SUPPORTING TISSUES IN PLANTS
Contents
- Axial and Appendicular Skeleton
- Supporting Tissues in Plants
The needs for supporting tissues in plants are for:
- definite shape;
- strength;
- rigidity;
- resistance against external forces such as wind and water.
Types of Supporting Tissues
- Parenchyma tissues
- Collenchyma tissues
- Sclerechyma tissues
- Xylem tissues
- Phloem tissues
Parenchyma Tissues
They are made up of living cells with cellulose and many air spaces within them. This is the most common and abundant plant tissue.
Functions
- It gives firms and turgidity to the stems of hibiscus
- stores food and water
- takes part in food synthesis in leaf mesophyll
Collenchyma Tissues
Made up of living cells, which are elongated and thickened at the corners.
Functions
- Provides strength and support to a young, growing plant.
- Gives flexibility and resilience to the plant.
Schlerenchyma Tissues
They are made up of thick cells containing cellulose and lignin. The tissues are rich in fibers.
Functions
- gives flexibility to plant
- provides strength, rigidity ,hardness and support to plant
Xylem
Xylem tissues are found in the vascular tissues of stems, roots, and leaves
Functions
- provides support, strength and shape to the plant
- Helps to conduct water and mineral salts from the roots to the leaves.
Phloem Tissues
Also located in the vascular bundles of all plants in their roots, stems and leaves
Functions
- Conduction of manufactured food from site of production to site of consumption and storage.
- Assist to provide support to the entire plant.
GENERAL EVALUATION
- Describe the structural features of a typical vertebra
- Define ossification.
- What is moulting?
- State four reasons for presence of supporting tissues in plant
- List supporting tissues found in plant and state their function.
WEEKEND ASSIGNMENT
SECTION A
- …………. is a non-living skeletal material
A. chondroblasts B. osteocyte C. elastic cartilage D. chitin
2. The articulating surface for joining together successive vertebrates is called
A. neural spine B. zygapophyses C. transverse processes D. neural canal
3. The canal for the passage of blood vessels in vertebrae is called A. neural canal B. cervical canal C. vertebral canal D. zygaphosis
4. Endoskeleton is present in the following animals except A. dog B. snake, C. shark, D. lizard
5. The most abundant supporting tissue in plants is A. sclerenchyma B. parenchyma C. xylem D. phloem
SECTION B
- (a) What is ecdysis? (b) Mention two animals in which it occurs
- Differentiate between (a) Bone and cartilage (b) Atlas and axis vertebrae