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Diversity in Living Organisms — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceDiversity in Living Organisms5 Marks
Question
Explain the importance of classification. State two differences between Gymnosperms and Angiosperms. What are the important phylums of Plant kingdom, give their names only? Write the names of the animals of the following phylums to which they belong:
  1. Porifera.
  2. Coelenterata.
  3. Annelida.
  4. Mollusca.
✓

Answer

It makes the systematic study of wide variety of organisms easier. It gives interrelationship amongst different group of organisms. It gives an idea about existing life forms on earth.
Angiosperms Gymnosperms
1 A seed is produced by flowering plants and is enclosed within an ovary 1 A seed is produced by non-flowering plants and are unenclosed or naked.
2 The lifecycle of these plants are seasonal 2 These plants are evergreen
3
Has triploid tissue
 3
Has haploid tissue
4 Leaves are flat in shape 4 Leaves are scalelike and needle-like in shape
5
Hardwood type
 5
Softwood type
6
Reproduction rely on animals
 6
Reproduction rely on wind
7 Reproductive system present in flowers (unisexual or bisexual) 7 Reproductive system present in cones and are unisexual
The major divisions of the plant kingdom are the mosses, ferns, conifers (gymnosperms) and flowering plants (angiosperms). The major phyla of the animal kingdom are the cnidarians, mollusks, annelids, arthropods, echinoderms, and chordates.
  1. Porifera: Porifera is a phylum belonging to the animal kingdom. Porifera, are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.
  2. Coelenterata: The phylum Coelenterata, also called Cnidaria includes animals such as the hydra, jellyfish, sea anemone, and the coral.
  3. Annelida: Much like humans, annelids have a closed circulatory system, which means the blood circulates through a closed network of blood vessels. In some cases, such as with polychaete worms, the blood is pumped directly through self-contracting blood vessels.
  4. Mollusca: Molluscs have more varied forms than any other animal phylum. They include snails, slugs and other gastropods; clams and other bivalves; squids and other cephalopods; and other lesser-known but similarly distinctive subgroups.

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