Question.
How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals?
How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals?
Solution:
Criteria for deciding divisions in plants are:
(i) Differentiated/Undifferentiated plant body
(ii) Presence/ absence of vascular tissues
(iii) With/without seeds
(iv) Naked seeds/ seeds inside fruits
Criteria for decidıng subgroups among animals are:
Kingdom Animalia is divided into two major groups on the basis of the presence or absence of a notochord. Non-chordates do not possess a notochord, while all members of the phylum chordates possess a notochord.Kingdom Animalia is divided into two major groups on the basis of the presence or absence of a notochord.Non-chordates do not possess a notochord, while all members of the phylum chordates possess a notochord.
Non-chordate is further divided into subgroups on the basis of the following features :
(1) Body symmetry
(2) Germ layers
(3) Metameric segmentation
(4) Body cavity (Coelom)
These subgroups are : Porifera, Coelenterate, Platyhelminthes, Nematodes, Annelids, Molluscs, Arthropoda and Echinodermata.
All members of the phylum chordate possess a notochord. However, some animals such asBalanoglossus, Amphioxus, Herdmania, etc. have a notochord, which is either absent or does not run the entire length of the animal's body. Therefore, these animals are kept in a separate sub-phylum called Protochordata, and the rest of the chordates are included in the sub-phylum vertebrata. The members of the sub-phylum vertebrata are advanced chordates. They are divided on the basis of presence of vertibral column into five classes: Pisces, Amphibian, Reptilia, Aves and Mammalia.
Criteria for deciding divisions in plants are:
(i) Differentiated/Undifferentiated plant body
(ii) Presence/ absence of vascular tissues
(iii) With/without seeds
(iv) Naked seeds/ seeds inside fruits
Criteria for decidıng subgroups among animals are:
Kingdom Animalia is divided into two major groups on the basis of the presence or absence of a notochord. Non-chordates do not possess a notochord, while all members of the phylum chordates possess a notochord.Kingdom Animalia is divided into two major groups on the basis of the presence or absence of a notochord.Non-chordates do not possess a notochord, while all members of the phylum chordates possess a notochord.
Non-chordate is further divided into subgroups on the basis of the following features :
(1) Body symmetry
(2) Germ layers
(3) Metameric segmentation
(4) Body cavity (Coelom)
These subgroups are : Porifera, Coelenterate, Platyhelminthes, Nematodes, Annelids, Molluscs, Arthropoda and Echinodermata.
All members of the phylum chordate possess a notochord. However, some animals such asBalanoglossus, Amphioxus, Herdmania, etc. have a notochord, which is either absent or does not run the entire length of the animal's body. Therefore, these animals are kept in a separate sub-phylum called Protochordata, and the rest of the chordates are included in the sub-phylum vertebrata. The members of the sub-phylum vertebrata are advanced chordates. They are divided on the basis of presence of vertibral column into five classes: Pisces, Amphibian, Reptilia, Aves and Mammalia.