Excretion
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Wednesday, 28 February 2018
Excretory System of Nephridia
Excretory System of Nephridia (Earthworm)
These are of three types according to their location in the body:
1. Septal nephridia
2. Integumentary nephridia
3. Pharyngeal nephridia.
1. Septal Nephridia:
These are found situated on the inter-segmental...
CYCLOMORPHOSIS IN ROTIFERS
CYCLOMORPHOSIS IN ROTIFERS
Introduction
The Morphological change those occur in certain species of invertebrates in accordance to
environmental conditions is called Cyclomorphosis. The term Cyclomorphosis was coined by Lauterborn (1904) but the actual concept came to lime light only after Coker (1939). The phenomenon has been noted in the dinoflagellates, cladocerans, and to a much striking degree in the copepods. Organisms...
Flagella and Cilia: Structure and Functions
Flagella and Cilia: Structure and Functions
Structure of Flagella and Cilia:
They are fine hair like movable protoplasmic processes of the cells which are capable of producing a current in the fluid medium for locomotion and passage of substances.
Flagella are longer (100-200 µm) but fewer. Only 1-4 flagella occur per cell, e.g., many protists, motile algae, spermatozoa of animals, bryophytes and pteridophytes, choanocytes of sponges, gastro...
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