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.
- Bacteria reproduce through a process known as binary fission, what effect does this have on the genetic diversity of subsequent generations. [1 mark]
- 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.
- c
- 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
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