1.5.3 Leaf Structure

• What is the function of stomata in a leaf?

  Allows CO₂ in and O₂ out
• What is the broad, flat part of the leaf called?

  Leaf blade
• Stomata in the leaf allow CO₂ to enter and O₂ to exit.
• Stomata in the leaf allow oxygen to exit.


  True
• The leaf blade is the primary site of photosynthesis.


  True
• The petiole connects the leaf to the stem.
• What is the function of air spaces in the spongy mesophyll?

  Efficient gas exchange
• What does xylem transport from the roots to the leaf?

  Water and minerals
• The stalk that connects the leaf to the stem is called the petiole.


  True
• What is the function of the epidermis in a leaf?

  Protect and prevent water loss
• What does the petiole do in a leaf?

  Supports and positions the leaf
• Which leaf part protects the leaf surface and prevents water loss?

  Epidermis
• The mesophyll consists of two distinct layers: palisade and spongy mesophyll.

  True
• Xylem in the vascular bundles transports water and minerals.


  True
• The cuticle is a waxy layer that prevents excessive water loss from the leaf.


  True
• The leaf blade is the primary site of photosynthesis.

  True
• The main vein transports water and nutrients in the leaf blade.


  True
• Which mesophyll layer contains tightly packed, column-like cells with many chloroplasts?

  Palisade mesophyll
• The phloem transports glucose and organic nutrients out of the leaf.
• What happens to gas exchange when stomata are open?

  CO₂ enters, O₂ exits
• Which part of the leaf contains chloroplasts for photosynthesis?

  Mesophyll
• What is the role of vascular bundles in the leaf?

  Transports water and nutrients
• Match the vascular component with its function:

  Xylem ↔️ Transports water and minerals

  Phloem ↔️ Transports glucose
• Which vein runs along the center of the leaf blade?

  Main vein
• What is the role of the mesophyll in a leaf?

  Photosynthesis
• The external structures of a leaf ensure efficient photosynthesis.
• What do vascular bundles transport in a leaf?

  Water, nutrients, and sugars
• What type of cells are found in the palisade mesophyll layer?

  Tightly packed, column-like cells
• Phloem in the vascular bundles transports glucose and other organic nutrients.
• Match the leaf epidermis component with its function:

  Epidermis ↔️ Protects the leaf from damage

  Cuticle ↔️ Prevents water loss

  Epidermal Cells ↔️ Allow light penetration
• What is the function of the petiole in a leaf?

  Supports and positions the leaf
• What is the role of minor veins in a leaf?

  Distributes water and nutrients
• The spongy mesophyll has air spaces that allow efficient gas exchange.


  True
• What is the function of the cuticle in a leaf?

  Prevents water loss
• The opening and closing of stomata minimize water loss through transpiration.
• Vascular bundles transport water and nutrients into the leaf and sugars out of the leaf.
• The mesophyll contains chloroplasts where photosynthesis occurs.
• The primary site of photosynthesis in a leaf is the leaf blade
• The mesophyll is the internal tissue of the leaf where photosynthesis takes place.
• What does the xylem transport in the vascular system of a leaf?

  Water and minerals