food

• Why has wood been important to humankind since the dawn of civilization?

  It has contributed to the advancement of civilization through construction and tool-making
• What are some uses of unprocessed wood?

  It can be used in the form of lumber for heavy construction
• What qualities make wood a preferred construction material?

  High strength, lightweight, easy availability, continuous supply, and high resistance to electrical and chemical stimuli
• What are the essential requirements of good structural timbers?

  Strength, durability, toughness, resistance to stress, and easy workability
• Which types of trees mainly provide structural timbers?

  Softwoods and the heart of the tree
• Name two valuable timber yielding plants of Myanmar.


  Teak (*Tectona grandis*) and Pyinkado (*Xylia dolabriformis*)
• What is the significance of life on Earth in relation to the sun?

  Life on Earth depends on the sun
• What is sericulture?


  It is the rearing of silkworm moths for the production of raw silk
• What is silk often referred to as?

  The "Queen of Textiles"
• Why is silk considered one of the most expensive fibers?

  Due to its cost and the tedious production process
• Which countries are the main producers of silk?

  China and India
• What is the primary use of wool?


  It is used for clothing and various textile products
• What are the main components of wool?

  Protein and a small percentage of lipids
• What factors determine the quality of wool?

  Fibre diameter, crimp, yield, color, and staple strength
• What is the global industry for wool primarily found?


  Australia, Argentina, the United States, and New Zealand
• What are the main types of plant fibers used for clothing?

  • Cotton (*Gossypium* spp.*)
  • Jute (*Corchorus* spp.*)
  • Linen
  • Nylon
  • Polyester
• What is the role of sericulture in rural economies?

  It plays a major role in rural employment, poverty alleviation, and earning foreign exchange
• What are the four stages in the life cycle of a silkworm?

  Egg, caterpillar (larva), pupa, and adult moth
• What do silkworms primarily eat?

  Mulberry leaves
• Why is the cultivation of mulberry trees important for silk production?

  They are the specific food source for silkworms