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S Sri Lankan School Muscat First Term Test 2015 / 2016
Class :
Subject :
Paper :
Duration:
Name :……………………………………….......................... Admission No: ………………. Instructions to Candidates:
Answer all questions.
The marks for each question are shown in brackets.
Total marks for the paper is 100.
Read each question carefully before you start to answer it
Show all steps in any calculations and state the units.
Paper Set By: Thakshila Damayanthi
Q.No. Marks
Allocated Obtained
1 05 2 06 3 08 4 15 5 13 6 16 7 10 8 06 9 11
10 10 Total 100
Year 10 G/ R
BIOLOGY
1
1 hour 40 min
Percentage
%
Grade
2
Answer ALL questions.
1. The diagram below represents a plant cell.
(a) Complete the table below by writing the parts, the cell structures and the functions. (3)
Part Cell Structure Function
Cell membrane
stores cell sap
B
(b) Using evidence from the diagram, explain why this cell is more likely to be a root cell than a leaf
mesophyll cell. (1)
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(c) Name the structural carbohydrate that is found in cell walls. (1) .....................................................................................................
(Total for Question 1= 5 marks )
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2. The diagram shows the apparatus used in a seed germination experiment.
(a) The two samples of seeds started at the same temperature of 180C. The diagram shows the temperature reading on each thermometer after 48 hours. (i) Complete the table to show the temperature of flask A and flask B. (1)
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(ii) Give a biological explanation for the difference in the temperature of flask A compared to flask B. (2)
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(b) The seeds in both flasks were washed using disinfectant before being put into the flasks. Suggest why this was done. (1)
................................................................................................................................................................... ................................................................................................................................................................... (c) The cotton wool kept the thermometers in place and prevented the seeds from falling out of the flasks.
Suggest why cotton wool was used rather than a rubber bung. (1)
.................................................................................................................................................................... .................................................................................................................................................................... (d) The seeds used in the experiment were from the same species.
Suggest one other variable that needs to be controlled in this experiment. (1)
.................................................................................................................................................................... (Total for Question 2 = 6 marks)
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3. Movement of substances into and out of cells can be by diffusion, osmosis or active transport.
(a) Match up the statements to the correct process by drawing a line from each process to the most appropriate statement. (2)
(b) Active transport involves the enzyme ATPase. Its activity may be affected by pH.
Explain how an enzyme’s activity is usually affected by pH. (3)
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(c) A student is given a sample of a carbohydrate. He tests to see if it is glucose.
Describe the chemical test he should use to identify glucose. (3)
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(Total for Question 3 = 8 marks)
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4. A student investigates the effect of temperature on the rate of starch digestion by amylase. He carries
out the first trial of his investigation at a room temperature of 200C.
He carries out the following steps in his investigation.
1 He puts one drop of iodine suspension into each of 12 wells on a spotting tile.
2 He then takes up 10 cm3 of 10% starch suspension into a syringe.
3 He adds one drop of the starch suspension from the syringe to the first well in the spotting tile and
records the colour change.
4 He rinses the outside of the syringe with water from a tap.
5 He then takes up exactly 5 cm3 of 5% amylase suspension into the same syringe containing the 10%
starch suspension.
6 He starts a stopwatch.
7 He then rocks the syringe containing the mixture gently backwards and forwards for one minute.
8 He adds one drop of the mixture from the syringe to the next well in the spotting tile and records the
colour change.
9 He repeats this at intervals of one minute until he has added starch and amylase mixture to all of the
wells.
10 He then repeats steps 1–9 but this time he uses iodine, amylase and starch suspension that have been
stored in a water bath at 400C.
11 He also keeps the syringe containing the mixture in the water bath at 400C between drops.
The photograph shows his results for 200C at the end of the experiment when all the wells have mixture
added.
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(a) (i) Give one safety precaution the student should take when carrying out this investigation. (1) ..............................................................................................................................................................
(ii) How many minutes do the samples of mixture added to the spotting tile in the photograph represent? (1)
............................................................................................................................................................... (b) Explain the purpose of the following steps in the student’s experiment. (i) step 4 (1) ...............................................................................................................................................................
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(ii) step 7 (1)
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(iii) step 11 (1) ................................................................................................................................................................
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(c) (i) Identify two variables that the student controls in his experiment. (2) 1...............................................................................................................................................................
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(ii) Name the independent variable that the student is investigating. (1) ................................................................................................................................................................ (d) Using the photograph, explain how many minutes it took for the reaction to be completed at 200C. (3)
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(e) The results for the spotting tile at 40 0C would be different from the trial carried out at 200C. (i) Describe how the appearance of the results will be different. (2) ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (ii)Explain the difference in the appearance of the results. (2) ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. ................................................................................................................................................................. (Total for Question 4 = 15 marks)
5. The photograph shows some viruses.
(a) Suggest two reasons why most biologists do not classify viruses as living organisms. (2) 1...................................................................................................................................................................
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(b) Name one example of a virus. (1)
...................................................................................................................................................................... (c) Give one structural difference between a bacterium and a virus. (1)
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(d) Although plants and animals have many different features, they also have some features in common.
The table lists some features.
In each box, place a tick ( ) if the feature is present or a cross (×) if the feature is absent. (5)
Feature Plants Animals
Can move from place to place
Can carry out photosynthesis
Are multicellular
Have cells with cell walls
Store carbohydrate as glycogen
(e)The following organisms can be classified into major groups.
From the list above give the name of (4)
(i) a bacterium ...............................................................................................................................
(ii) a fungus ...............................................................................................................................
(iii) a flowering plant ...................................................................................................................
(iv) an animal ...............................................................................................................................
(Total for Question 5 = 13 marks)
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6. The diagram shows the human digestive system.
(a) Name the structures labeled A, B, C, F, H and I. (6)
A..................................................... B ...............................................................
C..................................................... F ...............................................................
H.................................................... I ................................................................
(b) Use letters from the diagram to answer these questions. Each answer may be one letter or more than one letter. (3) (i) Where is amylase made?
.................................................................................................................. (ii) Where are faeces stored?
.................................................................................................................. (iii) Where is protein digested?
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(c) Describe and explain how the structure of the small intestine is adapted for absorbing digested food. (5) ........................................................................................................................................................................
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(d) Describe the role of H in digestion. (2)
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(Total for Question 6 = 16 marks)
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7 . The table shows the energy requirements (in kilojoules) for females at different ages and different levels of activity.
(a) Plot a line graph on the grid below to show how age affects the energy requirements at each level of activity.
Use a ruler to join the points with straight lines. (5)
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(b) Describe how increasing age changes the energy requirements of females. (2)
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(c) Explain the effect that the level of activity has on the energy requirements of females. (3)
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(Total for Question 7 = 10 marks)
8. (a) The diagram shows a piece of apparatus called a calorimeter.
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The calorimeter is used to investigate the energy content of one gram of glucose. The glucose burns in the calorimeter and the energy released heats the water. (i) Suggest why oxygen gas is passed into the calorimeter. (1)
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(ii) Suggest why the waste gas pipe is coiled. (2)
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(iii) Suggest why stirring the water will improve the data collected. (1)
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(b) The calorimeter contains 200 g of water. The graph shows the rise in temperature of the water in the calorimeter during the investigation.
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(i) Use the graph to find out the increase in the temperature of the water during the investigation. (1)
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(ii) Use the formula to calculate the energy content of the 1 g of glucose. (1)
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(Total for Question 8 = 6 marks)
9. An experiment is set up to find out if carbon dioxide is needed by plants for photosynthesis. Two plants were destarched and then put in glass containers A and B as shown in the diagram.
After two days in the containers the plant leaves are tested for starch.
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(a) (i) Suggest why the pots were covered with clear-plastic bags. (2)
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(ii) What is the purpose of container B? (1) .................................................................................................................................................................. (iii) The plant species and the time were kept the same in the experiment. Suggest two other variables that should be kept the same for the experiment to be valid. (2)
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(b) The table describes the stages used to test the leaves for starch. It also gives the reason for each stage.
(i) Complete the table by describing stage 2 and giving the reasons for stages 1 and 4 . (3)
Stage Reason
1. boil leaf in water
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Remove chlorophyll
3. dip leaf in water
Hydrate leaf for iodine diffusion
4. add iodine solution to leaf
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(ii) Explain how stage 1 will prevent any starch digestion. (1)
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(iii) Describe the colour of the leaves you would expect after a starch test on. (2)
a leaf from container A ...........................................................................................................................
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a leaf from container B ...........................................................................................................................
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(Total for Question 9 = 11 marks)
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10.The diagram shows a cross section through a leaf.
(a) Each part of the leaf is adapted for a specific function. Name each part of the leaf and explain how it helps the leaf in photosynthesis. (i) Layer A (2)
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(ii) Layer B (3)
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(iii) Layer C (3)
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(iv) Structure D (2)
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(Total for Question 10 = 10 marks)
(TOTAL FOR PAPER= 100 MARKS)
