DP Level 1 - Life Science

Class Exercise 2

Melody Leung

Vascular Bundle

Stem

Leaf 1/5 Upper / Lower epidermis

2/3 Mesophyll; 4 Air cavity

6 Stomata; 7 Trichome (fine hair)

8 Major vein - 9 xylem; 10 phloem

11 supporting tissue

6 cm split

5 h

Chrysanthemum – total split

Put one of the stem into

BLUE solution and

another into water for 5 h

Chrysanthemum – half split

6 cm split

6 cm joint 5 h

Put one of the stem into

BLUE solution and

another into water for 5 h

Tasks

• Describe your observations?

– Area of staining

– Even? Punctate?

– Any others?

• With your knowledge in the water transportation system in

plants, construct an hypothesis that could explain the staining

patterns of the “total split” and “half split” chrysanthemum.

Base on your hypothesis, predict

(with explanation) the fate of this

chrysanthemum.

Air dry for 5 hwater

6 cm total split