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Question
Starfishes crawl by means of
Starfishes crawl by means of
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Solution
The correct option is C Tube feet
- In order to walk on surfaces, the water stored in the radial canals of the starfish is controlled by valves that lead to the hundreds of tube feet. These valves are known as ampullae. They create pressure by contracting and resting. To extend a tube foot, ampulla contracts, increasing the pressure around that tube foot.
- When the ampulla releases pressure, a tube foot is withdrawn back toward the starfish's body. By controlling tube feet in a wavelike motion, releasing and contracting the tube feet in a series, a starfish can grip and walk along surfaces. Some species of starfish, like the northern sea star, can travel a mile in one week.
- Starfish also depend on their tube feet suckers to hold them in place when currents are strong. Starfish also depend on their tube feet to feed. The suckers on their tube feet are especially important.
- In order to walk on surfaces, the water stored in the radial canals of the starfish is controlled by valves that lead to the hundreds of tube feet. These valves are known as ampullae. They create pressure by contracting and resting. To extend a tube foot, ampulla contracts, increasing the pressure around that tube foot.
- When the ampulla releases pressure, a tube foot is withdrawn back toward the starfish's body. By controlling tube feet in a wavelike motion, releasing and contracting the tube feet in a series, a starfish can grip and walk along surfaces. Some species of starfish, like the northern sea star, can travel a mile in one week.
- Starfish also depend on their tube feet suckers to hold them in place when currents are strong. Starfish also depend on their tube feet to feed. The suckers on their tube feet are especially important.
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