2e Flashcards
1
Q
Upper epidermis
A
- Reduces water loss by evaporation –> Covered by a thin waxy layer (cuticle)
- Few chloroplasts
- Transparent
2
Q
Paliside layer
A
- Main sight of photosynthesis
- Long narrow cells
- Many chlorplasts
3
Q
Spongy layer
A
- Where gas exchange takes place
- Rounded, loosely packed
4
Q
Xylem
A
- Supplies water and mineral ions
- Hollow tubes
5
Q
Phloem
A
- Sucrose & amino acids
- Hollow tubes
6
Q
Lower epidermis / Guard cells
A
- Change shape in order to open or close stoma
- Many holes
7
Q
Photosynthesis
A
- A series of chemical reactions from which plants get food (glucose)
- Carbon dioxide + water –(Light & Chlorophyll)–> glucose + oxygen
- 6Co2 + 6H2o —> C6H12O6 + 6O2
8
Q
Mineral Ions
A
- Magnesium ions are needed for chlorophyll
- Nitrate ions are needed for amino acids
9
Q
Factors for rate of photosynthesis
A
- As all of these increase, rate of photosynthesis also does
- Carbon dioxide concentration
- Light intensity
- Temperature
10
Q
Vitamin A
A
- Pigment of the retina
- Protects the eye
- Sources: Oils
11
Q
Vitamin C
A
- Stick together cell’s lining
- Sources: Fresh fruits and vegetables
12
Q
Vitamin D
A
- Help bones absorb calcium and phosphate
- Sources: Fish liver oils, made in skin in sunlight
13
Q
Iron
A
- Part of haemogoblin
- Sources: Red meat, liver, eggs, some vegetables
14
Q
Calcium
A
- Make teeth and bones
- Sources: Dairy produces
15
Q
Metabollic
A
Chemical reactions
