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Metazoan Branches
The Kingdom Animalia comprises all the multicellular animals (metazoans). These are divided into three branches:
The Mesozoa comprise a tiny single phylum (Phylum Mesozoa); the Parazoa comprise two phyla a tiny single phylum Placozoa and the rest make up the phylum Porifera comprising the sponges. Most of the metazoans come under the major branch Eumetazoa You must note that the cellular layers of Porifera (sponges) are not homologous to the germ layers of Eumetazoa. Their developmental pattern is also quite different from that of the Eumetazoa. The Parazoa are regarded as an early evolutionary side branch of the animal kingdom, which did not give rise to any other group of animals.
Determination of Limb Polarities The limb pattern is characterized by three axes (or polarities) as displayed in diagram: (1) The direction from the shoulder (or hip) to t
Coordination of Digestion You have learnt that digestion is a process in which large food molecules arc broken down step by step into their constituents. In primitive metazoa
Explain about the Transcellular Route - Calcium? Transcellular Route: It operates primarily in the duodenum and proximal jejunum. It is stimulated when Ca ingestion is lower re
Biogeography : This is the distribution of organisms in various parts of the earth. Over periods of ecological changes, biogeography contains the study of plant or animal species i
How do mineral salts participate in enzymatic activity? Many mineral salts are cofactors of enzymes. i.e., they are substances without which enzymes do not work.
Central Nervous System Hypertension is one of the leading causes of cerebrovascular disease. It has been associated with accelerated age related cognitive decline. The most d
(a) What are the two main pollutants that contribute to acid rain? (b) Where do these pollutants come from? (c) What direct or indirect effect is 'acid rain
How much ampicillin (sodium sal, mw=371.40) would you dissolve in 400 mL of water to make 80 mg/ml solution of ampicillin?
What are plankton, nekton and benthos? Plankton, nekton and benthos are the three groups into which aquatic living beings may be separated. The plankton is formed by the alg
A newborn baby with a patent foramen ovale or a ventricular septal defect might be cyanotic (blue). Will a two-year-old with these defects also be cyanotic? Explain your answer.
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