Question

explain phylum aschelminthus​

Answer 1

hi frnd...

The body of these organisms is unsegmented and triploblastic.

They have a pseudocoeloem, where the body cavity is not lined by the mesodermal layer.

They are bilaterally symmetric.

The body is cylindrical or thread like with elongated, slender worm-like appearance and tapering at both ends.

Body wall has epidermis, muscle layer and is covered by cuticle.

The body size of these organisms varies from microscopic to several centimetres in length.

These organisms are mostly parasitic, with a few free-living

They exhibit an organ system level of organization.

Externally, there is little differentiation between the anterior and posterior regions. But internal cephalization is present.

There is no distinct head. However, the mouth is present in the anterior

The digestive system is complete, with a mouth and anus.

The mouth in these organisms is terminal and is surrounded by lips bearing sense organ.

Amphids and papillae are the main sensory organs.

The nervous system consists of a nerve-ring that encircles the oesophagus. From it, nerves extend out anteriorly and posteriorly.

Respiratory organs are absent. Respiration occurs through the general body surface. It is aerobic in free-living forms and anaerobic in parasitic organisms.

The excretory system has canals and gland-like

Sexes are separate and are unisexual, exhibiting sexual dimorphism.

Fertilization is internal.

They are ovo-viviparous, oviparous or viviparous.

The life cycle of these organisms is complicated. It may be with or without an intermediate host.

hope it helps..

Answer 2

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Aschelminthus :

• It is also known as Aschelimenthus or Nematoda  

• It is parasitic Nutrition , Equatic animal and found in soil and water both.

• The body of animals belong to this phylum is cylindrical , therefore they are called RoundWorm.

• It is bilateral symmetrical,  tripoblastic and pseudocoelomatic animals .

• They have organ system grade body .

• this phylum is also called Round worm , it means worms are circular in cross section .  

• Example – Ascaris , Wucheria etc  

Symmetry :

1] Bilateral symmetry : Bilateral symmetry means body divide into two equal parts  

2] Radical Symmetry : Radical symmetry means body divide into multiple equal parts  

Germ  layers :  

1] Diploblastic : Diploblastic means body formed from two germs layer .

2] Triploblastic : Triploblastic means body formed from three germs layer .

• Colemate : Colemate means Body cavity present in the body .
• Acolemate : Acolemate means body cavity absent in the body .  

Segmentation : A body which have segment called Segmentation  

Skelation :  

1] Exoskelation : Exoskelation means hard covering of calcium carbonate present which help to protection of body  

2] Endoskelation : Endoskelation means hard covering of Calcium present which help to also protection of body  

• Chorodata : Chorodata means vertebral column present and Notochord also present  
• Non- Chorodata : Non – Chorodata means Absent vertebral column and Notochord also absent