Question

(a) In which phylum are these animals included?
(b) Out of the two which has locomotory organs? How many are they?
(c) Which animal out of the two is harmful? Why?​

Answer 1

Answer:

which animals are u talking about

please inform so I can reply

Answer 2

(a) In which phylum are these animals included?

(b) Out of the two which has locomotory organs? How many are they?

(c) Which animal out of the two is harmful? Why?​

The image that is missed in question is attached below .

Explanation:

1. These animals belong to :

a)Phylum Chordata  

 .They are characterized by three important features:

• Dorsal, hollow, tubular nerve cord  

• Notochord that is replaced by a bone or cartilage to form vertebral column.

• Paired gill slits in pharynx  

Body is bilaterally symmetrical, segmented, triploblastic and with coelom.

• A post anal tail is present at some stage.

• Segmental muscles in unsegmented trunk.

• Ventral heart with dorsal and ventral blood vessels  and closed blood vascular system.

• Complete digestive system.  

• Endoskeleton present.  

• This is the most advanced group of animals.

Chordata is divided into two groups:

Protochordata

Vertebrata

Vertebrata

 

o Animals that have vertebral column and cranium.

o They are primitive.

o They are without paired appendages.

o They are without true jaws.

Its subphylum is: Gnathostomata.  

 Vertebrates with jaws and paired appendages.

The subphylum is divided into the following 6 classes.Lets study about them :

Class 1 Chondrichthyes  

 

• It includes marine fishes with cartilaginous endoskeleton.

• Streamlined body is either laterally compressed and spindle-shaped or flattened and disc-shaped.

• Mouth is ventral in position.  

• Skin is covered with scales.

• Tail or caudal fin is present for movement.

• Heart is 2 chambered.  

• Digestive system has J - shaped stomach.

• Alimentary canal and urinogenital ducts open into common aperture called cloaca.

• Ureotelic Animals.  

b)Phylum Platyhelminthes

• Bilateral symmetry.  

• Body is thin, leaf - like.  

• Triploblastic and without body cavity.

• Digestive system with single opening that is mouth, no anus present.

• Circulatory, skeleton and respiratory systems absent.

• Excretory system consists of blind tubules called protonephridia whose end bears flame cells.

• Hermaphrodite organisms  

• Example: Planaria, Fasciola, Taenia solium, etc.  

2.Out of the two : The organism belonging to phylum chordata has locomotory organ that is paired and unpaired fin and number can vary .

The unpaired fins are the:

• Dorsal
• Caudal
• Anal

The paired fins are called:

• Pectorals
• Pelvics.

3.The Platyhelminthes are harmful because their mode of nutrition is hetrotrophic that is parasitic .

They either live in or on the body of host to obtain nutrition and can cause many harms .