Predicted Biology Paper

Question 1

Compare the functions of xylem and phloem

Answer 1

The xylem transports water and mineral up the plant in a process called transpiration but the phloem transports sugars up and down the plant in a process called translocation

Question 2

What is the function of the bacteria in small intestine

Answer 2

Make vitamins and protects against pathogens

Question 3

Explain 2 risk factors and their association with non communicable diseases

Answer 3

Smoking - chemicals in the cigarette smoke tar and nicotine damage alveoli in the lungs and endothelial lining of the arteries causing lung disease and cancer
Obesity: excess consumption of sugars reduces body’s sensitivity to insulin causing type 2 diabeties

Question 4

What does a ldl of magnesium cause

Answer 4

Lack of chlorophyll - fewer chloroplast - plant becomes more yelllow - chlorosis - not absorb as much light for photosynthesis - not be able to grow as much

Question 5

Uses of energy from respiration

Answer 5

Chemical reactions to build larger molecules from smaller molecules e.g proteins from amino acid
Muscle con traction for movement
Keeping Sam to maintain suitable temp for enzyme activity

Question 6

Advantages and disadvantages of MABs

Answer 6

+ cheaper to develop than most conventual drugs as is based on tested tech oncology
Side effects can be reduces by using mice human hybrid cells or using a fraction of antibodies
Treat a wide range in conditions
- expensive
Many side effcts

Question 7

Uses of nitrate ions and potassium ions

Answer 7

Nitrates - production of amino acids for proteins for growth
Potassium - production of flowers and fruit

Question 8

2 ways a farmer can identify plant disease

Answer 8

Using testing kit constin8ng MABs to identify presence of pathogens quickly and easily
Checking and comapring in garden manual or online

Question 9

Describe how a aphid can cause problems

Answer 9

Aphids have long shaped mouthpieces that pierce the surgace lf plant stem and into the phloem where they then feed off of cell Sap and the sugar. They can remove large quantities weakinging plant affecting growth . Aphids also acts as a vector for tran motor of diseases

Question 10

Why is it good deciduous trees loose leaves during winter

Answer 10

Infection can be taken with them