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Chapter 35: Problem 5

Identify the functions performed by the cilia on a free-swimming trochophore.

Short Answer

Expert verified
Cilia in trochophores facilitate movement and help capture food for feeding.

Step by step solution

01

Understanding Cilia

Cilia are hair-like structures on the surface of many animal cells. In the context of trochophores, cilia play a crucial role in their movement and feeding. A trochophore is a larval stage in certain invertebrates, characterized by its uniquely arranged cilia.
02

Role in Locomotion

The cilia beat in coordinated waves, allowing the trochophore to swim through the water. This movement is essential for the larva to navigate its environment, find food, and avoid predators.
03

Role in Feeding

Cilia also aid in feeding by directing food particles towards the larva's mouth. The coordinated beating of cilia creates water currents that facilitate the capture and ingestion of food particles suspended in the water.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Cilia Locomotion
Cilia play a critical role in the locomotion of a trochophore larva. These tiny hair-like structures cover the surface of the larva and move in a coordinated fashion, producing wave-like movements that propel the organism forward. This coordinated movement is crucial for the trochophore to swim effectively through its aquatic environment.
The ability to move is not only vital for reaching food sources but also for evading potential threats.
  • Cilia beat in a rhythmic pattern to ensure smooth locomotion.
  • Through their synchronized movement, the larva can control its direction and speed.
  • The effective use of cilia for swimming helps the trochophore explore various nutritional habitats and sustain its growth.
By harnessing the power of cilia movement, trochophores exhibit a remarkable ability to maneuver in their early life stages.
Cilia Feeding Mechanism
In addition to locomotion, cilia are essential for the feeding process of a trochophore. These structures work together to create water currents that help in gathering food particles floating in the surrounding water. The intricate beating of the cilia directs tiny particles, such as plankton, towards the mouth of the larva for consumption.
The efficiency of the ciliary feeding mechanism ensures that the trochophore consistently secures the necessary nutrients.
  • Water currents generated by cilia are pivotal for bringing food particles closer.
  • The collected particles are funneled towards the larva's digestive system.
  • This process allows the trochophore to maximize nutrient intake for growth and development.
Thus, cilia serve both a locomotive and a nutritional function, playing a critical role in the trochophore's development.
Invertebrate Larval Stages
The trochophore is one of the many unique invertebrate larval stages, providing insight into the early development of certain marine organisms. These stages are critical as they represent a time of transformation and growth before reaching maturity.
Trochophores are typically seen in species such as mollusks and annelids and are recognized by their cilia-covered bodies.
  • The larval stage allows for dispersal, increasing genetic diversity and colonizing new areas.
  • Each stage in development involves specialization for certain functions like feeding and movement.
  • Understanding trochophores gives insight into evolutionary adaptations and survival mechanisms.
Through studying these larval stages, scientists gain valuable knowledge about the life cycles and ecological roles of invertebrate species.

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