Sericulture Extension Officer • 2018 • Paper-III
If the fractions 8/5, 7/2, 9/5, 5/4, 4/5 are arranged in descending order of their values, which one will be fourth?
A)
4/5
B)
8/5
C)
9/5
D)
5/4
Values descending: 7/2, 9/5, 8/5, 5/4, 4/5; the fourth is 5/4.
Sericulture Extension Officer • 2018 • Paper-III
Look at this series: 17, 8, 18, 11, 19, 14, ... What number should come next?
A)
27
B)
20
C)
21
D)
18
Odd/even positions rise separately: 17,18,19,20 and 8,11,14.
Sericulture Extension Officer • 2018 • Paper-III
The Economic Threshold Level (ETL) of Mealy bug is
A)
10/shoot
B)
20/leaf
C)
20/plant
D)
15/leaf
The stated ETL for mealy bug in this source is 20 per plant.
Sericulture Extension Officer • 2018 • Paper-III
Look at this series: 4, 1, (1/4), (1/16), ... What number should come next?
A)
1/3
B)
1/32
C)
1/64
D)
1/128
Each term is divided by 4; 1/16÷4=1/64.
Sericulture Extension Officer • 2018 • Paper-III
Predisposing factor of muscardine disease
A)
Poor quality leaves
B)
Low temperature with high humidity
C)
Transovarian
D)
High temperature
Cool, humid conditions favor fungal muscardine.
Sericulture Extension Officer • 2018 • Paper-III
Cultural method for reducing Powdery mildew
A)
Timely utilization of leaves
B)
Intercropping
C)
Adoption of wider spacing
D)
All of these
Timely use, intercropping and wider spacing can all reduce disease pressure; the source key treats all as cultural measures.
Sericulture Extension Officer • 2018 • Paper-III
The right approach to eliminate pathogens from the rearing environment is
A)
Rearing disease resistance silkworm breed
B)
Chemotherapy
C)
Practice hygienic measures
D)
Disinfection
Disinfection directly removes/reduces environmental pathogens.
Sericulture Extension Officer • 2018 • Paper-III
A condition where bacteria multiply enormously in the blood of the larvae, pupae and moth
A)
Sotto
B)
Septicemia
C)
Polyhedral
D)
Mycosis
Septicemia is a systemic bacterial infection with bacteria multiplying in the haemolymph.
Sericulture Extension Officer • 2018 • Paper-III
Flacidity of Silkworm body is the sign of
A)
Flacherie
B)
Densonucleosis
C)
Grasserie
D)
White muscardine
Flacherie produces flaccid larvae and gut-related symptoms.
Sericulture Extension Officer • 2018 • Paper-III
Disinfection should be done__________before rearing
A)
3 days
B)
5 days
C)
2 days
D)
7 days
The standard interval in this context is about five days before rearing.
Sericulture Extension Officer • 2018 • Paper-III
Flacherie diseases was severe during
A)
April-July
B)
April-September
C)
November-April
D)
July-November
Warm, humid periods favor severe flacherie.
Sericulture Extension Officer • 2018 • Paper-III
Which of the following is not a bed disinfectant?
A)
Sanitech
B)
Labex
C)
Sericillin
D)
None of these
Sanitech and Labex are used as bed disinfectants in sericulture; Sericillin is not a bed disinfectant.
Sericulture Extension Officer • 2018 • Paper-III
Indigenous hymenopterous ecto-pupal parasitoid used to kill the uzi pupa is
A)
Nesolyx thymus
B)
Dermester ater
C)
Labia arachidis
D)
Exorista bombycis
Nesolynx thymus is an indigenous hymenopterous ecto-pupal parasitoid of uzi fly pupae.
Sericulture Extension Officer • 2018 • Paper-III
Poisonous substances entering into the silkworm through feeding, body contact etc are categorized under
A)
Chronic
B)
Infectious
C)
Non-infectious
D)
Sporadic
Poisoning is a non-infectious disorder.
Sericulture Extension Officer • 2018 • Paper-III
Ideal magnification required for the identification of pebrine spore
A)
400X
B)
600X
C)
100X
D)
10X
Routine identification of pebrine spores is performed under high-power microscopy around 400×.
Sericulture Extension Officer • 2018 • Paper-III
Common symptoms of Fungal diseases
A)
Mummified larvae
B)
Irregular size
C)
Translucent head and thorax
D)
Anal protrution
Fungal infection characteristically produces hard, mummified larvae.
Sericulture Extension Officer • 2018 • Paper-III
The fungal infection caused by Apergillus flavus in Oak Tasar silkworm is controlled mainly by
A)
5% Sulphuric acid
B)
Hygienic management
C)
10% Hydrochloric acid
D)
Maintain low temperature and high humidity
Hygiene and environmental control are the main preventive measures.
Sericulture Extension Officer • 2018 • Paper-III
Recommended dosage of disinfectant for rearing house and appliances
A)
5% bleaching powder + 0.2% slaked lime
B)
3% bleaching Powder + 0.5% slaked lime
C)
5% bleaching powder + 0.3% slaked lime
D)
2% bleaching powder +0.3% slaked lime
This combination is a standard disinfection formulation cited in sericulture manuals.
Sericulture Extension Officer • 2018 • Paper-III
To avoid formation of clumps of eggs, the loose eggs are dipped for 10 mins in
A)
2% formalin solution
B)
2% formaldehyde solution
C)
0.5% potassium carbonate solution
D)
0.5% bleaching powder solution
Potassium carbonate treatment is used to prevent egg clumping and aid preparation.
Sericulture Extension Officer • 2018 • Paper-III
Management of viral disease
A)
Rearing under congenial conditions of environment and nutrition
B)
Lowering humidity and used bed disinfectant
C)
Mother moth examination
D)
All of these
Environmental management, bed disinfection and mother-moth examination all help control viral disease incidence.
Sericulture Extension Officer • 2018 • Paper-III
Rectal protrution is the symptoms of
A)
Muscardine
B)
Flacherie
C)
Grasserie
D)
Pebrine
Rectal protrusion/diarrhoeal signs occur in flacherie.
Sericulture Extension Officer • 2018 • Paper-III
Tiger band disease in Oak Tasar Silkworm was caused by
A)
Bacteria
B)
Virus
C)
Nematode
D)
Protozoa
Tiger band disease is viral.
Sericulture Extension Officer • 2018 • Paper-III
Which is not a silkworm disease?
A)
Grasserie
B)
Powdery mildew
C)
Flacherie
D)
Muscardine
Powdery mildew is a mulberry plant disease, not a silkworm disease.
Sericulture Extension Officer • 2018 • Paper-III
Chemical used for disinfection in Sericulture
A)
Formalin
B)
Bleaching powder
C)
Slaked lime
D)
All of these
Formalin, bleaching powder and slaked lime can all be used for disinfection.
Sericulture Extension Officer • 2018 • Paper-III
Before starting Muga rearing, plantation site should be disinfect by dusting bleaching powder and lime in the ratio of
A)
1:9
B)
9:1
C)
8:2
D)
3:4
The recommended bleaching powder:lime ratio is 1:9.
