Exam (elaborations)

Biology Most commonly asked Questions Paper 1

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.................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 2020 Jan P-1B (ii) Discuss why some farmers limit the amount of chemical fertilisers they add to their crops. (5) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (Total for Question 5 = 11 marks) 2020 Jan P-1B (iii) Describe what happens to the structures in part C after fertilisation. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 2020 Jan P-1B (iii) Give one observation that shows a seed has germinated. (1) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (Total for Question 10 = 12 marks) TOTAL FOR PAPER = 110 MARKS 2020 Jan P-1B DO NOT WRITE IN THIS AREA DO 5 Plants can be genetically modified (GM) to produce insect poison. They are modified using a bacterium called Agrobacterium. This bacterium has a plasmid that contains recombinant DNA. (a) Describe how the plasmid is modified to contain recombinant DNA. (3) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 2020 Nov P-1B DO NOT WRITE IN THIS AREA DO NOT ( d) Milk is used to make yoghurt. (i) Name the carbohydrate in milk used to make yoghurt. (1) .................................................................................................................................................................................................................................................................................... (ii) Name the bacteria added to milk to make yoghurt. (1) .................................................................................................................................................................................................................................................................................... (iii) Explain why milk needs to be heated to a high temperature at the start of the process for making yoghurt. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... ...............................................................................................................................

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Institution: Biology aqa a level
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Uploaded on: October 15, 2024
Number of pages: 60
Written in: 2024/2025
Type: Exam (elaborations)
Contains: Questions & answers

Subjects

biology most commonly asked questions paper 1
water pollution can occur if sewage enters a river
10 a balanced diet should include the correct prop

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, 2019 June P-1B
(b) Water pollution can occur if sewage enters a river.
Explain the biological consequences of sewage pollution on a river ecosystem.
DO NOT WRITE IN THIS AREA

(6)

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DO NOT WRITE IN THIS AREA

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DO NOT WRITE IN THIS AREA

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(Total for Question 9 = 9 marks)

27
*P58564RA02732* Turn over

,DO NOT WRITE IN THIS AR (d) The corn becomes infected by a fungus. 2019 June P-1BR
(i) Explain how this fungus feeds on the corn.
(3)

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DO NOT WRITE IN THIS AREA

(ii) Which of these organisms will be hunted more often by predators when the
corn is infected by a fungus?
(1)
A grass
B owl
C rabbit
D snake

3
*P60181RA0332* Turn over

, DO NOT WRITE IN THIS A (i) Human height is under polygenic control. 2019 June P-1BR
State the meaning of the term polygenic.
(1)

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(ii) Using the graph, determine the mode and median heights for males and females.
(2)

Mode Median

Females
DO NOT WRITE IN THIS AREA

Males

(iii) Suggest two reasons why the mean height for males is greater than the mean height
for females.
(2)

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17
*P60181RA01732* Turn over

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Biology Most commonly asked Questions Paper 1

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