plant tissues 🌱 Flashcards
1
Q
Tissue
A
- a group of similar differentiated cells which perform a common function
2
Q
Meristematic tissue
A
- actively dividing tissue in which new cells are continuously formed ; not yet differentiated
- apical and lateral meristem
3
Q
Apical meristem
A
- consists of a group of cells near tips of roots and stems
- responsible for growth in length by mitosis
- small cube shaped cells ; thin cell wall
- large nuclei
4
Q
Lateral meristem
A
- responsible for secondary growth / growth in thickness ( increase in girth )
- thicker cell wall than apical meristem
- flatter and elongated cells
5
Q
Permanent tissue
A
- tissue that is already differentiated to perform a specific function
- epidermis, parenchyma, collenchyma, sclerenchyma, vascular tissue
6
Q
Epidermis
A
- forms layers around : roots,stems,leaves
- protects underlying tissue form injury and desiccantion (drying out)
☆ basic epidermis, root hair, stoma
7
Q
Parenchyma
A
- most abundant plant tissue
- large cells; thin cell walls; large vacuoles; large intercellular spaces
- stores food( sugar + starch) and water
- provides rigidity/ acts as a packing tissue
8
Q
Sclerenchyma
A
- found in leaves, stems, fruit, flowers, roots
- serves as a strengthening tissue
- provides plant with mechanical support
- evenly thickened cell walls (lignin)
- inactive cell contents
9
Q
Collenchyma
A
- usually in young herbaceous stems or leaves
- unevenly thickened cell walls (cellulose)
- serves as strengthening tissue
- provides mechanical support
10
Q
Vascular tissue
A
- phloem and xylem
- forms the transport system of the plant
- occurs in roots, stems, leaves
11
Q
Xylem vessels
A
- considered as dead tissue
- serves as strengthening and support to plant
- transports water and dissolved mineral salts to the rest of the plant
12
Q
Phloem
A
- consists of sieve tubes and companion cell
- transport of produced organic nutrients from the leaves to the rest of the plant
