chap 3

Question 1

Human Blood

Answer 1

• a type of mixture
• can be separated into 2 components (yellow & red liquid)
• separated using centrifugal method

Question 2

Components of Blood

Answer 2

• consists of a suspension of RBC(45%), WBC & platelets(<1%), blood plasma (55%)
• blood plasma, made of ± 90% water and 10% dissolved substances

Question 3

Importance Of Blood Donation

Answer 3

• to save lives
• required for surgery, accident victims, etc.
• treat patients with leukaemia, haemophilia, etc

Question 4

Transpiration

Answer 4

• process of water loss in the form of water vapour from leaves to the air through evaporation

Question 5

Cross Section of a Leaf

Answer 5

• epidermis is made up of single layer of epidermal cells covering upper and lower epidermis

Question 6

Function of Stoma during Transpiration

Answer 6

• water lost during transpiration occurs through the stomatal pores
• photosynthesis(day), stoma is open (causes plant to lose water)
• stoma will also close to reduce water loss during transpiration

Question 7

Exudation (Guttation)

Answer 7

• water loss from plants in liquid form through hydathodes that are always open at the edge of the leaves
• usually occurs at night or when the air humidity is high

Question 8

Structures and Functions of the Components in Vascular Bundle of Plants

Answer 8

• transpiration helps transportation of water & mineral salts in plants
• during transpiration, water, and dissolved mineral salts diffuse into plants through roots to the stem and leaves

Question 9

Xylem

Answer 9

• transport water and mineral salts from roots to leaves to carry out photosynthesis & replace water lost during transpiration

Question 10

Phloem

Answer 10

• transport sucrose produced by leaves during photosynthesis to other parts of the plant