Sericulture Extension Officer • 2022 • Technical Paper-III
“Decol” a disinfectant though the prescription inscribe 1:49 (Decol:water), for Mizoram ________ solution is best practice.
A)
1:40
B)
1:30
C)
1:35
D)
1:47
In the context of Sericulture (silkworm rearing), disinfectants are used to maintain a sterile environment to prevent the outbreak of diseases like Pebrine, Flacherie, and Grasserie. Decol is a common disinfectant used in the industry. While a standard prescription might suggest a dilution of 1:49 (which is roughly a 2% solution), practical field applications in specific regions like Mizoram often require a slightly higher concentration to ensure efficacy against local environmental pathogens and humidity levels. A dilution of 1:30 (approximately 3.3%) is the recognized 'best practice' in Mizoram sericulture guidelines to ensure a more potent disinfecting action in the rearing house, making it more effective than the standard 1:49 ratio.
Sericulture Extension Officer • 2022 • Technical Paper-III
Packing the eggs tight generates ________ and results in lack of air for respiration of eggs.
A)
Carbondioxide
B)
Carbonmonoxide
C)
Heat
D)
Viruses
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
Preservation of seed cocoon in muga requires ________ and ________ relatives humidity.
A)
20°C to 25°C and 70 - 75% relative humidity
B)
20°C to 24°C and 65 - 70% relative humidity
C)
26°C to 30°C and 70 - 90% relative humidity
D)
25°C to 27°C and 65 - 85% relative humidity
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
The success of grainage depends on the ________ of desease free laying produced.
A)
Races
B)
Hybrid
C)
Quantity
D)
Quality
Grainage success depends on quality of disease-free layings produced, not just quantity.
Sericulture Extension Officer • 2022 • Technical Paper-III
________ production preceeds the industrial cocoon production.
A)
Commercial Seed Cocoon
B)
Hybrid Seed Cocoon
C)
Seed Cocoon
D)
Bivoltine Seed Cocoon
Seed cocoon production precedes industrial/commercial cocoon production in sericulture cycle
Sericulture Extension Officer • 2022 • Technical Paper-III
50 Dfls of Eri silkworm can be reared comfortably in a rearing house of ________ .
A)
30 ft × 12 ft
B)
30 ft × 15 ft
C)
24 ft × 12 ft
D)
24 ft × 15 ft
Eri rearing house 30ft×12ft (~360 sq ft) accommodates ~50 DFLs comfortably.
Sericulture Extension Officer • 2022 • Technical Paper-III
Egg laying is maximum in ________ and ________ season.
A)
Autumn and spring
B)
Summer and winter
C)
Winter and spring
D)
Summer and Autumn
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
Incubation of mulberry Dfls required _______ temperature and a relative humidity of _______.
A)
240C and 70%
B)
250C and 80%
C)
260C and 85%
D)
230C and 75%
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
Germ band formation generally takes place by ________ to ________ of egg laying of oviposition.
A)
14 to 16 hours
B)
17 to 18 hours
C)
20 to 24 hours
D)
24 to 26 hours
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
Production of Seed Cocoon which can ________ in the emergence of moth is essential for grainage programme.
A)
Interfere
B)
Convergence
C)
Contrast
D)
Synchronise
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
________ ratio of slaked lime and bleaching powder are used as disinfectant in muga prior to rearing.
A)
1:9
B)
1:7
C)
9:1
D)
7:1
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
The primitive streak depends, at the anterior end a ________ is formed where hibernating eggs undergo diapauses.
A)
Mesoderm
B)
Microphyle
C)
Cytokinesis
D)
Blastopore
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
Fumigation of grainage house of muga, ________ litre(s) of formalin and ________ grams of potassium permanganate with ________ litre(s) of water are boiled to evaporate.
A)
3 litres, 300 grams, 3 litres
B)
2 litres, 500 grams, 3 litres
C)
1 litre, 400 grams, 3 litres
D)
2 litres, 400 grams, 2 litres
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
The collection of cocoon for commercial seed in muga should be collected from
A)
P4
B)
Kharaki
C)
Bharpok
D)
Aherua
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
Muga cocoon for seed purpose must be transported preferably during night time after ________ days of harvest from cocoonage.
A)
4 to 6 days
B)
6 to 7 days
C)
7 to 8 days
D)
8 to 10 days
Muga seed cocoons transported at night 4-6 days after harvest from cocoonage to avoid heat mortality
Sericulture Extension Officer • 2022 • Technical Paper-III
The emergence of moth can be synchronised by preserving the male chrysalis at ________ to ________ temperature for 3 to 4 days.
A)
4°C to 5°C
B)
2°C to 4°C
C)
6°C to 8°C
D)
5°C to 10°C
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
Mysore races are ________ in nature.
A)
Univoltine
B)
Bivoltine
C)
Multivoltine
D)
Trivoltine
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
In muga basis seed, multiplication by Central silk board technical staff is done at ________
A)
P1
B)
P2
C)
P3
D)
P4
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
The ideal temperature and humidity required for 1stinstaneri silkworm is ________ and ________ relative humidity.
A)
25°C to 26°C and 70 - 75% R.H
B)
25°C to 26°C and 70 - 80% R.H
C)
26°C to 28°C and 80 - 90% R.H
D)
26°C to 28°C and 85 - 90% R.H
1st instar eri silkworm requires 26-28°C and 85-90% RH.
Sericulture Extension Officer • 2022 • Technical Paper-III
The disease phyllactinia corylea (Pers) karst causes ________ .
A)
Leaf spot disease
B)
Leaf rust disease
C)
Powdery mildew
D)
Bacterial blight
Phyllactinia corylea causes powdery mildew of mulberry.
Sericulture Extension Officer • 2022 • Technical Paper-III
In muga, egg laying is maximum in ________ .
A)
Autumn and spring
B)
Spring and summer
C)
Summer and Autumn
D)
After autumn and spring
Muga silkworm shows maximum oviposition in autumn and spring favorable seasons
Sericulture Extension Officer • 2022 • Technical Paper-III
The causal organism of leaf spot in muga and mulberry are:
A)
Phylostica perseae Ell & mart and Cercospera moricola.
B)
Cilletotrichum gloeosporioiedes and Cerotelium fici & Aecidium mori.
C)
Pestalotiopsis desiminata thuem and phyllactinia corylea.
D)
Ceplaleros parasticus karst and Rosselina necotrix.
Pestalotiopsis disseminata causes leaf spot/grey blight in both mulberry and muga hosts; phyllactinia causes powdery mildew.
Sericulture Extension Officer • 2022 • Technical Paper-III
The following is not included in muga grainage operation :-
A)
Selection and preservation of seed cocoon
B)
Transfer of worms by kharika
C)
Moth emergence and coupling
D)
Oviposition
Standard sericulture practice as per CSB manual.
Sericulture Extension Officer • 2022 • Technical Paper-III
________ 0.1 % is used as foliar spray to control leaf spot diseases in mulberry.
A)
Sulfex
B)
Dithane
C)
Bavistin
D)
Karathane
Bavistin (Carbendazim) 0.1% foliar spray controls leaf spot in mulberry.
Sericulture Extension Officer • 2022 • Technical Paper-III
Microscope used for detection of pebrine should have a magnification of atleast ________ time magnification.
A)
500
B)
600
C)
300
D)
400
Standard sericulture practice as per CSB manual.
