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Questions and Answers
What are the two main methods of reproduction in mollusks?
What are the two main methods of reproduction in mollusks?
Mollusks can reproduce sexually or asexually.
Describe the significance of a mollusk's shell.
Describe the significance of a mollusk's shell.
The shell protects the soft body of the mollusk.
What adaptation do squids and octopuses use for movement?
What adaptation do squids and octopuses use for movement?
They use propulsion by expelling water from their bodies.
List the characteristics that distinguish arthropods.
List the characteristics that distinguish arthropods.
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How many legs do most arthropods typically have?
How many legs do most arthropods typically have?
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What is the meaning of the name 'echinoderm'?
What is the meaning of the name 'echinoderm'?
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Where do echinoderms primarily live?
Where do echinoderms primarily live?
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What characteristic distinguishes Porifera from other invertebrates?
What characteristic distinguishes Porifera from other invertebrates?
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How do coelenterates capture their prey?
How do coelenterates capture their prey?
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Why are some sponges considered toxic to predators?
Why are some sponges considered toxic to predators?
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Where can worms typically be found living?
Where can worms typically be found living?
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Explain how worms contribute to soil health.
Explain how worms contribute to soil health.
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What are the primary habitats for coelenterates?
What are the primary habitats for coelenterates?
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How do sponges obtain food from their environment?
How do sponges obtain food from their environment?
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What type of body structure do worms have, and how do they move?
What type of body structure do worms have, and how do they move?
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Invertebrates constitute ______ percent of known organisms in the animal kingdom.
Invertebrates constitute ______ percent of known organisms in the animal kingdom.
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Porifera, also known as ______, are unusual organisms that lack tissues and organs.
Porifera, also known as ______, are unusual organisms that lack tissues and organs.
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Coelenterates have an opening in the center of their body, which is surrounded by ______.
Coelenterates have an opening in the center of their body, which is surrounded by ______.
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Worms are invertebrate animals with long, soft bodies and are often ______ into rings.
Worms are invertebrate animals with long, soft bodies and are often ______ into rings.
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Some porifera produce chemicals for protection, making them ______ to other organisms.
Some porifera produce chemicals for protection, making them ______ to other organisms.
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Coelenterates can reproduce ______ or asexually.
Coelenterates can reproduce ______ or asexually.
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Worms breathe through their ______.
Worms breathe through their ______.
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Jellyfish, sea anemones, and corals belong to the group of aquatic invertebrates known as ______.
Jellyfish, sea anemones, and corals belong to the group of aquatic invertebrates known as ______.
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Mollusks can reproduce either sexually or ______.
Mollusks can reproduce either sexually or ______.
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Some mollusks have a hard external ______ that protects their body.
Some mollusks have a hard external ______ that protects their body.
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Arthropods are distinguished by the presence of an exoskeleton, which acts as a ______.
Arthropods are distinguished by the presence of an exoskeleton, which acts as a ______.
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Many arthropods have a body divided into the cephalothorax and the ______.
Many arthropods have a body divided into the cephalothorax and the ______.
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Starfish and sea urchins are examples of ______.
Starfish and sea urchins are examples of ______.
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Echinoderms typically have a rigid and spiny surface, which gives them their ______.
Echinoderms typically have a rigid and spiny surface, which gives them their ______.
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Most arthropods can live on land or in ______.
Most arthropods can live on land or in ______.
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Study Notes
Invertebrates
- Invertebrates make up 95% of known organisms
- They lack a backbone
- Divided into six groups
Porifera (Sponges)
- Simple organisms, resembling plants
- Lack tissues, organs, brain, head, blood, or muscles
- Aquatic (freshwater or saltwater)
- Sessile (don't move) as adults
- Have pores for absorbing water and oxygen, and expelling waste
- Some produce toxins for protection
- Toxic chemicals can cause pain and skin irritation
Coelenterates (e.g., Sea Anemones, Fan Coral)
- Aquatic invertebrates (mostly marine)
- Central opening surrounded by tentacles for feeding
- Simple nervous system
- Reproduce sexually or asexually
- Many produce toxins for protection or prey paralysis
- Examples include jellyfish, sea anemones, and corals
Worms
- Invertebrate animals with long, soft bodies
- Some have segmented bodies
- Lack limbs, moving by contracting or sliding
- Live in various environments (underground, water, humid areas)
- Breathe through their skin
- Consume a lot, playing a valuable role in soil fertilization decomposing organic matter
- Reproduce sexually or asexually
Mollusks (e.g., Slugs, Squids)
- Inhabit land and sea environments
- Soft body, some with hard protective shells
- Some have one shell (e.g., queen conch, snails)
- Others have two-layered shells (e.g., clams)
- Some have no shell (e.g., slugs)
Arthropods
- 75% of animals belong to this group
- Distinguished by an exoskeleton
- Body divided into parts (legs, appendages, with joints)
- Cold-blooded, suitable for diverse environments (land, water, air)
- Excellent eyesight and hearing
- Use antennae to sense their environment
- Four subgroups: insects, arachnids, crustaceans, and myriapods
Insects (examples: wasps, beetles, butterflies)
- Usually have six legs
- Two antennae
- Eyes on each side of the head
- Some produce toxins (e.g., bees)
Arachnids (examples: scorpions, spiders, ticks)
- Eight legs
- Lack antennae
- Two body parts: cephalothorax and abdomen
- Many venomous
- Some have more than two eyes
Crustaceans (examples: lobsters, shrimps, crabs)
- Mostly aquatic
- Body divided into cephalothorax and abdomen, have a strong shell
- Two antennae on the head
- Usually have ten legs (some with pincer-like front legs for defense and food gathering)
Myriapods (examples: centipedes, millipedes)
- Many legs (more than 20)
- Body divided into rings, with two legs per ring
- Some are venomous
Echinoderms (e.g., Starfish, Sea Urchins)
- Star or round shape
- No distinguishable head
- Internal skeleton of calcareous plates with spines
- Live in water
- Some have small feet for movement
- Reproduce sexually (with larval stage)
- Some live on rocks, others in sand on the sea floor
- Approximately 7000 known species
- Lack a heart and blood
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Description
Test your knowledge on the fascinating world of invertebrates! This quiz covers major groups such as Porifera, Coelenterates, and Worms, detailing their unique characteristics and habitats. Discover what makes these creatures essential to our ecosystem!
