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Structuring your answer
• Understand the question and what exactly it is
asking
• Define any term in the question before getting
into body of the answer. (if applicable)
• Present your answer in points (unless told
otherwise)
• Points should be self explanatory or otherwise
add a line or two clear things.
• Draw neat labeled figures/diagrams ( as far as
applicable)
• A cocoon is a natural silk composite with a non-
woven structure made of continuous silk fibers. (
joined together by sericin bonding matrix.)
• Cocoon is formed from secretion from silk
gland/salivary gland of silkworm. The larva
moves the head from side to side very rapidly
about 65 times/minute and throw out secretions
from silk gland in the form of thread. This clear,
viscous fluid secretion on exposure to air gets
hardened into fine silk fibre.
Characteristics of cocoon is discussed
In the points below:
A. Physical properties
1. Color: Yellow, brown, green or grey.
2. Length: The filament forming a cocoon is 700-1100
meters long
3. Specific gravity: 1.25 to 1.34
4. It is made up of two protein:
inner core: fibroin
outer core: sericin
@ inner-fibre---outer—seri
5. Non-conductor of electricity: It is why it can be used
as an insulator. Hence suitable for both summer &
winter.
4. Moisture retention: 11-35%.
5. strength is high, is elastic fiber.
6. Density is low: thus light and comfortable
clothing made from it.
7. Luster: Bright
8. Effect of heat: can withstand 140-170 C
B. Chemical properties
1. With acid: Decomposed by strong acids into
amino acids. Dilute acid cause no effect.
2. With alkali: Only affected by very strong
alkali.
3. With organic solvent: insoluble

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Characteristics of cocoon

  • 1.
  • 2. Structuring your answer • Understand the question and what exactly it is asking • Define any term in the question before getting into body of the answer. (if applicable) • Present your answer in points (unless told otherwise) • Points should be self explanatory or otherwise add a line or two clear things. • Draw neat labeled figures/diagrams ( as far as applicable)
  • 3. • A cocoon is a natural silk composite with a non- woven structure made of continuous silk fibers. ( joined together by sericin bonding matrix.) • Cocoon is formed from secretion from silk gland/salivary gland of silkworm. The larva moves the head from side to side very rapidly about 65 times/minute and throw out secretions from silk gland in the form of thread. This clear, viscous fluid secretion on exposure to air gets hardened into fine silk fibre.
  • 4. Characteristics of cocoon is discussed In the points below: A. Physical properties 1. Color: Yellow, brown, green or grey. 2. Length: The filament forming a cocoon is 700-1100 meters long 3. Specific gravity: 1.25 to 1.34 4. It is made up of two protein: inner core: fibroin outer core: sericin @ inner-fibre---outer—seri 5. Non-conductor of electricity: It is why it can be used as an insulator. Hence suitable for both summer & winter.
  • 5. 4. Moisture retention: 11-35%. 5. strength is high, is elastic fiber. 6. Density is low: thus light and comfortable clothing made from it. 7. Luster: Bright 8. Effect of heat: can withstand 140-170 C
  • 6. B. Chemical properties 1. With acid: Decomposed by strong acids into amino acids. Dilute acid cause no effect. 2. With alkali: Only affected by very strong alkali. 3. With organic solvent: insoluble