experiments

Question 1

observing the zylem and phloem

Answer 1

celery in dyed water for 24hrs, observe the cross section (transverse and longitudinal)
longitudinal = down
transverse = across

xylem near the middle, phloem facing outward

Question 2

enzymes
the effect of substrate concentration on enzyme activity

Answer 2

• ## observe how the substrate (hydrogen peroxide) affects the relative activity of enzymes
• 6 test tubes
  
  1. 2ml hydrogen peroxide solution and 8ml of distilled water
  2. 4hp 6dw
  3. 6hp 4dw
  4. 8hp 2dw
  5. 10ml hp
  6. 10ml dw
• 1g of fresh liver in each

Question 3

enzymes
the effect of temperature on enzyme activity

Answer 3

four groups - two test tubes each (one just 10ml of milk and other with 10ml milk with crushed junket tablet)

g1- 0 degrees C
g2- 20 degrees C
g3- 38 degrees C
g4- 80 degrees C

test time it takes for the milk to coagulate / curdle