The headings complete the table are X = waxes and Y = sterols; option A.
What are lipids?
Lipids are fatty, oily, or waxy water-insoluble substances found in living organisms.
Lipids are of many classes and types and they perform several functions in the body.
Some classification of lipids are given below:
Waxes:
- prevent dehydration of plants
- are a protective layer on hair or feathers
- are tightly packed fatty acid chains joined to long-chain alcohols
Sterols:
- are found in cell membranes of plant and animal cells
- consist of four carbon rings with no fatty acids
- serve a role in aiding fat digestion
In conclusion, lipids are important biomolecules found in the body.
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