Annelida

Question 1

What is the literal name of Annelida?

(Remember they are segmented)

Answer 1

Annelus (latin)
“Little Ring”

Question 2

How have annelida evolved throughout the years?

(8 advancements)

Answer 2

• Have a true segmented body
• True coelom
• Circulatory system (Pumping heart; 5 hearts).
• Respiratory system (respiratory pigments).
• Bilateral symmetry
• Triploblastic
• complete digestive tract (mouth and anus)
• Nervous and excretory system.

Question 3

What are the segments called in Annelida and arthropods?

(RStarts with Meta)

Answer 3

Metameres

Question 4

Segments have external circular rings called?

Answer 4

Annuli

Question 5

What are the internal segmentats called?

Answer 5

Septa

Question 6

What is the process in which the body is divided into a series of segments?

Answer 6

Metamerism

(Occurs in Arthropods as well).

Question 7

Each segments have all major organ system : circulatory, nervous and excretory.

(true or false_

Answer 7

True

Question 8

What does metamerism do the the body of the annelida?

Answer 8

Repeat many organs along the body length.

Question 9

When the body wall muscles is divided what is the termed used for it?

Answer 9

Muscle Block

Question 10

What are the advantages of segmentation?

(3 advantages)

Answer 10

1. If a segment is injured , other segment can still function.
2. A more sophisticated nervous system.
3. Independent movement of separate segments.

Question 11

How many muscle layers do they have?

Answer 11

2 muscle layers.

Question 12

What are the names of the 2 muscle layers found in Annelida?

Answer 12

Outer circular & Inner longitudinal muscle layers.

Question 13

All annelids have tiny pairs of chitinous britsles called setae.

(True or false?)

Answer 13

False. Hirudinida (leeches) do not have these setae.

Question 14

What is the purpose of the setae?

Answer 14

Aid in anchorage, and helps firmly grip the medium through they travel/

Question 15

Annelid body have a thin outer layer of cuticle surrounding the epidermis.

(True or false)

Answer 15

True.

Question 16

What is the function of the Epithelium?

Answer 16

It secrets outer transparent moist cuticle.

Question 17

Describe the coelom found in Annelida.

(DIVIDED.)

Answer 17

• It is well-developed.
• Divided into compartments by septa.

Question 18

What is the function of the septa in the Annelida?

Answer 18

It is a cross wall that prevents fluids from shifting from one body region to another.

Question 19

What is the function of the Coalomic Fluid?

(what type of skeleton?).

Answer 19

Hydrostatic skeleton.

Question 20

What are the specialised respiratory structures?

Answer 20

Gillsa and Parapodia.

Question 21

Open or closed circulatory system?

Answer 21

Closed circulatory system.

Question 22

What are the main features included in the closed circulatory system of annelida?

Answer 22

• Blood vessels.
• dorsal and ventral longitudinal vessels
• Aortic arches (heart). Pumps blood segmentally arranged.

Question 23

Respiratory pigments are found where?

Answer 23

In the coelom fluid and blood cells.

Question 24

Where do Annelida live?

(Habitat)

Answer 24

Moist terrestrial soils, freshwater and warine.

Question 25

What is the most family annelida?

Answer 25

Earthworms.

Question 26

How many classes do annelida have?

Answer 26

2 main class and 2 main subclass.

Question 27

Polchaeta, clitellata (oligochaeta and Hirudinida) describe them. | (hair and habitat distinction)

Answer 27

Polychaeta- have many long hairs and are marine worms. Oligochaeta- have few long hairs and are terrestrial soil worms. Hirudinida- Have no hairs, and live in freshwater.

Question 28

What is the typical range of size of the annelida?

Answer 28

12 to 30 cm

Question 29

What is the diet of oligochaetes

Answer 29

feed on;Decaying organic matter, leaves and vegetation, animal matter.

Question 30

Circulation and respiration of annelida.

Answer 30

* Can diffused across body wall through moist skin. * Blood flowing through the body wall also exchanges respiratory gases with the atmosphere. * Some have gills and lungs to aid in respiration. * Blood have O2 and pigments of haemoglobin dissolved in plasma. * Oxygen combinded with respiratory pigments dissolve in plasma.

Question 31

NAME the double transport system in Annelids.

Answer 31

1. COelomic fluid 2. A closoed circulatory system.

Question 32

What does a closed circulatory system mean?

Answer 32

Blood flows continually within vessels and capillaries.

Question 33

What is the function of the dorsal vessel in the circulatory system of annelids?

Answer 33

The dorsal vessels recieve blood from the blood wall and digestive tract, which then pumps it anteriorly into 5 pairs of heart.

Question 34

What is the purpose of ventral vessel in the Annelida?

Answer 34

The heart pumps blood tot he ventral vessel then it is distributed to the brain and the rest of the body.

Question 35

What is the function of the aortic arches?

Answer 35

To maintain steady pressure of blood in the ventrla vessels

Question 36

How many hearts does the oligochaeta worm have? | (10 or 5)

Answer 36

10 hearts total. or 5 pairs.