Chapter Wise BSc 1st Year Lower Non-chordates Question Answers
Chapter Wise BSc 1st Year Lower Non-chordates Question Answers & Notes Study Material: If you choose to do BSc (Bachelor’s Degree in Science). BSc is a three-year program in most of the universities. Some of the universities also offer BSc Honours. There are BSc Lower Non-chordates Study Material, BSc Question Answers, BSc Lower Non-chordates Notes along with BSc 1st, 2nd, 3rd, Year Previous Year Papers.
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Index for Chapter Wise BSc 1st Year Lower Non-chordates Question Answers
Contents
1. Phylum Protozoa: Characters And Classification
3. Monocystis (Phylum Protozoa)
4. Paramecium (Phylum Protozoa)
5. Phylum Protozoa: Miscellaneous
6. Phylum Porifera: Characters And Classification
8. Phylum Porifera (Very Short and Objective Questions)
9. Phylum Coelenterata or Cnidaria
10. Obelia (Phylum Coelenterata)
11. Aurelia (Phylum Coelenterata)
12. Phylum Coelenterata (Very Short and Objective Questions)
14. Phylum Platyhelminthes: Characters And Classification
16. Taenia Solium: The Pork Tapeworm
17. Phylum Nemathelminthes: Characters and Classification
19. Platyhelminthes and Nemathelminthes (Very Short and Objective Questions)
The soft body of calcareous sponges is supported by an endoskeleton made of a large number of minute, crystalline spicules. Calcareous spicules are megascleres, i.e., they are large. They are of various shapes and sizes. The spicules are mainly located in the mesohyal and are often projected out through the pinacoderm.
Importance of Spicules
1. These provide a supporting framework and stiffness to the sponges.
2. These are protective in function.
3. These are of variety of shapes and help in the identification of different species of sponges.
Development of Spicules
Spicules develop by the secretion of special amoeboid cells, the scleroblasts, located in the mesohyal of the sponge body. A monaxon spicule is formed by two sclerocytes produced by the division of a single scleroblast. Outer sclerocyte is called the thickener cell and the inner one as founder cell. Thickener cell is responsible for the lengthening of the spicule.
A triradiate spicule is formed by a group of three scleroblasts. Each of these gets divided into two sclerocytes forming a sextet, i.e., six cells. The tetraradiate spicule develops like a triradiate spicule, the fourth ray developing from junction of the three.
Chapter Wise BSc 1st Year Lower Non-chordates Question Answers
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