Sericulture Old Questions Papers

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Old Questions Papers on Sericulture

1. Silkworms are fond of dim light
(a) 15-20 lux
(b) 15-30 lux
(c) 10-30 lux
(d) 20-30 lux

2. Silkworm settle for first moults in _____________ from the date of brushing
(a) 4 days
(b) 2 days
(c) 3 days
(d) 4-5 days

3. What is the best method of late age rearing
(a) Box rearing
(b) Shoot rearing
(c) Stand rearing
(d) All of these

4. When the temperature is _____________ the spinning process is slow.
(a) Lower than 20°C
(b) Below 30°C
(c) Between 25°-27°C
(d) Lower than 25°C

5. The urine excreted by the larvae increases the _____________ of the rearing bed.
(a) Temperature
(b) Humidity
(c) Air current
(d) Both (a) & (b)

6. Highest ripening day of mature worms in Muga Rearing is
(a) Bhorpak
(b) Jhali
(c) Kharika
(d) Chaloni

7. Muga worms should be transferred from one plant to another even when there is still _____________ foliage on plants to avoid starvation
(a) 10%
(b) 30%
(c) 25%
(d) 20%

8. Jhali is used for _____________ of muga silkworm.
(a) Transfer of worms
(b) Mounting
(c) Egg laying
(d) Bed cleaning

9. In Oak Tasar culture, worms are reared in indoor for
(a) 5-10 days
(b) 10 days
(c) 10-12 days
(d) None of these

10. Which is not a part of silkworm egg?
(a) Chorion
(b) Yolk
(c) Spinneret
(d) Vitelline membrane

11. Hormone produced by corpus allatum in silkworm is
(a) Juvenile hormone
(b) Ecdysone hormone
(c) Diapauses hormone
(d) None of these

12. The number of spiracles in silkworm larvae is
(a) 7 pairs
(b) 6 pairs
(c) 10 pairs
(d) 9 pairs

13. The abdominal segments of a silkworm larva has
(a) 3 segment
(b) 6 segment
(c) 11 segment
(d) 9 segment

14. The diapausing stage in the life cycle of Bombyx mori is
(a) Egg
(b) Pupa
(c) Larva
(d) Moth

15. Ideal temperature and humidity required for preservation of seed cocoon is
(a) 25oC and 70-80%RH
(b) 20oC and 90%RH
(c) 14±1oC and 60%RH
(d) 10±2oC and 65%RH

16. Female pupae can be identified by
(a) Small spot on the ventral surface of 9th abdominal segment
(b) Small body structure
(c) X-shaped mark in the centre of 8th abdominal segment
(d) Narrow slit on the abdomen

17. When moths are allowed to emerge in a natural way a kind of digestive fluid secreted is known as
(a) Scricin
(b) Morin
(c) Proline
(d) Cocoonase

18. What is the valve which regulates the passage of food from foregut to the midgut and prevents regurgitation?
(a) Pyloric valve
(b) Cardiac valve
(c) Spiracles
(d) Spinneret

19. External openings of the respiratory system in Bombyx mori are known as
(a) Ostia
(b) Rectum
(c) Spiracles
(d) Spinneret

20. The female silkworm larvae can be identified by the presence of
(a) Silk glands
(b) Scent gland
(c) Ischiwatta’s gland
(d) Herold glands

21. Which portion of the silk gland secretes fibrion
(a) Anterior region
(b) Middle region
(c) Middle section of middle region
(d) Posterior region

22. Filippi’s or Lyonnet’s gland is found in
(a) Silk gland
(b) Digestive system
(c) Excretory system
(d) Respiratory system

23. The larval duration of Oak Tasar silkworm is
(a) 30-35 days
(b) 10-11 days
(c) 20-25 days
(d) 40 days

24. Muga silkworm belongs to the genus
(a) Antheraea
(b) Philosomia
(c) Eriogyna
(d) None of these

25. Tubercles colour of 3rd instar Muga silkworm is
(a) Blue
(b) Pale yellow
(c) Violet
(d) Brick-red

26. The scientific name of Oak Tasar silkworm is
(a) Antheraea proylei
(b) Antheraea assama
(c) Bombyx mori
(d) Quercus acutissima

27. Voltinism referred on the basis of
(a) Geographical distribution
(b) Number of larval moulting
(c) Number of generation per year
(d) None of these

28. Where do you find diapausing eggs of silkworm?
(a) Tasar
(b) Muga
(c) Eri
(d) Mulberry

29. The process of casting off exoskeleton in silkworm is called
(a) Moulting
(b) Mounting
(c) Mulching
(d) Brushing

30. Diploid number of chromosomes in somatic cells of Bombyx mori is
(a) 28
(b) 56
(c) 84
(d) 112

31. The gene responsible for producing the moulting hormone ecdysone was located on
(a) 6 chromosome
(b) 10 chromosome
(c) 8 chromosome
(d) 7 chromosome

32. The female sex chromosome in Bombyx mori is
(a) ZZ
(b) XY
(c) ZW
(d) XX

33. List of sex limited breeds in India by hybridization is
(a) ZPN (SL), CSR3, CSR8
(b) MC4, CSR2, CSR4
(c) CSR4, CSR3, NB4D2
(d) CSR2, CSR8, ZPN (SL)

34. Female cocoon colour of sex limited breed CSR8 is
(a) White
(b) Yellow
(c) Green
(d) Pink

35. In silkworm the major gene for resistance to B. bassiana pathogen is located on the
(a) 7th and 11th chromosome
(b) 9th and 10th chromosome
(c) 7th and 8th chromosome
(d) 10th chromosome

36. The duration of light and darkness to be provided during incubation of silkworm egg is
(a) 8 hours light and 16 hours darkness
(b) 14 hours light and 7 hours darkness
(c) 12 hours light and 8 hours darkness
(d) 16 hours light and 8 hours darkness

37. Black boxing of silkworm eggs during incubation is done for
(a) 48-72 hrs
(b) Synchronized hatching
(c) Uniform growth of larvae
(d) All of these

38. Requirement of temperature and relative humidity conditions for Chawki rearing are
(a) 25oC and 60-70%RH
(b) 26-28oC and 80-85%RH
(c) 25-26oC and 85-95%RH
(d) 25-30oC and 80-85%RH

39. The larval stage of Bombyx mori passes through _________ number of moults before spinning of cocoons
(a) Three
(b) Four
(c) Five
(d) None of these

40. The ideal time for brushing of silkworm is
(a) 7 A.M
(b) 9 A.M
(c) 7-8 A.M
(d) 10 A.M

41. What is the minimum gap required between two consecutive rearing?
(a) 5 days
(b) 25 days
(c) 10 days
(d) 1 month

42. The success of silkworm rearing mainly depends on
(a) Good quality leaves
(b) Brushing
(c) Mounting
(d) None of these

43. Photoecdysone (Plant extract) is a hormone used for
(a) Uniform mounting and ripening
(b) Foliar spray for mulberry
(c) Bed disinfectants to prevent silkworm disease
(d) None of these

44. The frequency of feeding of silkworm is
(a) 3 feeding/day
(b) 5 feeding/day
(c) 4 feeding/day
(d) 6 feeding/day

45. Bed disinfectant should be applied
(a) During moulting
(b) 30 minutes before feeding
(c) 1 hour before feeding
(d) 30 minutes after feeding

46. How many plastic tray are required for rearing of 100 dfls of mulberry silkworm eggs?
(a) 120
(b) 150
(c) 80
(d) 100

47. A silkworm completes spinning of cocoon within
(a) 2-3 days
(b) 5-6 days
(c) 4-5 days
(d) 1-2 days

48. One plastic collapsible mountage can accommodate
(a) 200 larvae
(b) 350-400 larvae
(c) 1200 larvae
(d) 80-150 larvae

49. Ideal temperature and relative humidity required during spinning are _________ respectively.
(a) 25-27oC and 60-70%RH
(b) 24-25oC and 70-80%RH
(c) 26-27oC and 60-70%RH
(d) 26oC and 55-65%RH

50. No. of cocoon in 1kg is 560. Pierce cocoon-5, double cocoon-15, flimsy cocoon-8, malformed cocoon-4. Calculate the good cocoon percentage.
(a) 5.7%
(b) 90.4%
(c) 85%
(d) 94.3%