Year 9 Biology Practice Questions

Transcription

1 Name: Year 9 Biology Practice Questions Date: Time: Total marks available: 90 Total marks achieved:

2 Questions Q1. (a) The table shows some of the levels of organisation within an organism. Complete the table by inserting a tick ( ) to show the level of organisation of each example. The first one has been done for you. (4) (b) Place the following human structures in order of size from the smallest to the largest. (Total for question = 6 marks)

3 Q2. A student uses a microscope to look at some cells from an organ found in a plant. The diagram shows what the student observes through the microscope. One cell has been labelled X. (a) Name the organ that the student observes. (b) What is meant by the term organ? (c) Draw a labelled diagram of cell X. (3)

4 (Total for question = 5 marks)

5 Q3. A student prepared some plant cells taken from an onion. She placed the cells in a few drops of distilled water. She then used a camera attached to a microscope to photograph the cells. She then added a few drops of concentrated salt solution to the cells and waited a few minutes. She then took another photograph of the same cells. (a) Describe the differences in the appearance of the cells in concentrated salt solution compared with the cells in distilled water. (b) The student thought that the differences in the cells were caused by osmosis. What is meant by the term osmosis?

6 (c) Explain what happens to the cells in concentrated salt solution to change their appearance. (3) (d) Another student investigated the appearance of red blood cells in distilled water and in concentrated salt solution. Use your knowledge of osmosis and the structure of red blood cells to describe and explain what the red blood cells would look like (i) in distilled water (ii) in concentrated salt solution. (Total for question = 11 marks)

7 Q4. The diagram shows a food web from a habitat. (a) Use information in the food web to complete the table. The first one has been done for you. (4) (b) (i) The plants in this food web make the food for some of the animals to eat. Give the name used to describe these plants. (ii) The hawk catches and eats its prey. Give the name used to describe the hawk in this food web.

8 (c) A pesticide can be used to kill the grasshoppers in this habitat. (i) Describe the effect that killing grasshoppers would have on the number of shrews. (ii) Describe the effect that killing grasshoppers would have on the number of marsh grass plants. (Total for question = 8 marks)

9 Q5. A student wanted to investigate the factors that influence the activity of soil organisms in a woodland. She decided to study one species of woodlouse, a small animal found under stones and rotting wood in damp and dark places. She used a trap to collect organisms in the woodland during the day time and during the night time. She counted the organisms collected before releasing them. From the day time sample she produced a table of results. (a) Complete the table below to show the results for the night time sample.

10 (b) Use the data from the day time and night time samples to draw a bar chart to compare the number of organisms collected. (5)

11 (c) (i) Compare the number of organisms collected during the day time and during night time (ii) Suggest an explanation for the change in the numbers of woodlice (3) (d) The organisms caught in the trap remained there for up to 10 hours before being counted. Suggest how this might affect the results obtained (e) Ecology involves the study of organisms in their environment. With reference to the investigation in this question, explain the terms (i) population... (ii) community... (iii) habitat... (Total for question = 17 marks)

12 Q6. The passage describes atmospheric pollution by gases. Complete the passage by writing a suitable word or words in each of the blank spaces. The release of carbon dioxide comes from the burning of... fuels in power stations and in cars and other vehicles. This burning also releases... which dissolves in water in clouds to produce.... (10) If the combustion of these fuels is not complete another gas called... is also released. This gas is very toxic and can combine with... in the blood. This prevents the delivery of... around the body. Carbon dioxide may also contribute to the increase in air temperature referred to as... Gases that contribute to this are known as... gases. Some of these gases, such as..., are produced by cows and released into the atmosphere. Other gases known as... can be released when old refrigerators are destroyed. (Total for question = 10 marks) Q7. The table lists some greenhouse gases and gives their percentage contribution to the greenhouse effect. (a) (i) Which gas makes the greatest contribution to the greenhouse effect? (ii) Name a greenhouse gas not in the table.

13 (b) The percentage contribution for each gas is calculated using these three factors the abundance of the gas in the atmosphere how long the gas stays in the atmosphere how much radiation the gas absorbs (the gas's radiative effect) (i) Methane has a radiative effect 72 times greater than the same mass of carbon dioxide. Suggest why methane has a lower percentage contribution to the greenhouse effect than carbon dioxide. (ii) Suggest a reason why more attempts are being made to limit the release of carbon dioxide into the atmosphere than the release of water vapour. (iii) Describe two ways that humans can limit the release of carbon dioxide into the atmosphere (c) Describe two effects that global warming could have on an animal's habitat (Total for question = 9 marks) Q8. The diagram shows the carbon cycle with processes labelled A, B, C, D and E.

14 (a) (i) Name the process labelled A. (ii) Give the letters of the processes that add carbon dioxide to the atmosphere. (b) Many people are concerned that too much carbon dioxide is being released into the atmosphere. (i) Suggest two actions that could be taken to reduce the amount of carbon dioxide being released into the atmosphere (ii) Describe the consequences of an increase in carbon dioxide for the world's ecosystems. (6)

15 (Total for question = 10 marks)

16 Q9. The diagram shows the nitrogen cycle with four different stages labelled A, B, C and D. (a) Name the processes A, B, C and D. A... (4) B... C... D... (b) Name two different groups of organisms that act as decomposers (c) The nitrogen in a nitrate ion in the soil can become the nitrogen in a protein molecule in an animal.

17 Explain how this happens. (4) (d) Farmers sometimes add fertiliser to the fields in which they grow their crops. Suggest two advantages of using animal waste as a fertiliser rather than using a chemical fertiliser (Total for question = 12 marks) Mark Scheme Q1.

18 Q2.

19 (Total for question = 5 marks)

20 Q3.

21 Q4. Total 8 marks

22 Q5.

23 Q6. (Total for question = 10 marks) Q7.

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25 Q8.

26 Q9.

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