Dr...

Define the Roller Drying (Drum drying) Method? One of the important techniques for drying liquid food products is the roller drier. Like spray drying, roller drying can only be

Immunofluorescence test and its applications, Question 1 Discuss the Follo...

Question 1 Discuss the Following                    a) Immune response                    b) Immunofluorescence test and its applications Question 2 Answer the following ques

What are the factors that limit ability to fully classify, What are the fac...

What are the factors that limit our ability to fully classify and understand microbial diversity and what implications do these challenges have for environmental and health managem

Define advantages and disadvantages of swab method, Define Advantages and D...

Define Advantages and Disadvantages of Swab Method? Advantages of Swab Method 1. Suitable for flexible, uneven and heavily contaminated surfaces. 2. Rapid, simple and ine

Diffrence between fish epidermis and amphibian epidermis, Q. How different ...

Q. How different is the fish epidermis from the amphibian epidermis? The fish epidermis is very contains and thin mucus-secreting cells the fish skin doesn't present keratin, t

Explain starch phosphates monoesters, Explain Starch phosphates monoesters ...

Explain Starch phosphates monoesters and  Hydroxypropyl starches   Starch phosphates monoesters Emulsifying agent and thickening agent. Hydroxypropyl starches

Limitations of five-kingdom classification, Limitations of Five-Kingdom Cla...

Limitations of Five-Kingdom Classification As already pointed out, each system of classification has its own limitations. The two-kingdom system has outlived its usefulness as

Explain about the carbohydrate malabsorption, Explain about the Carbohydrat...

Explain about the Carbohydrate Malabsorption? Carbohydrates malabsorption is usually caused by an inherited or acquired (in intestinal infection, celiac disease, PEM) defect in

Soyabean and sesame proteins - mutual supplementation, Define Soyabean and ...

Define Soyabean and sesame proteins - mutual supplementation of Protein? Soyabean and sesame proteins: Soyabean proteins are good sources of lysine but are deficient in methion

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd