Ch:7 Leaves - Coggle Diagram
Morphology and Anatomy of Other Leaf Types
thick and fleshy leaves
few air spaces in mesophyll
photosynthesis occurs in deeply than foliage leaves
Sclerophyllous Foliage Leaves
Soft, flexible and edible
must produce more sugars by photosynthesis
Lithops, Senecio rotundifolia
Leaves of Conifers
leaves are sclerophyll
has thick cuticle, thick walls on epidermis and hypodermic.
leaves are perennial
vascular bundles can produce new phloem but not xylem.
dormant shoot apical meristem is protected from low temperature
small and rarely compound
tougher and waxier
two types of leaves
green cactus body
moist, has water, photosynthesis
axillary buds: spines
coils when encountered with object
For ex: pea plant, cucumber plant.
External Structure of Foliage leaves
light harvesting portion
dorsal surface has larger veins
ventral surface is usually smooth.
holds blade out to the light.
if long narrow leaf, no petiolate. EX:
blase in one part only
blade divided into several parts
found in edict and angiosperm
has one large vein
found in monocot
Internal Structure of Foliage Leaves
waterproof and translucent
allows entry for carbon dioxide
Has stomata, gaurd cells, trichomes.
interior to leaf epidermis
lower portion of cell has spongy mesophyll
between palisade parenchyma and spongy mesophyll
has mid rib and branches out as lateral veins and minor veins
transition between stem and lamina
mesophyll is rather like cortex.
two small falls like structure
Leaves with Kranz Anatomy
lack palisade parenchyma and spongy mesophyll
plants growing in nitrates and ammonia poor habitat
moves during capture
For Ex: leaves of sundew
does not move during capture
Initiation and development of leaves
Basal Angoisperm and eudicots
leaves produced from shoot apical meristem
dormant in perennial plants
developed from shoot meristem
primordium surrounds the shoot apical meristem
protoxylem and protophloem is stretched.
involved in photosynthesis
provide protection, support, storage, nitrogen procurement.