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Chapter 16: Problem 22

What are spicules? Where are they found? How can you observe them? What causes them?

Short Answer

Expert verified
Spicules are small, structural elements found in sponges, composed of calcium carbonate or silica. They can be observed under a microscope after extraction from the organism. Their formation is a biological process conducted by specialized cells in response to genetic and environmental factors.

Step by step solution

01

Definition of Spicules

Spicules are small, needle-like pieces typically composed of calcium carbonate or silica. They function as structural elements in various marine and freshwater organisms, especially sponges, providing them with support.
02

Location of Spicules

Spicules are mainly found in various marine and freshwater organisms, predominantly in sponges. They're embedded within the sponge’s body.
03

Observing Spicules

Observation of spicules requires a microscope due to their small size. They are usually extracted from the organism's body and studied under light or scanning electron microscopy to appreciate their unique shapes and patterns.
04

Cause of Spicules

The formation of spicules is a biological process occurring in the organism. In sponges, specialized cells called sclerocytes secrete the materials that form spicules. The formation is influenced by genetic factors and environmental conditions.

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