photosynthesis and leaf structure 6.1-6.2

Question 1

magnesium ions

Answer 1

• make chlorophyll
• without it leaves turn yellow

Question 2

nitrate ions

Answer 2

• make amino acids
• without it there will be stunt growth

Question 3

testing leaves in starch

Answer 3

1) remove green leaf from plant
2) boil it in hot water
- stop enzymatic reactions within cells in leaf)
3) put boiled leaf in boiling tube containing alcohol (ethanol)
- to extract chlorophyll as ethanol dissolves lipids in cell membranes
4) return leaf to hot water
- softens leaf and allows iodine penetration
5) remove leaf and perform iodine test

Question 4

testing carbon dioxide

Answer 4

1) HCO3
positive - yellow
neutral - red
negative - purple

2) lime water
positive - cloudy
negative - clear

Question 5

monocot plant

Answer 5

• 1 cotyledon ( seed )
• fibrous roots
• petals in multiple of 3
• leafs : narrow, parallel veins
• vascular bundle : scattered

Question 6

dicot plant

Answer 6

• 2 cotyledon
• tap roots
• 4 to 5 petals
• leafs: net like veins
• vascular bundle : ringed

Question 7

waxy layer/cuticle

Answer 7

prevents cell from drying out

Question 8

upper epidermis

Answer 8

prevent entry of disease causing organism

Question 9

palisade layer

Answer 9

photosynthesis happens

Question 10

spongy layer

Answer 10

gas exchange

Question 11

stoma

Answer 11

allow carbon dioxide exchange

Question 12

vascular bundle

Answer 12

made up of phloem and xylem

Question 13

lower epidermis

Answer 13

protects the cell inside the leaf

Question 14

limiting factor

Answer 14

a factor that is in short supply, therefore limits how quickly the plant can photosynthesise