The Benefits of Closing Spiracles for Terrestrial Centipedes
How would a terrestrial centipede most likely benefit from the ability to close its spiracles?
Closing spiracles would ________.
A) allow the centipede to move more quickly
B) allow the centipede to retain more moisture in its tissues
C) allow the centipede to stay warmer
D) allow more oxygen from the environment to reach the centipede's tissues
E) not benefit the centipede at all
Final answer:Answer:
The ability to close spiracles allows a terrestrial centipede to retain more moisture in its tissues by preventing desiccation. This adaptation is crucial for moisture conservation in arthropods living in dry environments. Closing the spiracles of a terrestrial centipede would allow it to retain more moisture in its tissues. So, the correct option is option b.
The question examines how a terrestrial centipede could benefit from the ability to close its spiracles. Closing spiracles would primarily allow the centipede to retain more moisture in its tissues. This mechanism is fundamental for terrestrial arthropods as it helps to prevent desiccation (drying out), which is a key advantage provided by their exoskeleton. In addition, the closure of spiracles can limit water loss in these organisms' tracheal respiratory systems, which are specialized for gas exchange in a terrestrial environment.
It is important to note that the spiracles, which are openings along the thorax and abdomen of an insect's body, are connected to a tubular network that allows oxygen to pass into the body and aids in the regulation of the diffusion of CO2 and water vapor. Thus, the closing of spiracles can conserve water while still allowing for sufficient gas exchange when they are opened again.
Given the importance of water conservation for terrestrial arthropods, such as centipedes, which have adapted to life on land, the ability to close spiracles serves a crucial role in their survival by mitigating water loss in dry environments. The ability to close spiracles does not contribute to their speed, warmth, or direct oxygen acquisition, but it does significantly bolster their moisture conservation abilities.