Invertebrate Test

Question 1

What are the characteristics of animals?

Answer 1

• Multicellular organisms sharing similar features and made of different types of cells.
• Their cells have a nucleus and organelles surrounded by a membrane – EUKARYOTIC.
• Cannot make their own food – HETEROTROPHIC – digest their food.
• Can move from place to place to find food, shelter, and mates, and can escape predators.

Question 2

What are the characteristics of invertebrates

Answer 2

• has no backbone
• Can be found on land or in water environments.
  Insects and some other invertebrates have exoskeletons.

Question 3

What is the body arrangement in bilateral symmetry

Answer 3

parts are mirror images of each other

Question 4

What are the physical characteristics of a proifera?

Answer 4

• Most are found in the ocean.
• They look like plants but they are animals.
• Sponges stay fixed in one place
• Their bodies are full of pores and their skeleton is made of spiky fibers (spicules) or rubbery spongin.
• Have no true tissue.
• Water flows through the pores of their body, aided by flagella, which enables them to catch food – FILTER FEEDERS
• reproduce sexually or asexually

Question 5

sponges reproduce sexually or asexually

Answer 5

can produce either sexually (releasing sperm) or asexually (budding)

Question 6

what is a gemmule

Answer 6

a new sponge that grows from pieces of an old sponge

Question 7

What are the characteristics of the cnidarians? What are the body shapes of the cnidarians?

Answer 7

• All cnidarians have stinging cells called NEMATOCYSTS in tentacles surrounding their mouths.
• Cnidarians are more complex than sponges.
• They have complex tissues, a gut for digesting food, and a nervous system.
• They come in two body shapes, the medusa and the polyp.
• reproduce both asexually (budding) or sexually (releasing sperm)

Question 8

How does asexual reproduction occur in the cnidarian?

Answer 8

budding

Question 9

How do the sea anemones and coral feed?

Answer 9

by catching tiny animals in their tentacles

Question 10

characteristics about hydras

Answer 10

• They live in freshwater.
• Hydras have tentacles that catch their food.
• They move from place to place.
• Hydras are very small animals.
• Reproduce asexually by budding

Question 11

What is the body symmetry for a flatworm?

Answer 11

Bilateral: They have a head and a tail, and flattened bodies

Question 12

How does the tapeworm take in nutrients?

Answer 12

host’s intestines

Question 13

What are the characteristics of the nematoda (roundworms)

Answer 13

• They have rounded bodies; body is a tube within a tube. Digestive tract has both a mouth and an anus
• They live in damp places. Can also live inside humans and other animals.
• Can make people and animals sick.
• Most wide-spread animal on earth!

Question 14

What are characteristics of organisms in the phylum Annelida (segmented worms)?

Answer 14

• Their bodies are divided into repeating segments
• They prefer burrowing through moist soil.

Question 15

how do earthworms exchange gas?

Answer 15

they take in oxygen and expel carbon dioxide directly through their skin

Question 16

what is the role of leeches?

Answer 16

secrete heparin which prevents blood from clotting

Question 17

What is the purpose of the mantle in the mollusks?

Answer 17

it’s a thin layer of tissue that covers the mollusk’s soft body and secretes the shell

Question 18

What type of circulatory system is found in mollusks?

Answer 18

closed circulatory system with blood vessels

Question 19

What are the characteristics of a gastropod?

Answer 19

• most have one shell
• Live in water or on land
• Move by gliding their large muscular foot along a trail of mucus

Question 20

What organisms are classified as cephalopods?

Answer 20

octopi and squid

Question 21

which invertebrate can fly?

Question 22

What are the stages of incomplete metamorphosis? Complete metamorphosis?

Answer 22

Incomplete:
stage one: egg
stage two: about 2 weeks after it’s a nymph
stage three: 4-7 weeks and it turns into an adult
Complete:
stage one: egg
stage two: larva
stage three: pupa
stage four: adult

Question 23

What is the purpose of the numerous legs on the centipede and millipede?

Answer 23

run from enemies

Question 24

List the physical characteristics of the phylum Echinodermata?

Answer 24

• Radial symmetry
• Top side=Arboral Bottom side = Oral
• Diets vary ~ predators, filter feeders, some eat rotting material
• Spiny skin covering an internal skeleton of plates
• Water-vascular system to help them move and eat
• Some can reproduce through regeneration from parts.

Question 25

Do the Echinodermata have an external or internal skeleton?

Answer 25

internal skeleton

Question 26

What is the function of the ampullae in the starfish? The madreporite? The ring canal?

Answer 26

• Ampullae: store the water that enters the vascular system.
• Madreporite: draws salt water into the water vascular system.
• Ring canal: carries water to the ampullae

Question 27

starfish anatomy

Answer 27

the circular top attatched to the long thing: madreporite
The long thing attatched to the circular top: Stone canal
The circle in the middle: ring canal
One of the five arms near the ring canal: Radical canal
One of the five arms away from the ring canal: lateral canal
Tube feet: the circular things around the arms