1. Tracheids
2. Vessels
3. Xylem
4. Fibres
5. Xylem parenchyma
Fibres
1. Sieve fibres
2. Xylem fibres
3. Phloem fiobres
4. Mesocap fibres of coconut
Phloem fiobres
1. Extrach protoxylem
2. Number of xylem strands
3. Endarch protoxylem
4. Occurrence of secondary growth
Extrach protoxylem
1. 13 years
2. 26 years
3. 52 years
4. 104 years
13 years
1. Stomata
2. Lenticels
3. Aerenchyma
4. Wounds
Lenticels
1. In the pith cells
2. At tips of roots and stems
3. In cells of cortex
4. In the intrenodal region
At tips of roots and stems
1. Apex is protected by root cap
2. Vascular bundles are collateral
3. Xylem is centripetal in growth in the young roots
4. Cuticle is absent in young stages
Vascular bundles are collateral
1. Phelloderm
2. Phellogen
3. Bark
4. Phellem
Phelloderm
1. Absence of stomata
2. Long tap root system
3. Stripular leaves
4. Spines
Spines
1. Chaparral
2. Savannah
3. Tundra
4. Deciduous forest
Chaparral