Question

Oak Tassar silkworm is
A. Bombyx mori
B. Antheraea ricini
C. Antheraea assama
D. Antheraea roylei, A. pernyi

Answer 1

Hint: Tassar silk is a non-mulberry silk as Antheraea species of silkworms obtain tassar silk. Their caterpillars feed on the leaves of the oak plants.

Complete answer:
To answer this question, we should know the scientific name of the Oak Tassar silkworm.
To start with, let’s discuss silkworms. These insects are the source of the silk fibers. Therefore, silk fiber is an animal fiber. When silkworms are reared for obtaining silk fibers, it is called sericulture. Their common life cycle includes the hatching of eggs to release larvae called caterpillars or silkworms. The caterpillars mostly feed on the leaves of their preferred plant species and gradually develop into a pupa. Transformation of caterpillars into the pupa includes the secretion of a protein fiber around them that serves as the source of silk.
Now, we should know that silk fibers are obtained from the different species of silkworms which is why silk fibers are of different varieties. For example, the softest and lustrous silk is obtained from Bombyx mori. It is the silk moth whose primary food plant is the mulberry. Likewise, Antheraea ricini is also called eri silkworm and is the source of eri silk. Its primary food plant is Ricinus (castor-oil plant). Antheraea assama is a muga silkworm. Its caterpillars feed on the leaves of Litsea polyantha, L. citrate, and Machilus bombycina.
Now, it is clear that oak tassar silkworm is a species that obtains tassar silk. Antheraea pernyi is also called oak tassar silkworm. It is known to have evolved from Antheraea roylei . The main food plant of these silkworms is the oak plant (Quercus).

So, the correct answer is D. Antheraea roylei, A. pernyi

Note: There are many things that a student needs to know to understand this question and the given options. First, GnRH is a gonadotropin-releasing hormone. It triggers the anterior pituitary to secrete FSH and LH. FSH and LH are together called gonadotropins since they target gonads (testes and ovaries) in both males and females. Estrogen alone exerts positive feedback on the secretion of FSH and LH and causes LH surge by the mid-follicular phase. However, the higher levels of progesterone and estrogen together inhibit the secretion of these hormones.