(d) Pearl is not obtained from insects. A pearl is a hard glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusc or another animal, such as a conulariid. Silk is a natural protein fibre, some forms of which can be woven into textiles.The protein fibre of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. Bees produce honey from the sugary secretions of plants or from secretions of other insects such as honeydew. Lac is the scarlet resinous secretion of a number of species of lac insects, of which the most commonly cultivated is Kerria lacca.