Questions about how echolocating animals use sound waves to navigate and hunt.
A document titled "Echolocating Animals" with a list of questions about echolocation in animals like dolphins and bats.
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Step-by-step solution for: Evolution of Echinoderms Video Worksheet
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Show Answer Key & Explanations
Step-by-step solution for: Evolution of Echinoderms Video Worksheet
Here are the answers to the questions on the worksheet based on the text provided.
1. What type of system do echinoderms use for the vascular system?
They use a water-vascular system.
2. How does an echinoderm move?
They move using tube feet that extend from their body. These feet work like little suction cups to grip surfaces and pull the animal along.
3. What type of food do echinoderms have?
Most echinoderms eat other animals (carnivores) or dead organic matter (detritus). For example, sea stars often eat clams and oysters.
4. What percentage over 1,500 types of Echinoderms?
*(Note: The question in the image is cut off or phrased strangely, but it likely asks about the diversity or number of species. Based on general biology knowledge usually paired with this text: There are approximately 6,000 to 7,000 living species of echinoderms today. If the question refers to the text saying "over 1,500 types," it might be referring to a specific subgroup or an older statistic, but generally, they are a large phylum.)*
Now read the movie *Echinoderms Ultimate Animal* and answer the following questions:
1. What is the scientific name for a starfish?
The scientific name for the group is Asteroidea. A common specific starfish is *Asterias rubens*.
2. What happens when the urchin is turned on its side and has a deadly attack?
When a sea urchin is flipped over, it uses its tube feet and spines to flip itself back upright. It does not have a "deadly attack" in this context; it is trying to right itself.
3. Is an echinoderm’s mouth located on the top or bottom of its body?
The mouth is located on the bottom (the oral side) of the body.
4. What is the echinoderm body plan called?
It is called pentaradial symmetry (or five-part radial symmetry).
5. What holds the skeleton together?
The skeleton is made of calcium carbonate plates held together by connective tissue and muscles. In some cases, they can lock their spines in place for protection.
6. What do sea urchins eat?
Sea urchins mostly eat algae (seaweed) and kelp. They use a special jaw structure called "Aristotle's lantern" to scrape food off rocks.
7. What do brittle stars eat?
Brittle stars are often scavengers or filter feeders. They eat small particles of food floating in the water or detritus on the sea floor.
8. Why are cucumbers called "vacuum cleaners of the deep sea"?
Sea cucumbers eat sand and mud from the ocean floor. As they digest it, they remove nutrients and organic waste, effectively cleaning the sea floor.
9. What is the name of the part of the animal that attaches to the rock?
This is usually the tube feet, which act like suction cups to hold the animal in place against waves and currents.
10. How many brittle stars live on the ocean floor?
Brittle stars are very abundant. In some areas, there can be thousands of them per square meter, making them one of the most numerous animals on the deep-sea floor.
11. How are sea urchins protected?
They are protected by long, sharp spines that cover their bodies. Some spines are venomous.
12. What is the name of the plate under water diffusion?
*(Note: This question seems to refer to the skeletal plates. The individual plates in the skin are called ossicles.)*
13. What is the scientific name for the basket star?
The scientific name for basket stars is *Gorgonocephalus*.
14. What part of the echinoderm helps take in oxygen? Water feet?
Yes, the tube feet help with gas exchange (taking in oxygen and releasing carbon dioxide), along with specialized structures called papulae (skin gills).
15. What part of the sea urchin feeds the brain?
Sea urchins do not have a centralized brain. They have a nerve ring around their mouth and nerves running into their arms/spines. So, no part feeds a "brain" because they don't have one in the traditional sense.
16. What part of the sea star’s body moves into the body of its prey?
The sea star pushes its stomach out through its mouth and into the shell of its prey (like a clam) to digest it externally.
17. How do sea cucumbers defend themselves?
Some sea cucumbers can shoot out sticky threads called Cuvierian tubules to tangle up predators. Others can expel their internal organs to distract the predator and then grow them back later.
18. How do you know if a sea cucumber is male or female?
You usually cannot tell just by looking at them. They look identical on the outside. Scientists often have to examine them under a microscope or wait for them to release eggs or sperm into the water to determine sex.
19. Explain how the good star eats a...
*(The sentence cuts off, but assuming it means "how the starfish eats"):* The starfish pries open the shell of a clam slightly using its strong tube feet. Then, it pushes its stomach out of its own mouth and into the clam's shell. The stomach releases digestive juices that turn the clam into soup, which the starfish then absorbs. Finally, it pulls its stomach back inside.
1. What type of system do echinoderms use for the vascular system?
They use a water-vascular system.
2. How does an echinoderm move?
They move using tube feet that extend from their body. These feet work like little suction cups to grip surfaces and pull the animal along.
3. What type of food do echinoderms have?
Most echinoderms eat other animals (carnivores) or dead organic matter (detritus). For example, sea stars often eat clams and oysters.
4. What percentage over 1,500 types of Echinoderms?
*(Note: The question in the image is cut off or phrased strangely, but it likely asks about the diversity or number of species. Based on general biology knowledge usually paired with this text: There are approximately 6,000 to 7,000 living species of echinoderms today. If the question refers to the text saying "over 1,500 types," it might be referring to a specific subgroup or an older statistic, but generally, they are a large phylum.)*
Now read the movie *Echinoderms Ultimate Animal* and answer the following questions:
1. What is the scientific name for a starfish?
The scientific name for the group is Asteroidea. A common specific starfish is *Asterias rubens*.
2. What happens when the urchin is turned on its side and has a deadly attack?
When a sea urchin is flipped over, it uses its tube feet and spines to flip itself back upright. It does not have a "deadly attack" in this context; it is trying to right itself.
3. Is an echinoderm’s mouth located on the top or bottom of its body?
The mouth is located on the bottom (the oral side) of the body.
4. What is the echinoderm body plan called?
It is called pentaradial symmetry (or five-part radial symmetry).
5. What holds the skeleton together?
The skeleton is made of calcium carbonate plates held together by connective tissue and muscles. In some cases, they can lock their spines in place for protection.
6. What do sea urchins eat?
Sea urchins mostly eat algae (seaweed) and kelp. They use a special jaw structure called "Aristotle's lantern" to scrape food off rocks.
7. What do brittle stars eat?
Brittle stars are often scavengers or filter feeders. They eat small particles of food floating in the water or detritus on the sea floor.
8. Why are cucumbers called "vacuum cleaners of the deep sea"?
Sea cucumbers eat sand and mud from the ocean floor. As they digest it, they remove nutrients and organic waste, effectively cleaning the sea floor.
9. What is the name of the part of the animal that attaches to the rock?
This is usually the tube feet, which act like suction cups to hold the animal in place against waves and currents.
10. How many brittle stars live on the ocean floor?
Brittle stars are very abundant. In some areas, there can be thousands of them per square meter, making them one of the most numerous animals on the deep-sea floor.
11. How are sea urchins protected?
They are protected by long, sharp spines that cover their bodies. Some spines are venomous.
12. What is the name of the plate under water diffusion?
*(Note: This question seems to refer to the skeletal plates. The individual plates in the skin are called ossicles.)*
13. What is the scientific name for the basket star?
The scientific name for basket stars is *Gorgonocephalus*.
14. What part of the echinoderm helps take in oxygen? Water feet?
Yes, the tube feet help with gas exchange (taking in oxygen and releasing carbon dioxide), along with specialized structures called papulae (skin gills).
15. What part of the sea urchin feeds the brain?
Sea urchins do not have a centralized brain. They have a nerve ring around their mouth and nerves running into their arms/spines. So, no part feeds a "brain" because they don't have one in the traditional sense.
16. What part of the sea star’s body moves into the body of its prey?
The sea star pushes its stomach out through its mouth and into the shell of its prey (like a clam) to digest it externally.
17. How do sea cucumbers defend themselves?
Some sea cucumbers can shoot out sticky threads called Cuvierian tubules to tangle up predators. Others can expel their internal organs to distract the predator and then grow them back later.
18. How do you know if a sea cucumber is male or female?
You usually cannot tell just by looking at them. They look identical on the outside. Scientists often have to examine them under a microscope or wait for them to release eggs or sperm into the water to determine sex.
19. Explain how the good star eats a...
*(The sentence cuts off, but assuming it means "how the starfish eats"):* The starfish pries open the shell of a clam slightly using its strong tube feet. Then, it pushes its stomach out of its own mouth and into the clam's shell. The stomach releases digestive juices that turn the clam into soup, which the starfish then absorbs. Finally, it pulls its stomach back inside.
Parent Tip: Review the logic above to help your child master the concept of echinoderm worksheet.
