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Economic Importance of Porifera or Sponges

Economic Importance of Porifera or Sponges

In this lesson we will learn about some economic importance of sponges Sponges are mostly beneficial to man and other animals while only a few sponges are really harmful A. Useful Sponges 1. Sponges as food Though due to disagreeable taste, strong unpleasant odour and the bristly spiculation, the sponges are generally well protected animals, but there are certain animals which even feed upon…

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#Economic Importance of Porifera or Sponges #harmful sponges #phylum porifera #porifera importance #venus flower basket #what are the importance of phylum porifera

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General Characteristics of Porifera

General Characteristics of Porifera

Sponge is another name for poriferans. Poriferans are multicellular organism and are attached directly from its base with substratum without a stalkMost of them are marine while a few are fresh water forms. The body of Sponges is not symmetrical and cylindrical in shape or they may have radial symmetry. The body wall is made up of two layers: pinacoderm (outer layer) on the outside (inner layer)…

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#General Characteristics of Porifera #oscullum #osyia #phylum porifera #pinacoderm #porifera general charatctes #sponges #Youtube

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What are the different types of Speciation

What are the different types of Speciation

In this Lesson we are going to discuss about : What is Speciation ? Examples of Speciation What are the different types of Speciation ? Allopatric Speciation Sympatric Speciation Parapatric Speciation Speciation Speciation is the division of a lineage into two or more distinct species. When gene flow between sister populations is sufficiently restricted, each becomes irreversibly…

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#allopatric sympatric parapatric #Speciation #What are the different types of Speciation #what is speciation

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Ecology

What is Ecology Ecology is the study of the relationships between living organisms and their environment, the interaction of organisms with each other, and the pattern and cause of the abundance and distribution of organism in nature. As a result, ecology is a study that seeks to answer questions about how nature functions. To describe such a relationship between Organism and its environment,…

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#Ecology #ecology and its environment #ecology class 12 #Ecology for neet #organism and population #organism and population class 12

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Genome and Genome Complexity

Genome and Genome Complexity

Genome  The Genome is defined as the totality of all the DNA of an organism. Most genomes (all eukaryotes and prokaryotes and some viruses) are made of DNA but a few viruses have RNA genome. The eukaryotic genome consists of two distinct parts: The nuclear genome and the Organelles (mitochondrial and chloroplast) genome.  The amount of DNA present in the haploid genome of species is called…

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Repetitive Sequences

What is Repetitive Sequences ? There are two general types of genomic sequences : Nonrepetitive DNA (consists of sequences that are unique i.e., there is only one copy in a haploid genome) and Repetitive DNA (sequences that are present in more than one copy in a haploid genome). Repetitive sequences show more rapid renaturation rates than the nonrepetitive DNA sequences. The proportion Of the…

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Nervous System of Cockroach (explained with diagram)

Nervous System of Cockroach (explained with diagram)

The Nervous System of Cockroach can be Divisible into Three Parts: (i) The central nervous system, (ii) Peripheral nervous system, (iii) Visceral or sympathetic nervous system. Central Nervous System of Cockroach: The central nervous system consists of the supra-oesophageal ganglion or brain, sub- oesophageal ganglion and the nerve cord. The supra-oesophageal ganglion or cerebral ganglion…

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Nervous system of cockroach

Nervous system of cockroach

The nervous system of cockroach consists of a series of fused, segmentally arranged ganglia joined by paired longitudinal connectives on the ventral side. Three ganglia lie in the thorax, and six in the abdomen. The nervous system of cockroach is spread throughout the body. The head holds a bit of a nervous system while the rest is situated along the ventral (belly-side) part of its body. If the…

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Primitive Nervous System

Coelenterata Consistent with their radially symmetrical bauplan, cnidarians have a diffuse, noncentralized nervous system.The neurosensory cells of the system are the most primitive in the animal kingdom, being naked and largely nonpolar.Usually the neurons are arranged in two reticular arrays, called nerve nets, one between the epidermis and the mesenchyme and another between the gastrodermis…

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Excretory System of Earthworm : Nephridia

Excretory System of Earthworm : Nephridia

The process of removal of metabolic waste products including nitrogenous material like ammonia, urea, uric acid, amino acid, etc. from the body is called excretion. Excretory system consists of nephridia as excretory organ which is analogous to kidney of vertebrates. Nephridia are porous, long, thin and coiled tube which are found in all segments except first three. Types of Nephridia According…

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Nephridium : Meaning, Physiology and Function

Nephridium : Meaning, Physiology and Function

Definition of Nephridium: An excretory tubule which opens to the exte­rior through the nephridiopore and the inner end of the tubule is blind (associated with termi­nal cells or solenocytes) in the protonephridium or opens in the coelom through the ciliated funnel or called nephrostome in metanephridium. Structure of a Typical Nephridium: (i) A typical nephridium (Fig. 17.58) con­sists of a…

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Excretory Organs in Invertebrates

Excretory Organs in Invertebrates

In this lecture you will be able to know about Contractile Vacuoles in ParameciumExcretory System of Planeria (With Reference to Flame Cells)Excretion in Taenia SoliumExcretion in Earthworm with Reference to NephridiaExcretion in Cockroach with reference to Malpighian TubulesExcretion in Prawn with Reference to Green GlandExcretion in Bivalve with Reference to Organ of Bojanus 1. Contractile…

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Balanoglossus : A Tongue Worm

Balanoglossus : A Tongue Worm

In this article we will discuss about Description of BalanoglossusExternal Features of BalanoglossusDigestive System of BalanoglossusBlood Vascular System of BalanoglossusNervous System of BalanoglossusReproductive System of BalanoglossusTornaria LarvaMetamorphosis of Balanoglossus Description of Balanoglossus Hemichordata (Gr. hemi, half; chorde, cord), till recently treated as a subphylum of…

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EXCRETION

Learning objectives By the end of this section, you will be able to: Explain how vacuoles, present in microorganisms, work to excrete wasteDescribe the way in which flame cells and nephridia in worms perform excretory functions and maintain osmotic balanceExplain how insects use Malpighian tubules to excrete wastes and maintain osmotic balance Microorganisms and invertebrate animals use more…

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Balanoglossus

Respiratory System The respiratory organs of Balanoglossus comprise: (1) The branchial portion of pharynx bearing gill-slits (2) The branchial sacs that open out through gill-pores Branchial Pharynx: Two lateral longitudinal para-branchial ridges divide the pharyngeal cavity into a dorsal respiratory or branchial portion and a ventral digestive portion. Dorso-laterally, on each side, the…

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Torsion and Detorsion in Gastropoda

Torsion and Detorsion in Gastropoda

Torsion in Gastropoda:

Mollusca are usually bilaterally symmetrical, but this symmetry is lost in Gastropoda due to two processes called coiling and torsion. There is a requirement for digestion and resorption to be restricted to the dorsal digestive gland or liver, and the liver undergoes expansion to form a projection that expands so much that it falls to one side, allowing the food canal to…

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Tricks to crack NEET 2021

Tricks to crack NEET 2021

The National Testing Agency (NTA) conducts the National Eligibility cum Entrance Test (NEET) once a year, which is the single largest medical entrance examination in India. And Biology is the only subject in NEET 2021 that includes the maximum number of questions. Therefore to eliminate any kind of confusion and panic about how to prepare biology for the subject of NEET 2021, Gulati’s Biologybrin…

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