Topic 2 Plants: Leaf Structures

Question 1

• Covered by epidermal layer, covered by a waxy cuticle

Answer 1

Leaf Covering

Question 2

• In lower epidermis
• Opens and closes allowing for gas exchange
• Open when CO2 concentration is low (allows for CO2 intake and photosynthesis)
• Closed when CO2 concentrations are high and when temps are high (prevents water loss via transpiration)
• A balance must exist between opening stomata for food production via photosynthesis and closing stomata to prevent water loss (desiccation)

Answer 2

Stomata

Question 3

• Water influx to guard cells makes them turgid, opening the stomata

Answer 3

Guard Cells

Question 4

• Between upper and lower epidermis

Answer 4

Mesophyll

Question 5

a. Palisade mesophyll

b. Spongy mesophyll

Answer 5

Types of Mesophyll

Question 6

• Closer to upper epidermis, tightly packed cells that carry out photosynthesis

Answer 6

Palisade mesophyll

Question 7

• Closer to lower epidermis, loosely packed allowing for gas exchange

Answer 7

Spongy mesophyll

Question 8

• Surround and protect the vascular bundle

Answer 8

Bundle Sheath Cells