Stems And Leaves Flashcards
Above ground portion of plant
Includes stems, leaves, buds, flowers and fruits
Shoot
Site of food production
Leaves
Its function is conduction and support
Stems
Initiated in embryo from epicotyl
Shoot development
Where leaves arise; point of growth along a twig
Nodes
Interval between nodes
Internodes
Buds along the side; aka lateral buds
Axillary
Buds at the end of twig
Terminal buds
It determines age of twig
Bud scale scar
Functions of stem
Support, produce carbohydrates, store materials, transport water
Types of stems
Herbaceous, woody, caulescent, acaulescent, aerial (erect, prostrate, decumbent, caespitose, scandent, scampose), underground
Type of stem that is soft green and short lived ex: tomato
Herbaceous
Type of stem that’s hard brown and long lived
Woody
Type of stem w/ nodes and internodes
Caulescent
Type of stem with compressed indistinguishable nodes and internodes. Looks stemless. ex: lettuce
Acaulescent
Type of stem that has a normal growth under the sun
Erect
Horizontal shoot flushed to the ground
Prostrate
Horizontal shoot that’s not flushed to the ground
Decumbent
Twining stem; vine like (ex: ampalaya)
Scandent
Acaulescent inerect leafless flowering stalk
Scapose
Underground stems; are also modified stems for storage
Rhizome, tuber, corm
Underground stem that is horizontal, elongated often thick and fleshy
Rhizome
Like a rhizome but compressed and enlarged
Tuber
Underground stem that’s vertical compressed
Corm
Product of apical meristem including dermal ground and vascular tissues
Primary stem
Modified stem that reproduces asexually
Stolon/Runner
Modified stem that is for support
Tendrils
Modified stem that looks like leaf
Cladophylls
Modified stem that is for protection
Thorn
Modified stem that contain water
Succulent
Reservoir of food
Phelloderm
Part of periderm that is for gas exhange
Lenticel
Leaves function
Solar energy and CO2 collector
Origin of leaves
Leaf primordium of shoot apex
External anatomy of leaves
Blade (lamina), margin (edge), veins, petiole, stipules (2 appendages that serves for protection)
Type of stem that produces multiple shoots, forming tufts or cushions
Caespitose
Two appendages at the base of the petioles
Stipule
3 main tissues of of primary meristem
Epidermis, ground tissue, vascular bundle
Arrangement of leaves; purpose: for all leave to get sun light
Phyllotaxy
All plants have ____ growth
Primary
Different phyllotaxy of leaves
Opposite, alternate, whorled, basal, distichous, decussate
Only ______ can have secondary growth
Eudicots
Two types of leaves
Simple and compound
Secondary growth is responsible for ________
Increase in girth, size and volume, woodiness
Leaf type that has an undivided blade with a single axillary bud at the base of the petiole
Simple
_______ never have secondary growth
Leaves
Divided into leaflets that lack an auxiliary bud but each has a single bud at the base of the petiole
Compound
Outer edge
Exogenous
Lateral root
Endogenous
Type of compound leaf; PAIRS attached along a circle rachis
Pinnately compound
Type of compound leaf; leaflets attached at same point at end of petiole
Palmately compound
Another type of leaf where petioles are in the middle of the blade
Peltate
Leaves are pierced by stems
Perfoliate
Arrangement of veins
Venation
Has one or few prominent midveins from w/c smaller veins branch; dicots
Netted or reticulate
Two types of netted vein
Pinnately (main vein/midrib) or palmately veined (veins radicate out of base)
Type of venation common to monocots
Parallel venation
Venation whete there is no midrib; individual veins fork out of base; fanshaped
Dichotomous
Internal anatomy of vein
Upper epidermis, palisade parenchyma, spongy parenchyma, lower epidermis
Leaf where 2 sides are different
Bifacial
Leaf where two sides are mirror images
Unifacial
Cells that are bigger and have a special purpose
Buliform cells
Modified leaves
Tendrils, shade leaves, drought resistant, prickles and thorns, storage/succulent, reproductive, insect trapping, bracts, window leaves, false stem leaves, flowerpot leaves
Modified leaves that allow plant to cling; for support; reduced in size
Tendrils
Modified leaves that are thinner, have fewer hairs and are LARGE
Shade
Modified leaves that have thick sunken stomata
Drought resistant
Modified leaves that are epidermal outgrowths and are hypodermic trichomes
Thorns
Retain water
Storage/succulent
Modified leaves that have plantlets arising at its margin
Reproductive
Insect trapping leaves
Venus fly trap or pitcher plants
Modified leaves that are petal like
Bracts
Modified leaves that are buried in soul with transparent part exposed to light; also reduce water loss
Window leaves
Pseudo stem
False stem leaves
Modified leaves that catch water and debris for nutrient collection
Flowerpot