Ch 6 Animal Diversity Flashcards Preview

organismal Biology > Ch 6 Animal Diversity > Flashcards

Flashcards in Ch 6 Animal Diversity Deck (26):
0

What is true about sponges

The advent of multicellularity
They are the simplest multicellular animals

1

What are some advantages of multicellularity

Dividing a mass into smaller units greatly increases the surface area available for metabolic activities

2

How are sponges different from other metazoans?

The sponges body is an assemblage of cells embedded in and extracellular matrix and supported by A skeleton of spicules and protein

3

What two grades are metazoans divided into?

Parazoa & eumetazoa

4

What is the phylum of sponge

Porifera- means porous bearing

5

What is a placozoan?

Marine organisms they are 2 to 3 mm in size they are made up of dorsal and ventral at the Celia with a synctial middle layer

6

What is the syncytial middle layer made up of?

Consists of a single plasma membrane with multiple nuclei inside

7

When does the synctium form?

When cells fuse

8

How do sponges eat?

Sponges have pores and tiny canals that constitute a filter feeding system for there in active lifestyle

9

What does sessile mean?

Use water currents to bring food and oxygen and carry away waste

10

What is a spicule?

Calcium carbonate or silica and collagen

11

Explain sponges organ system

They don't have any organs or true tissues

12

How does sponges reproduce

Disassociated sponge cells can reform a new body

13

Explain the sponge body in three points

No nervous system or sense organs
Simplest contractile elements
Brightly colored because of pigments in dermal cells

14

How old are sponges

They can date back to the Cambrian period

15

What are the four classes or perforans

1. Calcarea (having calcareous spicules)
2. Dermospongiae (having a skeleton of silieous spicules or spongin or both)
3. Hexactinellida (having 6-rayed silocaeus spicules)
4. Homoscleromorpha (thin, encrusting, sponges that have simple spicules or none

16

How many sponge species are there

5000 or more

17

How many species of freshwater sponge are there

Around 150

18

Describe the sponge embryos

They are free swimming

19

Do adult sponges move around?

Adults are always attached to rocks, shells, corals, or other submerged objects

20

What three things do growth patterns depend on

1. Shape of substratum
2. Direction/speed of current
3. Availability of space

21

What is a commensal?

Parasites

22

What are some commensals for sponges?

Crabs, mites, nudibranchs, bryozoans, and fish

23

Why do sponges have few enemies?

They have an elaborate skeletal frame work, they have a noxious odor, and they taste bad

24

What kind of chemicals to sponges produce?

Bioactive

25

What can bio active chemicals given off by the sponges be used for?

They can be treated for leishmaniasis, herpetic infections and antimicrobial and antiviral effects