BSc 1st Year Lower Non-chordates Sycon Sample Model Practice Question Answer Papers
BSc 1st Year Lower Non-chordates Sycon Sample Model Practice Question Answer Papers: BSc is a three-year program in most of the universities. Some of the universities also offer BSc Honours. After getting enrolled for BSc, there are certain things you require the most to get better grades/marks in BSc. Out of those, there are BSc Study Material, BSc Sample Model Practice Mock Question Answer Papers along with BSc Previous Year Papers. At gurujistudy.com you can easily get all these study material and notes for free. Here in this post, we are happy to provide you BSc 1st Year Lower Non-chordates Sycon Sample Model Practice Question Answer Papers.
Index for BSc 1st Year Lower Non-chordates Sycon
External Morphology of Scypha: Page 1
The canal system of Sycon: Page 2
Feeding in Sycon: Page 3
The structure and functions of cells in Sycon: Page 4
The skeleton in Sycon: Page 5
The life history of Sycon: Page 6
BSc 1st Year Lower Non-chordates Sycon Question Answers
Q.1. Describe the habit, habitat, and external morphology of Scypha.
Ans.1. Habit or Habitat
Scypha or Sycon is a marine sponge found widely distributed in nature. It found attached to submerged rocks or other substrata in shallow sea water Lear the coast. It may occur solitary or form a colony of individuals by its typical shape. budding. It is commonly called as ‘urn sponge or crown sponge’ because of its typical shape.
External Morphology
Shape: The colony has the appearance of a branching tree. It consists of two to several cylindrical branches connected together to a stolon at their bases. The latter is attached to the substratum. Each cylinder is vase-like.
Size : The size of a cylinder varies from 2-8 cms.
Colour : The sponge presents various shades of grey or light brown colour.
Osculum and oscular fringe: The free distal end of each cylinder is perforated by a wide opening, the osculum or exhalent pore. The paragastric cavity opens to the exterior through osculum. It is surrounded by numerous straight needle-like calcareous spicules arranged in a circlet. These are monaxon spicules.
Dermal pores or ostia : The body surface of Sycon presents reo arranged polygonal elevations separated by depressed lines or furrows. In the furrows are located numerous microscopic apertures, the ostia or inhalant pores. These open into the current canals. The entire body surface appears bristly as numerous monoaxon spicules protrude out from it.
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