NCERT Class 9 Science Solutions: Chapter 7 – Diversity in Living Organisms Part 5 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 5:

Q. How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals?

A.

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 Deciding Divisions in Plants for Diver …

Criteria for deciding subgroups among animals are:

Kingdom Animalia is divided into two major groups on the basis of the presence or absence of a notochord.

Criteria for Deciding Subgroups Among Animals for D …

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:

Non-Chordate is Further Divided into Subgroups for …

On the basis of the above features, non-chordates are divided into the following subgroups: Porifera, Coelenterate, Plathyhelminthes, Nematodes, Annelids, Molluscs, Arthropoda, Echinodermata and Chordata.

Non-Chordates Are Divided into the Following Subgr …

All members of the phylum chordate possess a notochord. However, some animals such as Balangossus, Amphioxus, Herdmania, etc. have a notochord, which is either absent or does not run the entire length of the animals 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 into five classes: Pisces, Amphibian, Reptilia, Aves, and Mammalia.

Phylum Chordate Possess a Notochord for Diversity …

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