2.3.1 Plant tissues Flashcards
(12 cards)
1
Q
Upper epidermis (2p)
A
- Covers the surface and protects the leaves
- Secretes a waxy substance that waterproofs the leaf
2
Q
Palisade mesophyll
A
- Contains chloroplast for photosynthesis
3
Q
Spongey mesophyll (2p)
A
- Contains some chloroplast
- Has big air spaces and large surface area for easier diffusion
4
Q
Xylem
A
Transfers water and minerals from the roots up to other parts of the plant
5
Q
Phloem
A
Transports sugar from leaves
6
Q
Lower epidermis
A
Contains guard cells and stomata
7
Q
Guard cells
A
Open and close stomata
8
Q
Stomata (2p)
A
- Pores to allow gas exchange
- Controls water loss
9
Q
Meristem tissues (2p)
A
- Found at growing tips of roots and shoots between xylem/phloem vessels
- Contains rapidly dividing plant cells that grow and differentiate into all the other cell types needed
10
Q
Why is the palisade mesophyll considered an organ?
A
Made up of specialised cells working together to carry out photosynthesis
11
Q
Why is a leaf considered to be an organ?
A
Made up of different types of tissues working together
12
Q
Layers of a leaf (5p)
A
1) Upper epidermis
-2) Palisade mesophyll
3) Spongey mesophyll
4) Lower epidermis
- Xylem on top of phloem
