AG/BS1007 PASS Theory test 2 summary L7-13 2025

Question 1

What's the difference in the circulatory systems between Cephalopods and other Molluscs?

Accepted Answer

Cephalopods have a closed system, other Molluscs have an open system

Question 2

Is the main difference between the Echinoidea class and other classes of Echinodernata that they don't have any arms?

Accepted Answer

True

Question 3

What are the unique characteristics of the Arthropod class Chelicerata?

Accepted Answer

Chelicerae (pincers or fangs), Pedipalps (feeding etc), no antennae

Question 4

What's the main morphological difference between Platyhelminthe class Trematoda & class Cercomeromorpha (Cestoda)?

Accepted Answer

Cercomorphas have a segmented body (proglottids), Trematodes do not

Question 5

True or false: Coral is able to form from symbiotic relationships between Cnidarian polyps and algae Zooanthellae

Accepted Answer

True

Question 6

Platyhelminthes are simple acoelomates that are flattened dorsoventrally

Accepted Answer

True

Question 7

Compared to Phyla Cnidaria, is Phyla Platyhelminthes triploblastic? What does this mean?

Accepted Answer

True

Question 8

What anatomical structure in Oligochaete annelids (Earthworms) allows for locomotion?

Accepted Answer

Hydrostatic skeleton is surrounded by circular and longitudinal muscles

Question 9

What are the names of the 3 types of body cavities that exist in animals?

Accepted Answer

Acoelomate, Pseudocoelomate, Coelomate/Eucoelomate

Question 10

What is the function of Choanocytes in Porifera (sponges)?

Accepted Answer

Feeding cells for sponge nutrition

Question 11

What are the lifecycle stages of Molluscs called?

Accepted Answer

Trichophore larva -> Veliger -> Spat -> Adult

Question 12

What gives Porifera a strong anatomical structure?

Accepted Answer

Spongein endoskeleton and CaCO3 or Silica spicules

Question 13

What are the three tissue layers that exist in the animal kingdom?

Accepted Answer

Ectoderm, Mesoderm, Endoderm

Question 14

What is true about Crustacean molting?

Accepted Answer

Females molt before the mating season whereas males molt afterwards

Question 15

Is the Nematoda phyla also acoelomate like the Platyhelminth phyla? How does this influence their locomotion?

Accepted Answer

False

Question 16

Sponges have 3 body types: Asconoid, Synconoid and Leuconoid. What's the difference between them?

Accepted Answer

Feeding opportunity due to difference in surface area of choanocytes

Question 17

What are the 3 feeding groups of nematodes?

Accepted Answer

Saprophytic, Predaceous and Parasitic

Question 18

In the Mollusc phyla, what is the function of the Mantle?

Accepted Answer

Houses visceral mass & secretes shell

Question 19

What are the functions of the water vascular system in the Echinodermata phyla?

Accepted Answer

Hydraulic system: fluid-filled canals for locomotion, respiration, feeding

Question 20

Segmentation/Metamerism is introduced in the Annelid phyla: what are its evolutionary advantages?

Accepted Answer

allows specialisation of different body segments for different functions

Question 21

How did the Cnidarian phyla get its name?

Accepted Answer

They have stinging cells called cnidocytes

Question 22

Select the Platyhelminth species that causes deadly hydatid cysts in indirect hosts (Including livestock and humans!)

Accepted Answer

Cestode Echinococcus granulosus

Question 23

What are some features of the venom produced by species in the Chelicerata Order Araneae?

Accepted Answer

Made from amino acids, stored in fang glands, start digestion

Question 24

Do Cnidarians have a mesoderm?

Accepted Answer

False

Question 25

What are the anatomical structures that characterise the Arthropod Cl. Hexapoda?

Accepted Answer

3 body regions, 3 pairs of legs, 1 pair of antennae, open circulation

Question 26

Compared to Ph. Platyhelminthes, does Ph. Nematoda reproduce sexually with dioecious sexes?

Accepted Answer

True

Question 27

How do filter-feeding Polychaete marine annelids obtain their food?

Accepted Answer

Fan (Sabella) structures and Mucus bags (Chaetopterus)

Question 28

What are some general anatomical features of ALL ARTHROPODS?

Accepted Answer

Exoskeleton (chitin), Ecdysis (molting), Jointed appendages

Question 29

What is the main difference between protostomes and deuterostomes in embryonic development?

Accepted Answer

protostome blastopores become the head, deuterostomes' become the anus

Question 30

How does the free-living Durgesia spp of the Platyhelminth phyla reproduce?

Accepted Answer

Asexually & Hermaphrodite

Question 31

What are the Cnidarian classes? Give some examples!

Accepted Answer

Anthozoa, Staurozoa, Hydrozoa, Cubozoa, Schyphozoa

Question 32

Anamorphosis is a unique characteristic of Myriapods (centipedes/millipedes): What are the 3 kinds?

Accepted Answer

Euanamorphosis, Hemianamorphosis and Teloanamorphosis

Question 33

Are Cnidarians polymorphic?

Accepted Answer

True

Question 34

What are the names of the 2 types of Hexapod metamorphosis?

Accepted Answer

Holometabolous (complete) & Hemimetabolous (incomplete)

AG/BS1007 PASS Theory test 2 summary L7-13 2025

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AG/BS1007 PASS Theory test 2 summary L7-13 2025

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