Plants, Tissues + Microscopy Flashcards
1
Q
What are the benefits of an electron microscope to a light microscope?
A
- can be used to study cells in finer detail
- enable scientists to see and understand many more sub cellular structures
2
Q
What is the function of a leaf?
A
- site of photosynthesis
3
Q
What are the layers of a leaf?
A
Upper epidermis
Palisade mesophyll
Spoungy mesophyll
Lower epidermis
4
Q
What is the purpose of the stomata and how is it adapted?
A
- where CO2 diffuses into leaf
- have guard cells to control opening and closing of the stomata to maximise CO2 absorption while minimising water loss
- guard cells sensitive to light so close at night
5
Q
What happens to the guard cells when there is a high concentration of water in the leaf?
A
- guard cells become turgid (cell vacuole fills up) which causes stomata to remain open to maximise CO2 absorption, opposite when not enough water
6
Q
What is meristem tissue? And where is it in a plant?
A
Plant stem cells , grows at tips of roots and shoots
7
Q
How is a lead adapted to prevent water loss?
A
- waxy cuticle (thin waterproof lipid layer prevents water escaping)
- guard cells
8
Q
What is the purpose of the palisade mesophyll and how is it adapted?
A
- site of photosynthesis
- lots of chloroplasts in palisade cells
9
Q
How is the upper epidermis adapted for its function?
A
- needs to let in sunlight for photosynthesis so is almost transparent
10
Q
What is the purpose of xylem and how is it adapted for its purpose?
A
- xylem tissues transport water and mineral ions from the roots to the stems and leaves
- composed of hollow tubes strengthened by lignin
11
Q
What is the purpose of phloem cells and how is it adapted?
A
- transport dissolved sugars from the leaves to rest of plant (for immediate use or storage)
- made of tubes of elongated cells (has pores in cell walls for cell sap to travel through)
