Mock Exam Paper F Marking Scheme

Marking Scheme Mock Biology Exam L C 2016

Section A Answer any five questions

1

Any five answers.

(1) Hydrogen

(2) Oxygen

2(2)

Benedict’s test / Fehling’s solution

(4)

Pepsin / Pepsinogen

(4)

Amino acids

(4)

Iron / Copper / Zinc (any two)

2(2)

Food: Starch

Colour change: Red/yellow/brown to blue/black

2(2)

2

Educated guess or (possible) explanation based on observations

(4)

Hypothesis (or explained) supported (by experiment)

(4)

A theory that has been proven valid under all tested conditions

(4)

(Set up for) comparison

(4)

A harmless, tasteless pill given to the control group to provide a comparison to the active drug being tested.

(4)

3

(X) Hepatic vein

(Y) Hepatic portal vein or portal system

(Z) Intestine

3(2)

Three arrows

3(2)

Produces bile / detoxifies the body / breaks down amino acids to urea / converts excess glucose to glycogen / stores some vitamins and minerals / produces clotting proteins / produces cholesterol which is needed to produce some hormones / produces heat to maintain homeostasis (any four)

4(2)

4

(a)

Interphase

(2)

(b)

Chromosome uncoiling / transcription / DNA replication or duplication / Production of new organelles (any two)

2(2)

(c)

Prophase

(2)

(d)

Haploid cells have one copy of each chromosome. Diploid cells have two copies of each chromosome.

2(2)

(e)

Cancer is the name given to a group of disorders in which cells lose control over their rate of mitosis and number of times mitosis occurs.

(2)

(f)

Causes: Genetic / viral / cigarette smoking / exposure to asbestos / exposure to some types of radiation / any other valid carcinogen

Treatments: Radiotherapy / Chemotherapy / Surgery / Monoclonal antibodies / Any other valid treatment option

2(2)

2(1)

5

Cells with common function (or with common structure)

(2)

Xylem

(2)

A = vessel

B = tracheid

2(3)

Transports water and dissolved minerals from the root to the leaves

(2)

Lignin is a strong material found in the cell walls of xylem vessels and tracheids. It provides reinforcement.

(2)

Name: Phloem

Function: Transports food from photosynthesis in leaves to t...

Sign In To View

Sign in or sign up in order to view resources on iRevise

Sign In Create An Account