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Trends in Economic Zoology — Bio Zoology STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11Bio ZoologyTrends in Economic Zoology3 Marks
Question
What are the various races of Bombyx mori?
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Answer

On the basis of the moults they undergo in the larval stage, B. mori is divided into three races. They are:
  1. Tri moulters – 3 moults
  2. Tetra moulters – 4 moults
  3. Penta moulters – 5 moults
  4. On the basis of voltinism (the number of broods raised per year), three kinds of races are recognised. They are:
  5. Univoltines – one brood only
  6. Bivoltines – two broods only
  7. Multivoltines – more than two broods

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