1. Root
Types of Roots:
o Taproot (dicots)
o Fibrous root (monocots)
o Adventitious root (develop from parts other than radicle)
Regions of Root:
o Root cap
o Region of meristematic activity
o Region of elongation
o Region of maturation
Modifications of Root:
o Storage roots: Carrot, sweet potato
o Respiratory roots: Mangroves
o Prop roots: Banyan tree
o Stilt roots: Maize
2. Stem
Characteristics: Arises from the plumule, bears branches, leaves, flowers, and fruits.
Modifications of Stem:
o Storage: Potato (tuber), ginger (rhizome), turmeric (rhizome)
o Support: Tendrils in grapes, gourds
o Protection: Thorns in citrus, bougainvillea
o Photosynthesis: Opuntia (flattened stems), Euphorbia (cylindrical stems)
3. Leaf
Parts of a Leaf: Leaf base, petiole, lamina.
Venation:
o Reticulate: Network-like veins (dicots)
o Parallel: Parallel veins (monocots)
Types of Leaves:
o Simple: Single undivided lamina
o Compound: Divided lamina (pinnately or palmately compound)
Phyllotaxy: Arrangement of leaves on the stem.
o Alternate: Sunflower