Sea-foam is developed from

Options

A. bones of octopus
B. extermal shell of cuttle fish
C. internal shell of cuttle fish
D. calcareous matter excreted by cephalopods

Answer

**Step-by-Step Solution:**

1. **Understanding Seafoam**: Seafoam, also known as ocean foam, is a type of foam that forms on the surface of seawater. It is created through agitation in the water, often caused by waves or turbulence.

2. **Formation of Seafoam**: The formation of seafoam occurs when organic matter such as proteins, lignin, and lipids dissolve in seawater. These substances contribute to the creation of bubbles and foam.

3. **Identifying Sources of Organic Matter**: To determine where seafoam is developed from, we need to identify the sources of the organic matter (proteins, lignin, and lipids).

4. **Examining Options**:
- **Option 1: Bones of Octopus**: This option is incorrect because octopuses do not have bones; they are soft-bodied animals.
- **Option 2: External Shell of Cuttlefish**: This option is also incorrect as the external shell of cuttlefish is made of aragonite, which does not contribute to seafoam.
- **Option 3: Internal Shell of Cuttlefish**: This option is correct. The internal shell of cuttlefish contains proteins, lignin, and lipids, which are essential components for the formation of seafoam.
- **Option 4: Calcareous Matter Excreted by Cephalopods**: This option is incorrect because calcareous matter primarily consists of calcium carbonate, which does not include the necessary organic components for seafoam.

5. **Conclusion**: Based on the analysis of the options, the correct answer is that seafoam is developed from the internal shell of cuttlefish, which contains proteins, lignin, and lipids.