Some Basics About Animals And Zoology

Question 1

Animals

Answer 1

Multicellular organization with heterotrophic nutrition having nervous tissue or nervous system.
Exception = sponges (parazoan)
Para = parallel and zoan = animals…parazoan lacks nervous system or nervous tissue.

Question 2

First phyllum with nervous tissue

Answer 2

Hydra (cnidaria)

Question 3

Grade of organization

Answer 3

1) acellular/protoplasmic grade
Eg protozoans (unicellular organisms mein hi hota hai)
2) cellular grade
Eg sponges
3)  tissue grade
Eg hydra 
4)  organ grade
Eg platyhelminthes
4)  organ system grade
Eg aschelminthes to chordata

Question 4

Body symmetry

Answer 4

1) asymmetrical symmetry = eg sponges (porifera) amd gastropod mollusc (adult)
2) symmetrical symmetry = 2 types
a ) radial symmetry = eg hydra
b) bilateral symmetry = eg platyhelminthe sto chordata except echinodermata (pentaradial symmetry) and larva of gastropod mollusc.

Question 5

Saggital plane
Cephalisation
Anterior end

Answer 5

Radial plane parallel to oral aboral or central axis
Formation of head
The end through which it moves forward

Question 6

Body cavity

Answer 6

Space between body wall (ectodermal)and gut wall (endodermal)

Question 7

Coelem

Answer 7

Body cavity lined by mesoderm

Question 8

Different names of parietal mesoderm and visceral mesoderm

Answer 8

Parietal mesoderm or parietal mesothelium or parietal serosa.
Visceral mesoderm or visceral mesothelium or visceral serosa (secrets coelmic fluid)

Question 9

Germ layer

Answer 9

Primodia of tissue
2 types
a) primary germ layer = ectoderm
mesoderm
b) secondart germ layer = derived from primary germ layer …. mesoderm

Question 10

What are diploblastic and triploblastic animals?

Answer 10

Diploblastic= animals having only primary germ layer.
Triploblastic= animals having both primary and secondary germ layer.