criteria for new system of classification

Question 1

which criteria are used for the new system of classification?

Answer 1

grades of organization
body symmetry
germinal layers
body cavity
body segmentation

Question 2

how many grades of organization are there? name them

Answer 2

five
Protoplasmic grade of organization
cellular grade organization
cell-tissue grade organization
tissue-organ grade organization
organ-system grade organization

Question 3

what is protoplasmic grade organization? give examples

Answer 3

in unicellular organisms, all functions of life are performed by the same cell
body organization of such cells is called protoplasmic grade organization
ex; amoeba, paramecium

Question 4

what is cellular grade organization? give examples

Answer 4

in case of multicellular organisms, if tissues are not formed, their body organization Is called cellular grade organization
ex; phylum porifera

Question 5

what is cell-tissue grade organization? give example

Answer 5

In case of some animals, cells come together to form tissues with the help of which all body functions are performed. Body organization of such animals is known as cell-tissue grade organization
ex; phylum cnidaria

Question 6

what is tissue-organ grade organization? give examples

Answer 6

in this type of organization, tissues are organized to form some organs
however, complete organ systems are not formed
ex; phylum platyhelminthes

Question 7

what is organ-system grade organization? give examples

Answer 7

in this type of organization, different organs are joined together to form an organ system that performs specific functions
ex; human, frog, crab, etc

Question 8

what are body symmetry and its types?

Answer 8

in an imaginary sense, if the body of any animal is cut through an imaginary axis of the body, it may or may not produce two equal halves
depending on this property, there are 3 different types of animal bodies
asymmetrical body
radial symmetry
bilateral symmetry

Question 9

what is asymmetrical body? give examples

Answer 9

in the case of such a body, there no such imaginary axis of the body through which we can get equal parts
ex; some sponges

Question 10

what is radial symmetry? give example

Answer 10

in this type of body, if an imaginary cut passes through the central axis but any plane of the body, it gives two equal halves
ex; in the case of starfish, there are five different planes passing through the central axis of the body through which we can get two equal halves

Question 11

what is bilateral symmetry? give example

Answer 11

in this type of body, there is only one such imaginary axis of the body through which we can get two equal halves
ex; fishes, insects, humans, etc

Question 12

in case of multicellular organisms, when are germ layers formed?

Answer 12

during initial period of embryonic development

Question 13

different tissues in the body are formed from?

Answer 13

germ layers formed during initial period of embryonic development

Question 14

what are germ layers?

Answer 14

in case of multicellular organisms, germ layers are formed during initial period of embryonic development
from these germ layers, different tissues are formed in the body

Question 15

what happens in organisms having diploblastic body?

Answer 15

in the case of organisms having diploblastic bodies, only two germ layers are formed- endoderm and ectoderm
ex; phylum cnidaria

Question 16

what happens in organisms having triploblastic body?

Answer 16

in organisms having triploblastic body, three germ layers are formed- endoderm, mesoderm and ectoderm

Question 17

what is body cavity/coelom?

Answer 17

cavity between the body wall and internal organs is called as body cavity or coelom

Question 18

eucoelomates? with examples

Answer 18

in case of multicellular organisms that are eucoelomates (animals with true body cavity), during initial period of their embryonic development, body cavity is formed from mesoderm
ex; annelida and all phyla after annelida

Question 19

acoelomates? examples

Answer 19

in case of acoelomates, body cavity is absent
ex; phyla porifera, cnidaria and platyhelminthes

Question 20

pseudocoelomates? examples

Answer 20

in case of pseudocoelomate animals, they have body cavity but it is not formed by the ways of eucoelomates or acoelomates
ex; phylum aschelminthes

Question 21

what is body segmentation?

Answer 21

if the body of an animal is divided into small, similar units, then such body is called as segmented body
each small unit is called as a segment
ex; animals like earthworm from phylum annelida