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Porifera
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Freshwater sponges form internal asexual products called:
Gemmules are resistant asexual reproductive structures commonly formed by freshwater sponges.
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Type of canal system in Leucosolenia is:
Leucosolenia has the simplest canal system called the asconoid type.
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The skeleton of sponges is secreted by:
Scleroblasts are specialized cells responsible for secreting the skeletal elements such as spicules in sponges.
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Canal system is characteristic of:
The canal system is a unique feature of sponges that facilitates water circulation for feeding and respiration.
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Cells not found in sponges:
Cnidoblasts (stinging cells) are characteristic of cnidarians such as Hydra and jellyfish and are absent in sponges.
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The spongocoel of the sponge is lined with:
The central cavity (spongocoel) is lined by choanocytes which help circulate water and capture food particles.
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Sponges possess:
Sponges show cellular level of organization and lack true tissues and organs, which distinguishes them from most other multicellular animals.
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Most important character of all sponges:
Choanocytes (collar cells) are the most distinctive feature of sponges. Their flagella create water currents that help in feeding, respiration, and waste removal.
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Choanocytes or collar cells occur only in:
Choanocytes are specialized feeding cells unique to sponges and are responsible for generating water currents.
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Which type of cells are capable of giving rise to other types in sponges?
Archaeocytes are amoeboid cells that can transform into other cell types, playing an important role in regeneration.
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Gemmule formation in sponges is helpful in:
Gemmules are internal buds that allow sponges to reproduce asexually and survive unfavorable conditions.
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Most sponges are:
Most sponges are asymmetrical because their body organization depends on water flow and attachment to substrates.
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What is left after a bath sponge disintegrates and dries?
Commercial bath sponges consist mainly of a network of spongin fibers which remain after the living tissue is removed.
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Sponges are:
Adult sponges are sessile animals that remain attached to rocks or other submerged surfaces.
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The non-cellular layer present between pinacoderm and choanoderm in body wall of poriferans is known as:
The gelatinous non-cellular matrix between the outer and inner layers of sponge body wall is called the middle lamella or mesohyl.
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Totipotent cells of sponges are:
Archaeocytes are totipotent cells capable of differentiating into different sponge cell types.
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Which one of these is referred to as 'Venus Flower Basket'?
Euplectella is a glass sponge popularly called the Venus Flower Basket because of its beautiful lattice-like skeleton.
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Animals devoid of respiratory, excretory and circulatory organs are:
Sponges lack specialized organ systems. Gas exchange, excretion, and circulation occur by simple diffusion through the body surface.
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Internal fertilization occurs in:
In sponges like Sycon, fertilization occurs internally when sperm released into water enter another sponge.
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Which of the following cells in sponges catch food?
Choanocytes trap food particles from water using their collar-like structure and flagellum.
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