Year 12 Biology Trial Paper

Questions.

Question 1.

Which of the following is an example of an infectious disease

• a)Malaria caused by bacteria
• b)Covid-19 caused by a missense mutation
• c) Chicken Pox caused by a virus
• d) Haemophilia caused by a gene mutation

Question 2.

Asexual reproduction in plants involves

• a) Pollination due to pollen dispersal into wind 
• b) Pollination due to pollen dispersal through pollinators 
• c) The growth of ribosomes
• d) The genetic technology of tissue culture to grow disease-free plants

Short answer questions.

Question 21.

Compare and contrast internal fertilisation and external fertilisation [6 marks]

Question 22.

Evaluate the significance of models for communication of scientific concepts, using an example. [6 marks]

Question 23.

E. Colli is a single-celled bacteria.

1. Bacteria reproduce through a process known as binary fission, what effect does this have on the genetic diversity of subsequent generations. [1 mark]
2. Devise an experimental procedure to determine the effectiveness of varying temperatures on E. Colli growth rates. [4 marks]

Question 24.

a) Evaluate Pasteur’s contribution to our modern understanding of infectious diseases. [6 marks]

b) A new disease has started to infect cows at a farm.

i) Explain how you could determine whether the disease is infectious for humans [3 marks]

ii) Explain a protocol that could be used to limit the spread, if the disease is found to be pathogenic. [3 marks]

Question 25.

Evaluate whether transgenic species should be used for agricultural purposes, using examples in your answer. [6 marks]

Answers.

1. c
2. d

21.

Criteria	Marks
Example & definitionHuman – internalSalmon – external	2 marks for an example of each
SimilaritiesCombination of parents genetic information, biodiversityContinuation of the species	2 marks for 2 similarities
DifferenceMaternal skills better for internalThe survival rate is higher for internalFewer offsprings for internalMore likely to occur in an aqueous environment for externallyTiming dependent more so for external	2 marks for 2 differences

22.

Requirements	Mark(s)
Define what a model is	1
Mention a model used in biology, such as pasteur’s swan neck flask model experiment	1
Identify two benefits e.gEasily and effectively communicate ideasTest out hypothesis, to determine whether you are missing something	2
Identify two riskse.gOften times is an oversimplification of the real phenomena, missing crucial elementsCan contain misconceptions or errors.	2

24.

• Swan neck flask experiment: Sterilized growth medium, spoilage occurred for swan neck flask that was open to microbes in the air, but not the one open to the air but closed to microbes.
• Disproved the theory of spontaneous generation 
• Provided evidence to support the germ of disease
• Preserve food, wine & later applied to milk through process of pasteurization
• He provided the first vaccine against rabies and anthrax
• Silkworm egg preservation technique, saving silkworm indystry
• Experimental design