Bulbs

• What is the main stored carbohydrate in the bulb during spring?

  Starch
• What happens to stored carbohydrates in the bulb during spring?

  They are broken down into sugars
• How do sugars move from the bulb during spring?

  Through the phloem
• What happens to the bulb as it loses stored energy in spring?

  The bulb shrinks
• Why is the bulb considered a source in spring?

  It supplies sugars for new growth
• What is the role of the bulb during summer?

  It acts as a sink
• What do fully grown leaves do during summer?

  They photosynthesize and produce sugars
• How are sugars transported back to the bulb in summer?

  Via the phloem
• What happens to sugars in the bulb during summer?

  They are converted into starch for storage
• What occurs to the bulb as it stores energy in summer?

  The bulb grows larger
• Why is the bulb considered a sink in summer?

  It receives and stores sugars
• What happens to the leaves during winter?

  They die
• What state is the bulb in during winter?

  It goes dormant and inactive
• What does the bulb do during winter?

  It sits underground with stored food
• Why is the bulb neither a source nor a sink in winter?

  It is in "storage mode"
• What are the seasonal roles of the bulb in terms of source and sink?

  • Spring: Source (supplies sugars for growth)
  • Summer: Sink (receives and stores sugars)
  • Winter: Inactive (in storage mode)