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Biology for MTEL > Invertebrates > Flashcards

Invertebrates Flashcards

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1
Q

What is the phylum for sponges?

A

Porifera

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2
Q

What type of body symmetry do porifera have?

A

Assymmetrical

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3
Q

What is the level of organization for sponges?

A

Primitive animals, cellular garde organization

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4
Q

Motility of porifera

A

Sessile- need a substratum to attached themselves, they don’t mvoe

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5
Q

Mode of nutrition for sponges

A

Filter feeders

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6
Q

Skeleton of porifera

A

spicules or spongin fibres

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7
Q

Reproduction and fertilization of porifera

A

Hermaphrodites- internal fertilization

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8
Q

Development of porifera

A

Indirect- larval stage is morphologically distinct from the adult

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9
Q

Water transport in a porifera

A

Sponges have water transport system. Water enters through minute pores (ostia) in the body wall into a central cavity known as spongocoel. From the spongocoel water goes out through the osculum. This water system aids in food gathering, respiratory exchange and removal of wastes.

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10
Q

What are choanocytes

A

collar cells, they line the spongocoel and the canals.

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11
Q

Examples of porifera

A

Sycon, Euspongia, Spongilla.

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12
Q

What is the phylum for jellyfish?

A

Cnidaria (Coelentrata)

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13
Q

What is the level of organization for coelentrata?

A

Tissue level

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14
Q

What is the body wall of a coelentrata like?

A

They are diploblastic animals, body wall is made of 2 layers, outer ectoderm and inner endoderm.

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15
Q

Body symmetry of coelentrata

A

radial

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16
Q

Digestive system of coelentrata

A

central gastro-vascular cavity with a single opening hypostome, which serves as both the mouth and the anus.

17
Q

Digestive system of coelentrata

A

extra- and intra-cellular

18
Q

What are cnidoblasts?

A

specialized cells of coelentrata that are used for anchorage, defense and capture of prey

19
Q

Skeleton of coelentrata like corals composed of this

A

Calcium carbonate

20
Q

Two basic body forms of coelentrata

A

polyp and medusa. The polyp is a sessile form ann cylindrical in shape like the Hydra, Adamsia etc. The medusae form is umbrella shaped and free-swimming forms like Aurelia or jelly-fish.

21
Q

How do cnidarians undergo metagenesis?

A

Cnidarians which exhibit both polyp and medusae form are exhibit alteration of generation, this is known as metagenesis. Poplyps produce medusae asexually and medusae form the polyps sexually.

22
Q

Locomotion of cnidarians

A

nerve network allows movement of tentacles and body

23
Q

Examples of cnidarians

A

Aurelia (medusa), Adamsia (polyp).

Biology for MTEL (1 decks)

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