Invertebrates

Question 1

What is the phylum for sponges?

Answer 1

Porifera

Question 2

What type of body symmetry do porifera have?

Answer 2

Assymmetrical

Question 3

What is the level of organization for sponges?

Answer 3

Primitive animals, cellular garde organization

Question 4

Motility of porifera

Answer 4

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

Question 5

Mode of nutrition for sponges

Answer 5

Filter feeders

Question 6

Skeleton of porifera

Answer 6

spicules or spongin fibres

Question 7

Reproduction and fertilization of porifera

Answer 7

Hermaphrodites- internal fertilization

Question 8

Development of porifera

Answer 8

Indirect- larval stage is morphologically distinct from the adult

Question 9

Water transport in a porifera

Answer 9

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.

Question 10

What are choanocytes

Answer 10

collar cells, they line the spongocoel and the canals.

Question 11

Examples of porifera

Answer 11

Sycon, Euspongia, Spongilla.

Question 12

What is the phylum for jellyfish?

Answer 12

Cnidaria (Coelentrata)

Question 13

What is the level of organization for coelentrata?

Answer 13

Tissue level

Question 14

What is the body wall of a coelentrata like?

Answer 14

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

Question 15

Body symmetry of coelentrata

Answer 15

radial

Question 16

Digestive system of coelentrata

Answer 16

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

Question 17

Digestive system of coelentrata

Answer 17

extra- and intra-cellular

Question 18

What are cnidoblasts?

Answer 18

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

Question 19

Skeleton of coelentrata like corals composed of this

Answer 19

Calcium carbonate

Question 20

Two basic body forms of coelentrata

Answer 20

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.

Question 21

How do cnidarians undergo metagenesis?

Answer 21

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.

Question 22

Locomotion of cnidarians

Answer 22

nerve network allows movement of tentacles and body

Question 23

Examples of cnidarians

Answer 23

Aurelia (medusa), Adamsia (polyp).