Nutrition in Living Organisms · CSEC Biology

211 past-paper questions on Nutrition in Living Organisms, part of Life Processes and Disease, from every CSEC Biology paper on Quelpr.

1. 1(a)2 marks· Biology Q1 1(a)Complete the key beside Figure 1b to indicate the colours represented by the blackened and non-blackened circles.
2. 1(a)2 marks· Biology Q1 1(a)Outline the procedure used to prepare the sample for carrying out the food tests.
3. 1(a)(i)5 marks· Biology Q1 1(a)(i)In the space provided below construct a table to show how the data from the experiment might be collected.
4. 1(a)(i)2 marks· Biology Q1 1(a)(i)Identify TWO parts of a flowering plant where food is stored.
5. 1(a)(i)2 marks· Biology Q1 1(a)(i)State TWO precautions that they should take in carrying out this experiment.
6. 1(a)(i)4 marks· Biology Q1 1(a)(i)Construct a table to represent the data shown on the graph in Figure 1, using FOUR temperature values from the graph.
7. 1(a)(i)4 marks· Biology Q1 1(a)(i)Using the data in Table 1, complete the graph on page 3 to show the rate of reaction of Enzymes X and Y at the different pH levels.
8. 1(a)(i)4 marks· Biology Q1 1(a)(i)Plot the data in Table 1 on the grid below.
9. 1(a)(i)2 marks· Biology Q1 1(a)(i)Describe the reaction rate between points A and B, and between points B and C in Figure 1.
10. 1(a)(i)6 marks· Biology Q1 1(a)(i)Describe how the students may investigate the hypothesis. Include in your description any apparatus/materials required.
11. 1(a)(i)4 marks· Biology Q1 1(a)(i)Plot a graph on the grid provided on page 5 to show the relationship between the number of oxygen bubbles released and temperature.
12. 1(a)(ii)1 mark· Biology Q1 1(a)(ii)From your graph, determine the optimum temperature for the enzyme.
13. 1(a)(ii)2 marks· Biology Q1 1(a)(ii)Write an aim for the investigation.
14. 1(a)(ii)1 mark· Biology Q1 1(a)(ii)What is the optimum temperature for the enzyme in this reaction?
15. 1(a)(ii)4 marks· Biology Q1 1(a)(ii)The results of their experiment are presented in Table 1. On the grid provided in Figure 1 on page 5, draw a graph to represent the results presented in Table 1.
16. 1(a)(ii)2 marks· Biology Q1 1(a)(ii)Name TWO food nutrients in plant storage organs that humans use as food.
17. 1(a)(ii)1 mark· Biology Q1 1(a)(ii)Give ONE reason why the rate of reaction for both enzymes was sometimes zero.
18. 1(a)(ii)3 marks· Biology Q1 1(a)(ii)Describe the trend in enzyme activity as shown by the graph in Figure 1.
19. 1(a)(ii)1 mark· Biology Q1 1(a)(ii)Use the graph plotted in (a)(i) to identify the optimum temperature for Enzyme X.
20. 1(a)(iii)6 marks· Biology Q1 1(a)(iii)Explain the shape of the graph at EACH of the following temperature ranges: 0-10 °C, 11-40 °C, > 40 °C
21. 1(a)(iii)2 marks· Biology Q1 1(a)(iii)Account for the shape of the graph: Between 5 °C and 30 °C
22. 1(a)(iii)1 mark· Biology Q1 1(a)(iii)Suggest ONE precaution the students should take in their investigation.
23. 1(a)(iii)2 marks· Biology Q1 1(a)(iii)Explain what happens to the enzyme at temperatures above 37 °C.
24. 1(a)(iii)1 mark· Biology Q1 1(a)(iii)From the graph in Figure 1, identify the optimum temperature for the protease activity.
25. 1(a)(iii)2 marks· Biology Q1 1(a)(iii)Account for the shape of the graph: Above 40 °C
26. 1(a)(iii)a)6 marks· Biology Q1 1(a)(iii)a)What is the optimum pH for Enzyme X? What is the optimum pH for Enzyme Y?
27. 1(a)(iii)b)1 mark· Biology Q1 1(a)(iii)b)Which enzyme functions at a lower pH range?
28. 1(a)(iii)c)1 mark· Biology Q1 1(a)(iii)c)Which enzyme produces more products at its optimum pH?
29. 1(a)(iii)d)1 mark· Biology Q1 1(a)(iii)d)Is it likely that Enzyme X and Enzyme Y are similar? Give ONE reason for your answer.
30. 1(a)(iv)4 marks· Biology Q1 1(a)(iv)Suggest ONE reason for the shape of the graph at less than 10 °C, TWO reasons for the shape of the graph between 10 and 55 °C, and ONE reason for the shape of the graph at more than 55 °C.
31. 1(a)(iv)1 mark· Biology Q1 1(a)(iv)Write a conclusion that the students could draw from their results.
32. 1(a)(iv)1 mark· Biology Q1 1(a)(iv)State ONE precaution that the students should take when carrying out this experiment.
33. 1(a)(v)1 mark· Biology Q1 1(a)(v)Suggest ONE reason why living organisms need to maintain a constant internal temperature.
34. 1(a)(v)3 marks· Biology Q1 1(a)(v)Describe a suitable procedure that the scientists could use to investigate the effect of pH on the activity of the protease enzyme.
35. 1(a)(vi)2 marks· Biology Q1 1(a)(vi)Describe TWO precautions that the students should take when doing this experiment.
36. 1(a)(vii)2 marks· Biology Q1 1(a)(vii)How could this experiment be modified to investigate the effect of pH on enzyme activity?
37. 1(b)6 marks· Biology Q1 1(b)Complete Table 1 by describing the procedure that is used to test for the presence of EACH food nutrient in the meal and the expected results if the food nutrient is present.
38. 1(b)8 marks· Biology Q1 1(b)Using information in Figure 1, construct in the space provided below, a table to show the data obtained by the student in investigating the rate of enzyme reaction. Your table should contain six rows of data/information.
39. 1(b)5 marks· Biology Q1 1(b)Design an experiment to determine the rate at which starch is broken down under different pH conditions.
40. 1(b)5 marks· Biology Q1 1(b)The product of reactions catalyzed by Enzymes X and Y is a reducing sugar. Describe a test the students could use to confirm the presence of the reducing sugar. Give the apparatus and materials to be used and describe…
41. 1(b)2 marks· Biology Q1 1(b)Name TWO enzymes that function in protein digestion and describe the role of EACH.
42. 1(b)(i)4 marks· Biology Q1 1(b)(i)Explain why the colour of the drops remained the same for the 10 minutes in row A and row E.
43. 1(b)(i)9 marks· Biology Q1 1(b)(i)Complete Table 1 by describing the method and conclusion for EACH food test the students carried out.
44. 1(b)(i)6 marks· Biology Q1 1(b)(i)On the graph paper on page 5, construct a line graph to show the effect of carbon dioxide concentration on the rate of photosynthesis.
45. 1(b)(i)2 marks· Biology Q1 1(b)(i)Name TWO enzymes that break down protein.
46. 1(b)(ii)1 mark· Biology Q1 1(b)(ii)What substance would you expect to find in Tube D after 2 minutes?
47. 1(b)(ii)4 marks· Biology Q1 1(b)(ii)Explain why the storage organ tested in (b)(i) should be included in the diet of a teenage boy.
48. 1(b)(ii)2 marks· Biology Q1 1(b)(ii)State TWO characteristics of producers in a food web.
49. 1(b)(ii)2 marks· Biology Q1 1(b)(ii)Using Table 1 and the graph you constructed, determine the concentration at which carbon dioxide is a limiting factor at high and low light intensities respectively.
50. 1(b)(ii)2 marks· Biology Q1 1(b)(ii)Name TWO parts of the human alimentary canal where enzymes that break down protein are found.
51. 1(b)(iii)2 marks· Biology Q1 1(b)(iii)Describe the test that could be carried out to find out if you were correct at (b)(ii) above.
52. 1(b)(iii)3 marks· Biology Q1 1(b)(iii)A boy fed ONLY on the storage organ tested in (b)(i) was found to be malnourished. Explain how this is possible.
53. 1(b)(iii)2 marks· Biology Q1 1(b)(iii)Both plants and animals need to store food. With reference to ONE storage site in animals, explain why food storage is important.
54. 1(b)(iii)2 marks· Biology Q1 1(b)(iii)Suggest TWO reasons why the different enzymes for breaking down proteins are located in two different parts of the alimentary canal.
55. 1(b)(iv)4 marks· Biology Q1 1(b)(iv)The seedlings shown in Figure 2 use all the nutrients stored in the cotyledons. Discuss the process by which these plants can make more nutrients.
56. 1(c)1 mark· Biology Q1 1(c)One function of the plant part shown at Y is storage. Identify ONE organ in the human body that serves the same function.
57. 1(c)3 marks· Biology Q1 1(c)No test for fats was conducted on the storage organ in (b)(i). Describe TWO tests for fats.
58. 1(c)(i)2 marks· Biology Q1 1(c)(i)Name ONE enzyme involved in the chemical digestion of carbohydrates and ONE enzyme involved in the chemical digestion of proteins in the alimentary canal.
59. 1(c)(i)7 marks· Biology Q1 1(c)(i)If the enzyme used in this investigation were amylase, describe fully the method you would use to obtain the data for the graph. Identify the materials and apparatus.
60. 1(c)(i)2 marks· Biology Q1 1(c)(i)Name TWO parts of the human digestive system where amylase may be found.
61. 1(c)(i)3 marks· Biology Q1 1(c)(i)Using information from the experiment in Figures 1a and 1b, complete the graph below to show the effect of temperature on the time taken for the reaction between the starch and the enzyme to be completed.
62. 1(c)(i)2 marks· Biology Q1 1(c)(i)Although they are produced by different organs in the human digestive system, Enzymes X and Y break down the same nutrient in the body. Identify Enzymes X and Y.
63. 1(c)(i)4 marks· Biology Q1 1(c)(i)Starch is the most common carbohydrate that is found in the leaves of green plants. Describe a test that the students could do in the laboratory to investigate whether starch is present in the leaves of the seedlings.
64. 1(c)(i)2 marks· Biology Q1 1(c)(i)Name TWO parts of the alimentary canal that are responsible for the mechanical digestion of food.
65. 1(c)(ii)4 marks· Biology Q1 1(c)(ii)Suggest ONE reason why it is important for the recovering child to eat adequate amounts of carbohydrates and THREE reasons why it is important for the recovering child to eat adequate amounts of proteins.
66. 1(c)(ii)1 mark· Biology Q1 1(c)(ii)Identify ONE source of error in the investigation.
67. 1(c)(ii)2 marks· Biology Q1 1(c)(ii)Explain why the digestion of starch stops when food reaches the stomach.
68. 1(c)(ii)1 mark· Biology Q1 1(c)(ii)At what temperature did the reaction take place most rapidly?
69. 1(c)(ii)3 marks· Biology Q1 1(c)(ii)Describe an experiment to determine whether a leaf on a potted plant has been photosynthesizing.
70. 1(c)(ii)2 marks· Biology Q1 1(c)(ii)While absorbing water from the soil, plants absorb mineral salts such as magnesium, calcium and nitrogen. State ONE role of magnesium and ONE role of calcium in plants.
71. 1(c)(ii)2 marks· Biology Q1 1(c)(ii)Label the diagram in Figure 1 to show where Enzymes X and Y are found.
72. 1(c)(ii)1 mark· Biology Q1 1(c)(ii)Name ONE plant organ, other than leaves, where starch may be found.
73. 1(c)(ii)2 marks· Biology Q1 1(c)(ii)Give TWO reasons why mechanical digestion of food is important.
74. 1(c)(iii)4 marks· Biology Q1 1(c)(iii)What would you expect to happen if, at the end of the 10-minute period, the contents of Tubes A and E were brought to 30°C and then tested with iodine? Give ONE reason for your answer in EACH case.
75. 1(c)(iii)1 mark· Biology Q1 1(c)(iii)Name an enzyme which works best in the stomach.
76. 1(c)(iii)1 mark· Biology Q1 1(c)(iii)Apart from carbon dioxide and sunlight, identify ONE OTHER environmental factor that is required for photosynthesis.
77. 1(c)(iii)2 marks· Biology Q1 1(c)(iii)Name TWO conditions OTHER THAN light, that are necessary for photosynthesis.
78. 1(c)(iii)2 marks· Biology Q1 1(c)(iii)Nitrogen is used by plants to make protein. Suggest TWO reasons why plants need protein.
79. 1(c)(iii)2 marks· Biology Q1 1(c)(iii)Suggest TWO advantages to humans of having two forms of the same enzyme.
80. 1(c)(iii)2 marks· Biology Q1 1(c)(iii)Explain the significance of chemical digestion of food.
81. 1(c)(iii)2 marks· Biology Q1 1(c)(iii)Instead of starch, animals store complex carbohydrates such as glycogen. Name TWO organs in an animal's body which store glycogen.
82. 1(c)(iii)3 marks· Biology Q1 1(c)(iii)Describe a suitable procedure for testing the presence of protein in peanuts.
83. 1(c)(iv)2 marks· Biology Q1 1(c)(iv)Suggest TWO reasons why plants need protein.
84. 1(d)2 marks· Biology Q1 1(d)Explain how the method of nutrition used by the wild pine differs from the method of nutrition used by the other organisms in the table.
85. 1(d)2 marks· Biology Q1 1(d)Food is also stored in animals. Identify TWO areas in the human body where food is stored.
86. 1(d)(i)2 marks· Biology Q1 1(d)(i)Suggest TWO ways in which the type of nutrition carried out by green plants differs from that carried out by humans.
87. 1(d)(i)1 mark· Biology Q1 1(d)(i)What process might be taking place to soften the meat?
88. 1(d)(i)3 marks· Biology Q1 1(d)(i)Amylase is also found in plants. Suggest THREE plant structures in which amylase may be found.
89. 1(d)(i)5 marks· Biology Q1 1(d)(i)Use the information on page 2 to describe the procedure used to set up this investigation, by placing each step in the correct order in which it should be carried out to ensure accuracy. Include ONE precaution that you…
90. 1(d)(i)4 marks· Biology Q1 1(d)(i)Breast milk is described as best for babies. Using the information in Table 2, give TWO reasons why this description is appropriate.
91. 1(d)(i)2 marks· Biology Q1 1(d)(i)Based on the students' observation, suggest a hypothesis for the investigation.
92. 1(d)(ii)3 marks· Biology Q1 1(d)(ii)Describe the procedure to test for the presence of starch in a leaf taken from a green plant.
93. 1(d)(ii)2 marks· Biology Q1 1(d)(ii)Suggest why this may be so.
94. 1(d)(ii)1 mark· Biology Q1 1(d)(ii)Explain the importance of stirring the mixture.
95. 1(d)(ii)2 marks· Biology Q1 1(d)(ii)How is the starch produced in leaves converted to a substance which can be transported to other parts of the plant?
96. 1(d)(ii)4 marks· Biology Q1 1(d)(ii)Describe the investigation you would undertake to test the hypothesis you suggested in (d)(i). Include in your description the apparatus, materials and method you would use.
97. 1(d)(ii)1 mark· Biology Q1 1(d)(ii)State the name used to describe the mode of nutrition in plants.
98. 1(d)(ii)2 marks· Biology Q1 1(d)(ii)Name TWO inorganic substances (mineral elements) required by plants to make their food.
99. 1(d)(iii)2 marks· Biology Q1 1(d)(iii)Explain why plants store most carbohydrates in the form of starch instead of in the form of a reducing sugar.
100. 1(d)(iii)1 mark· Biology Q1 1(d)(iii)Give ONE benefit of the storage of starch in plants.
101. 1(d)(iii)2 marks· Biology Q1 1(d)(iii)State TWO environmental factors that affect the rate of photosynthesis.
102. 1(d)(iv)4 marks· Biology Q1 1(d)(iv)Suggest TWO reasons why it is important for plants to store starch.
103. 1(d)(iv)3 marks· Biology Q1 1(d)(iv)Write an equation to adequately represent the processes involved in photosynthesis.
104. 1(e)8 marks· Biology Q1 1(e)Complete Table 1 to distinguish between photosynthesis and aerobic respiration.
105. 1(e)4 marks· Biology Q1 1(e)Minerals are required for good nutrition in plants. Name TWO minerals used by plants and state the function of EACH mineral named.
106. 1(e)(i)2 marks· Biology Q1 1(e)(i)Suggest TWO ways in which the growth of the corn plant would be different over the 36 days, if the soil in which it grew were deficient in nitrogen and magnesium.
107. 1(e)(i)1 mark· Biology Q1 1(e)(i)How should the cotyledons be prepared for testing?
108. 1(e)(i)2 marks· Biology Q1 1(e)(i)Describe how the club members could determine the presence of TWO named nutrients in the yam-bean fruit.
109. 1(e)(ii)2 marks· Biology Q1 1(e)(ii)Explain how a lack of EACH of the following elements may result in the differences suggested in (e)(i) above: Nitrogen; Magnesium.
110. 1(e)(ii)2 marks· Biology Q1 1(e)(ii)State the expected food test results if the nutrients you chose in (e) (i) are present in the fruit.
111. 2(a)3 marks· Biology Q2 2(a)Complete Table 2 by listing the final digestive products of the three macronutrients.
112. 2(a)5 marks· Biology Q2 2(a)Name the parts labelled A, B, C, D and E in Figure 2.
113. 2(a)(i)5 marks· Biology Q2 2(a)(i)Identify the structures labelled I, II, III, IV and V in Figure 3. I: II: III: IV: V:
114. 2(a)(i)3 marks· Biology Q2 2(a)(i)Complete the labelling of the boxes in Figure 2.
115. 2(a)(ii)4 marks· Biology Q2 2(a)(ii)Place the symbols (P, R, S and T) in the boxes in Figure 2 where the respective activities described below take place: P: Completion of digestive processes R: Production of an acidic pH S: Absorption of large quantities…
116. 2(a)(ii)2 marks· Biology Q2 2(a)(ii)Using the symbol, X, indicate on Figure 3, TWO places where protein digestion takes place.
117. 2(a)(iii)1 mark· Biology Q2 2(a)(iii)Draw ONE arrow on the diagram in Figure 2 to show where digested food is taken.
118. 2(a)(iii)2 marks· Biology Q2 2(a)(iii)Suggest TWO reasons why the locations indicated in (a)(ii) are suitable for protein digestion to take place.
119. 2(a)(iv)1 mark· Biology Q2 2(a)(iv)Name the part of the plant in Figure 1 that is responsible for Obtaining water and mineral salts.
120. 2(a)(iv)2 marks· Biology Q2 2(a)(iv)Give TWO reasons why living organisms need protein.
121. 2(a)(v)1 mark· Biology Q2 2(a)(v)Name the part of the plant in Figure 1 that is responsible for Making food for the plant.
122. 2(b)3 marks· Biology Q2 2(b)Suggest THREE ways in which Part B in Figure 2 is adapted for its functions.
123. 2(b)6 marks· Biology Q2 2(b)Identify THREE products into which food is converted during the digestive process and give a function of EACH of the products identified.
124. 2(b)(i)2 marks· Biology Q2 2(b)(i)Write a chemical equation and a word equation to summarize EACH of the following processes: Photosynthesis
125. 2(b)(ii)4 marks· Biology Q2 2(b)(ii)Explain TWO ways in which the type of nutrition carried out by the organism named in (b)(i) is different from that carried out by plants.
126. 2(b)(ii)2 marks· Biology Q2 2(b)(ii)Suggest TWO signs of nitrogen deficiency in plants.
127. 2(c)3 marks· Biology Q2 2(c)Humans have an omnivorous diet. Suggest how the human digestive system is adapted to break down the different types of food that humans eat.
128. 2(c)2 marks· Biology Q2 2(c)Suggest ONE reason why a plant may also need to regulate its temperature.
129. 2(c)(i)3 marks· Biology Q2 2(c)(i)Explain the role of the pancreas in the digestion of food.
130. 2(c)(ii)1 mark· Biology Q2 2(c)(ii)Suggest a mineral supplement that is likely to be recommended for people suffering from osteoporosis.
131. 2(d)(i)2 marks· Biology Q2 2(d)(i)State the digestive functions of the liver and the pancreas in a human.
132. 2(d)(ii)2 marks· Biology Q2 2(d)(ii)Suggest TWO consequences of the malfunctioning of the pancreas.
133. 3(a)2 marks· Biology Q3 3(a)Name ONE function for which the leaf in Figure 4 is suited and suggest how it is BEST suited for that function.
134. 3(a)4 marks· Biology Q3 3(a)Using ALL the available data, describe the changes in carbon dioxide concentration shown in Figure 3.
135. 3(a)(i)5 marks· Biology Q3 3(a)(i)Identify the structures labelled I, II, III, IV and V in Figure 2. Write your answers in the spaces provided in Figure 2.
136. 3(a)(ii)2 marks· Biology Q3 3(a)(ii)State ONE function of EACH of the structures labelled I and IV.
137. 3(b)(i)2 marks· Biology Q3 3(b)(i)Identify the TWO plant processes that affect the amount of carbon dioxide in the atmosphere.
138. 3(b)(i)2 marks· Biology Q3 3(b)(i)Sometimes roots develop as storage organs. Suggest TWO reasons why a plant may need to store food.
139. 3(b)(ii)2 marks· Biology Q3 3(b)(ii)Explain the changes taking place in the carbon dioxide concentration over the forest between 4.00 a.m. and 4.00 p.m.
140. 3(b)(ii)2 marks· Biology Q3 3(b)(ii)Identify the structures labelled 1 and 2. Structure 1: Structure 2:
141. 3(c)2 marks· Biology Q3 3(c)If all the cells in a plant appear like the one drawn in (b) on page 7, the plant's ability to photosynthesize will be reduced. Explain why photosynthesis will be reduced.
142. 3(c)3 marks· Biology Q3 3(c)The alveolus has a function similar to that of a dicotyledonous leaf. State THREE ways by which a dicotyledonous leaf is adapted to carry out this function.
143. 3(c)(i)1 mark· Biology Q3 3(c)(i)What environmental factor was MAINLY responsible for the changes which were seen in the graph in Figure 3?
144. 3(c)(i)2 marks· Biology Q3 3(c)(i)State TWO environmental factors that are necessary for photosynthesis to occur.
145. 3(c)(ii)4 marks· Biology Q3 3(c)(ii)Explain how the factor you named at (c)(i) was responsible for the changes observed over the 24-hour period.
146. 4(a)6 marks· Biology Q4 4(a)With the aid of a balanced equation, describe the process by which green plants make their food.
147. 4(a)4 marks· Biology Q4 4(a)Describe the process by which carbon dioxide and water are made into carbohydrates by green plants.
148. 4(a)2 marks· Biology Q4 4(a)Describe TWO ways in which a leaf is adapted for the process of photosynthesis.
149. 4(a)6 marks· Biology Q4 4(a)Identify the structures labelled P, Q and R in Figure 5 and state the role of EACH in photosynthesis. P Role Q Role R Role
150. 4(a)10 marks· Biology Q4 4(a)With the aid of a labelled diagram of the human alimentary canal, explain how a sandwich consisting of bread and chicken is digested to supply the body with nutrients.
151. 4(a)5 marks· Biology Q4 4(a)Describe photosynthesis in green plants.
152. 4(b)3 marks· Biology Q4 4(b)With the aid of a fully annotated diagram, explain how the visible external features of a green dicotyledonous leaf aid the process of photosynthesis.
153. 4(b)4 marks· Biology Q4 4(b)Describe ONE difference in the cuticles and ONE difference in the lower epidermis of the two plants, A and B, and explain the significance of these differences.
154. 4(b)4 marks· Biology Q4 4(b)Identify TWO mineral salts found in garden soil and explain the role of EACH salt.
155. 4(b)(i)7 marks· Biology Q4 4(b)(i)Make a large, clearly labelled drawing to show the distribution of green and non-green areas of one leaf that the student may have used.
156. 4(b)(i)4 marks· Biology Q4 4(b)(i)Tomato plants infested with a population of caterpillars
157. 4(b)(i)2 marks· Biology Q4 4(b)(i)Name TWO storage organs in plants and the nutrients stored in EACH.
158. 4(b)(ii)1 mark· Biology Q4 4(b)(ii)Water plants rooted to the bottom of a pond in which there is a proliferation (sudden large population) of algae
159. 4(b)(ii)1 mark· Biology Q4 4(b)(ii)Indicate, on the same drawing, the part expected to change colour if the leaf had photosynthesized.
160. 4(b)(ii)3 marks· Biology Q4 4(b)(ii)Suggest THREE reasons why plants need to store nutrients.
161. 4(b)(iii)1 mark· Biology Q4 4(b)(iii)Describe the colour change expected if the leaf tested positive for starch.
162. 4(c)3 marks· Biology Q4 4(c)Suggest THREE factors or conditions which determine whether plants store either very little or very much of the food they make.
163. 4(c)5 marks· Biology Q4 4(c)Suggest the type of environment in which each plant, Plant A and Plant B would be found growing, and THREE adaptations expected in Plant B, other than those shown in Figure 5. Environment for Plant A Environment for…
164. 4(c)4 marks· Biology Q4 4(c)Explain how this investigation could indicate that chlorophyll is needed for photosynthesis. Include the role of chlorophyll in your explanation.
165. 4(c)(i)5 marks· Biology Q4 4(c)(i)How does the use of fertilisers increase crop yield?
166. 4(c)(ii)3 marks· Biology Q4 4(c)(ii)Explain how this type of nutrition differs from photosynthesis.
167. 4(d)4 marks· Biology Q4 4(d)There are advantages and disadvantages when leaves fall from plants. Suggest TWO advantages and TWO disadvantages to a plant, when leaves fall from it.
168. 4(d)2 marks· Biology Q4 4(d)Give an explanation for the presence of starch in the parts of a plant that do NOT contain chlorophyll.
169. 5(a)11 marks· Biology Q5 5(a)With the aid of a chemical equation, explain what is meant by the term 'photosynthesis', and discuss how a dicotyledonous leaf is adapted to capture maximum sunlight and carbon dioxide for the process.
170. 5(a)6 marks· Biology Q5 5(a)Describe the chemical digestion of carbohydrates, fats and proteins from the mouth until they are absorbed in the small intestines.
171. 5(a)(i)9 marks· Biology Q5 5(a)(i)Draw a simple diagram in the box below to show the relative positions of the following organs of the human digestive system: Mouth/oesophagus, Stomach, Liver, Pancreas, Small intestine.
172. 5(a)(ii)1 mark· Biology Q5 5(a)(ii)Annotate the diagram to show the functions of any FOUR of the organs.
173. 5(a)(ii)3 marks· Biology Q5 5(a)(ii)Explain how nitrates from the soil become protein in plants and animals.
174. 5(a)(ii)2 marks· Biology Q5 5(a)(ii)State TWO consequences of nitrogen deficiency in plants.
175. 5(a)(iii)1 mark· Biology Q5 5(a)(iii)The alimentary canal in humans is designed for a varied diet, yet some people choose to become vegetarians. Suggest how vegetarians can make up for any limitations associated with their diet.
176. 5(b)4 marks· Biology Q5 5(b)Certain organs associated with digestion, for example, the pancreas, also have endocrine functions. How would removal of the pancreas affect its endocrine function?
177. 5(b)(i)4 marks· Biology Q5 5(b)(i)Describe how the body systems work together to assimilate glucose molecules.
178. 5(b)(i)2 marks· Biology Q5 5(b)(i)What is the advantage to a plant of having large flowers and large leaves?
179. 5(b)(ii)5 marks· Biology Q5 5(b)(ii)Explain how the assimilation of glucose by a non-diabetic person differs from that of a person suffering from diabetes.
180. 5(c)2 marks· Biology Q5 5(c)Although plants make their own food, they may suffer from deficiency diseases. Explain how deficiency diseases are likely to arise in plants.
181. 6(a)3 marks· Biology Q6 6(a)State the name of the final products of digestion for EACH of the following types of nutrients: Carbohydrate, Protein, Fat/lipid.
182. 6(a)6 marks· Biology Q6 6(a)With the aid of an annotated diagram, describe the functions of the enamel, dentine and pulp of a named tooth.
183. 6(a)(iii)6 marks· Biology Q6 6(a)(iii)Name TWO factors that may affect the activity of these enzymes.
184. 6(b)3 marks· Biology Q6 6(b)Suggest THREE ways having a varied diet is beneficial to a mammal.
185. 6(b)3 marks· Biology Q6 6(b)In addition to the macronutrients in (a), list three other types of nutrients in a diet that would promote the maintenance of good health.
186. 6(c)6 marks· Biology Q6 6(c)Explain how this might affect his ability to digest food and suggest how he could obtain the essential nutrients that his body requires.
187. 6(c)(ii)3 marks· Biology Q6 6(c)(ii)Explain why Mary is advised to limit her consumption of simple carbohydrates.
188. 1(a)2 marks· CSEC Biology · January 2021 · Paper 2State TWO reasons why enzymes are referred to as 'biological catalysts'.
189. 1(b)(i)4 marks· CSEC Biology · January 2021 · Paper 2Record the results presented on the graph in Figure 1 in a suitable table.
190. 1(b)(ii)4 marks· CSEC Biology · January 2021 · Paper 2With reference to the rate of enzyme activity, suggest TWO reasons for the shape of the graph during EACH of the following pH ranges: pH 4-5 and pH 6-8.
191. 1(b)(iii)1 mark· CSEC Biology · January 2021 · Paper 2Suggest ONE reason why the graph has a 'U' shape.
192. 1(b)(iv)1 mark· CSEC Biology · January 2021 · Paper 2Predict how many seconds it would take for amylase to completely break down starch at pH 5.5 using the graph in Figure 1.
193. 1(b)(v)1 mark· CSEC Biology · January 2021 · Paper 2Determine the optimum pH of amylase using the graph in Figure 1.
194. 1(b)(vi)1 mark· CSEC Biology · January 2021 · Paper 2Predict the pH at which amylase would completely break down starch in 80 seconds.
195. 1(c)5 marks· CSEC Biology · January 2021 · Paper 2With reference to Figure 1 on page 4, describe a suitable procedure that can be used to investigate the effect of pH on the time taken for amylase to digest starch.
196. 1(d)2 marks· CSEC Biology · January 2021 · Paper 2Suggest TWO ways in which mammals can decrease the time they take to break down food molecules if the food molecule is too large.
197. 1(e)2 marks· CSEC Biology · January 2021 · Paper 2Complete Table 1 by identifying the deficiency disease associated with Vitamin C and the vitamin/mineral deficient when there is abnormal clotting of the blood.
198. 2(a)(i)4 marks· CSEC Biology · January 2021 · Paper 2Name the structures labelled A, B, C and D on Figure 2.
199. 2(a)(ii)1 mark· CSEC Biology · January 2021 · Paper 2Suggest ONE way in which photosynthesis would be affected if ALL of the air spaces in the leaf of the flowering plant were filled with cells.
200. 2(b)3 marks· CSEC Biology · January 2021 · Paper 2List THREE ways in which the leaf of a plant is adapted for photosynthesis.
201. 2(d)(i)1 mark· CSEC Biology · January 2021 · Paper 2Describe the region of the line of the graph labelled A in Figure 3.
202. 2(d)(ii)1 mark· CSEC Biology · January 2021 · Paper 2Use the principles of photosynthesis to suggest ONE reason for the shape of the graph in the region A.
203. 2(d)(iii)1 mark· CSEC Biology · January 2021 · Paper 2Describe the region of the line of the graph labelled A-B in Figure 3.
204. 2(e)2 marks· CSEC Biology · January 2021 · Paper 2Despite the increase in the global concentrations of atmospheric carbon dioxide, there is no corresponding increase in the rate of photosynthesis in flowering plants. Suggest ONE reason for this observation.
205. 1(a)4 marks· CSEC Biology · May/June 2021 · Paper 2Name the two raw materials and state the two conditions necessary for photosynthesis.
206. 1(b)(i)3 marks· CSEC Biology · May/June 2021 · Paper 2On the grid provided on page 5, make a drawing of the leaf that is twice the size of Figure 1.
207. 1(b)(ii)3 marks· CSEC Biology · May/June 2021 · Paper 2On the drawing made on page 5, label each of the specified parts: apex, lamina, midrib, petiole.
208. 1(d)3 marks· CSEC Biology · May/June 2021 · Paper 2Suggest three reasons why there is still a need for green plants to store food even though they produce food by photosynthesis.
209. 1(e)3 marks· CSEC Biology · May/June 2021 · Paper 2Suggest three reasons why glucose, the initial carbohydrate product of photosynthesis, is not stored in green leaves.
210. 1(f)3 marks· CSEC Biology · May/June 2021 · Paper 2Describe the test that could be used to determine if a green leaf has stored starch.
211. 1(g)4 marks· CSEC Biology · May/June 2021 · Paper 2Explain two ways in which the human digestive system is adapted for the mechanical digestion of food.