Question

Which one of these protozoans is a threat to apiculture and sericulture?
A. Eimeria
B. Ceratium
C. Nosema
D. Monocystis

Answer 1

Hint: Sericulture is the rearing of silkworms to get silk. throughout a stage of its life cycle, the silkworm weaves a net around itself and so silk is obtained from that net. cultivation could be a technique of growing or keeping bees in hives on a giant scale for the aim of extraction of honey and wax.

Complete answer: Apiculture refers to the culture of honey bees whereas sericulture refers to the culture of silkworms.
Nosema was discovered by Pasteur (1865) inflicting chronic disease pebrine in silkworms and Nosema malady in honeybees. So, Nosema could be a threat to cultivation and sericulture.

Hence, option C) is the correct answer.

Additional information: Nosemosis of European honey bees (Apis mellifera) is present in bee colonies worldwide. Till recently, the Nosema arthropod genus had been considered the responsible agent of the unwellness, that causes serious economic losses in apiculture. Nosema ceranae is a rising sporozoan parasite of European honeybees, A. mellifera, however, its distribution isn't well known. Previously, Nosemosis in honeybees in the Asian country was attributed completely to N. apis.
The symptoms of Nosema are comparatively nonspecific, which makes it tough to differentiate from different diseases of the bee. It arises principally within the spring when periods of weather, though it should even be a winter sickness that's solely noticed within the spring once beekeepers first examine their hives.

Note: Nosema apis may be a one-celled parasite of the western honey bee (Apis mellifera). The species is of the category Microsporidia, which were antecedently thought to be protozoans, however, are currently classified as fungi or fungi-related. Microsporidia area unit intracellular parasites and that they infect the animal tissue cells of the midgut.