Displaying articles by tag: Zoology Notes

BS Media in Zoology
Monday, 05 June 2017 10:54

DIGESTIVE SYSTEM AND THE PROCESS OF DIGESTION IN STAR FISH

Starfish shows an alimentary canal extending from oral to aboral side. It shows the following parts.   1. Mouth: It is present on the oral surface. It shows sphincter muscles. It is capable of great expansion and redution.   2. Oesophagus: Mouth leads into short oesophagus. This leads into stom­ach.…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Digestive System of Star Fish
  • Digestion Process in Star Fish
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BS Media in Zoology
Monday, 05 June 2017 10:37

THE STRUCTURE OF BODY WALL AND ENDO SKELETON OF STAR FISH

The body wall of star fish consists of 1. Epidermis 2. Dermis 3. Muscles and 4. Coelomic epithelium.   1. Epidermis   The epidermis is made by ciliated columnar epithelium. It secretes a thin layer of cuticle. The cuticle and epidermis will cover the tube feet, pedicellariae and dermal branchiae.…

  • Zoology
  • Zoology Notes
  • Notes
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  • Endo Skeleton of Star Fish
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BS Media in Zoology
Monday, 05 June 2017 09:19

STAR FISH - GENERAL CHARACTERS

Introduction   Star fish or Sea star is common echinoderm in the sea water. Its Zoologi­cal name is Asterias rubens. It belongs to, Phylum: Echinodermata Sub Phylum: Asterozoa Class: Stelleroidea Sub Class: Asteroidea Order: Forcipulata   The genus Asterias is represented by 100 species,   Eg: 1) A. rubens (North European…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • General Characters of Star Fish
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BS Media in Zoology
Monday, 05 June 2017 09:03

INTRODUCTION TO PHYLUM ECHINODERMATA

Jacob Klein (1734) first used the term Echinodermata for sea urchins. Linnaeus in 1758 placed Asterias, Echinus and Holothuria under Mollusca. Lamarck (1801) included these animals in the order Echinoderm of the Class Radiata. In 1847 Leuckart gave phylum rank to the Echinodermata. The Echinoderms are spiny skinned animals. They…

  • Zoology
  • Zoology Notes
  • Article
  • Notes
  • Introduction to Phylum Echinodermata
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BS Media in Zoology
Monday, 05 June 2017 08:52

EXCRETORY SYSTEM IN UNIO

The excretory system of Unio includes a pair of kidneys (organs of Bojanus) a pericardial gland (Keber's organ). The kidneys include the coelomic cavities.   Organ of Bojanus: These are present below pericardium on either side of the venacava. Each kidney has two parts.   The ventral part is brown,…

  • Excretion in Unio
  • Excretory System in Unio
  • Zoology
  • Zoology Notes
  • Notes
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BS Media in Zoology
Sunday, 04 June 2017 20:51

CHARACTERS AND CLASSIFICATION OF PHYLUM MOLLUSCA

GENERAL CHARACTERS & CLASSIFICATION OF MOLLUSCA Introduction: Mollusca includes soft bodied ani­mals. It was first applied by Ariistotle to the cuttle-fish of the Aegean Se. The Moiluscans are soft bodied, triploblastic coelomate & bilaterally symmetrical animals. There are about 10,000 living species. It is the second biggest phylum of the…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Characters of Phylum Mollusca
  • Classification of Phylum Mollusca
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BS Media in Zoology
Sunday, 04 June 2017 18:59

REPRODUCTIVE SYSTEM IN PILA (SNAIL)

Pila is a unisexual animal. Males and females are separate. Male is smaller than female. Male will show penis at the end of vas deferens.   Male Reproductive System   It shows testis, vas deferens and penis.   1. Testis: Only one testis is present. It is present in the…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Reproductive System in Pila
  • Reproductive System in Snail
  • Reproduction in Snail
  • Reproduction in Pila
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BS Media in Zoology
Sunday, 04 June 2017 18:22

EXCRETORY SYSTEM IN PILA (SNAIL)

In pila a big kidney will work as an excretory organ. It is called organ of Bojanus. It is present on the left side. It opens to the exterior.   It has two chambers. One is on the right anterior side and the second one is at the left posterior…

  • Excretory System in Pila
  • Excretory System in Snail
  • Zoology
  • Zoology Notes
  • Notes
  • Article
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BS Media in Zoology
Sunday, 04 June 2017 17:06

BLOOD VASCULAR SYSTEM IN PILA (SNAIL)

The blood vascular system cf Pila includes sinuses and blood vessels. This system contains Blood Heart, Pericardium Arteries Veins Sinuses   1. Blood   It is liquid tissue. It contains plasma and amoeboid cells. It is bluish liquid. In the plasma "haemocyanin" is dissolved. The amoeboid cells will work as…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Blood Vascular System in Snail
  • Blood Vascular System in Pila
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BS Media in Zoology
Sunday, 04 June 2017 08:43

SENSE ORGANS IN PILA (SNAIL)

Pila is an amphibian. It shows many sense organs. They are ospharadium, eyes, statocyst and tentacles 1. Ospharadium Near the left pseudepipodium attached to the pulmonary sac a leaf like ospharadium is present. It is leaf like. It is 6 to 7 mm. in length. It isbipectinate. It bears a…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Sense Organs in Pila
  • Sense Organs in Snail
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BS Media in Zoology
Sunday, 04 June 2017 08:10

NERVOUS SYSTEM OF PILA (SNAIL)

Pila shows a well-developed nervous system. This nervous system will show 5 pairs of ganglia, the connectives and commisures and nerves.   1. NERVE GANGLIC   Cerebral ganglia Pedal ganglia Visceral ganglia Pleural ganglia Supra and infra intestinal ganglia.   On the dorso-lateral sides of the buccal mass cerebral ganglia…

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  • Zoology Notes
  • Notes
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BS Media in Zoology
Sunday, 04 June 2017 07:31

RESPIRATORY SYSTEM OF PILA (SNAIL)

Pila is a amphibian. When it is in water, it will perform branchial respiration with the help of gill. When it is on land it will perform pulmonary respiration with the help of pulmonary chamber.   Branchial Respiration:   When pila is in water it will perform respiration with gill…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Respiratory System of Pila
  • Respiratory System of Snail
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BS Media in Zoology
Saturday, 03 June 2017 13:47

DIGESTIVE SYSTEM AND PROCESS OF DIGESTION IN PILA GLOBOSA (APPLE SNAIL)

In the digestive system of pila a long coiled alimentary canal and digestive glands are present. The alimentary canal will show the following parts.   1) Mouth: At the anterior end of the head mouth is present. It opens into buccal cavity.   2) Buccal cavity: Its walls are made…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Digestive system of Pila Globosa
  • Process of Digestion in Pila Globosa
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BS Media in Zoology
Saturday, 03 June 2017 12:57

STRUCTURE, PALLIAL COMPLEX AND INTERNAL SOFT PARTS OF PILA GLOBOSA (APPLE SNAIL)

Pila lives in fresh water ponds, rice fields etc. It is an amphibious form. It belongs to   Phylum: Mollusca Class: Gastropoda Sub-class: Prosobranchiata Order: Mesogastropoda.   SHELL   Shell of Pila is a single piece and hence it is called univalvia. It protects the body of the animal. The…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • Structure of Apple Snail
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BS Media in Zoology
Friday, 02 June 2017 22:05

PHYLUM MOLLUSCA

"Aristotle" recognised many Cephalopods and Gastropods. In 1650 "Johnson" coined the word "Mollusca". "Linnaeus" included "Mollusca" in the phylum "Verms". In 1790 Cuvier laid the foundation for modern classification of Mollusca. In 1818 "de Blainville" proposed "Bivahlia" name. In 1821 "Gold fuss" proposed the name "Pelecypoda". In 1862 "Bronn" proposed…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • General Characters of Phylum Mollusca
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BS Media in Zoology
Friday, 02 June 2017 21:20

DIFFERENCES BETWEEN ENDOCRINE GLANDS AND EXOCRINE GLANDS

Character Endocrine Gland Exocrine Gland i. Definition The glands whose secretions are always inside the body are called endocrine glands. The glands whose secretions come out of the body are called exocrine glands. ii. Secretions Hormones Enzymes and other than hormones iii. Passage of secretions Travel through blood Never released…

  • Zoology
  • Zoology Notes
  • Notes
  • Article
  • What are Endocrine Glands and Exocrine Glands
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