UNIQUE SCIENCE ACADEMY

Transcription

1 1 (a) UNIQUE SCIENCE ACADEMY Test (Unit 7) Name :... Paper: Biolog y Date :... Code: 5090 Class: CII Time Allowed: 35Minutes Maximum Marks: 25 1 Theory Section: [Total 18 Marks] Translocation and transpiration are processes that occur in plants. Describe each of these processes. translocation... transpiration... (b)...[4] Fig. 1.1 shows an investigation that was set up and left for 30 hours. pale green leaf leaf stalk red dye Fig. 1.1 At the end of this time, the leaf had become red. Suggest an explanation for this result....[2] [Total : 6] Dedicated to My Son Mohammad Irtaza Haider Zain. Code 5090 [Turn over

2 2 2 In an experiment to investigate starch production by a plant, three similar plants, each with variegated (green and white) leaves were set up as shown in Fig percentage of carbon dioxide in the jars after 6 hours 0.03 % sunlight 0.00 % 0.05 % green white well-watered potted plant with variegated leaves Jar L Jar M substance Jar N to absorb carbon dioxide Fig. 2.1 black cover (a) Name the process that produces starch in the leaves.... [1] (b) At the start of the experiment, each jar contained atmospheric air. Name a gas, other than oxygen and carbon dioxide, which was present in the air inside the jars.... [1] (c) Explain how the conditions in Jar L make it a control....[1] Dedicated to My Son Mohammad Irtaza Haider Zain. Code 5090 [Turn over

3 3 (d) At the end of the experiment, a leaf was taken from each plant and tested for the presence of starch. On the outlines in Fig. 2.2, clearly label the colours of each leaf after the starch test. Do not colour in the leaves. (e) leaf from L leaf from M leaf from NA Fig. 2.2 [3] When the air was first trapped under the jars, it contained 0.04% carbon dioxide. For each of the jars, explain why this percentage has changed by the end of the experiment. Jar L... Jar M... Jar N [6] [Total: 12] MCQ SECTION: [Total 7 Marks] A young plant may wilt when dug up and re-planted in another place. What causes this? A B C D The leaves lose less water. The roots cannot take up mineral salts. The stem cannot transport water. The surface area of the root is reduced. Dedicated to My Son Mohammad Irtaza Haider Zain. Code 5090 [Turn over

4 4 2 The diagram shows an experiment to find out whether carbon dioxide is needed for photosynthesis. glass cover light plant soda lime (to remove carbon dioxide) 15 C Which is the most suitable control for this experiment? A B C D light light light black cover 25 C 15 C 15 C 15 C 3 a substance soda lime to remove oxygen The diagram shows four different ways in which plants use the sugars produced by photosynthesis. 1. making starch 4. making protein sugar 2. making cellulose 3. making chlorophyll Which process requires magnesium ions and which requires nitrate ions? magnesium ions nitrate ions A 1 2 B 2 3 C 3 4 D 4 1 Dedicated to My Son Mohammad Irtaza Haider Zain. Code 5090 [Turn over

5 5 4 The graph shows how the rate of photosynthesis in a plant varies with light intensity at two different carbon dioxide concentrations. The temperature is kept constant at 20 C. 1% carbon dioxide concentration rate of photosynthesis X 0.04% carbon dioxide concentration light intensity Which factor is limiting the rate of photosynthesis at point X? A carbon dioxide concentration C light intensity B chlorophyll availability D water availability 5 Which identifies the function of each type of plant cell? palisade cells phloem cells root hair cells A photosynthesis sugar transport ion uptake B photosynthesis sugar transport transpiration C transpiration photosynthesis ion uptake D transpiration photosynthesis sugar transport Dedicated to My Son Mohammad Irtaza Haider Zain. Code 5090 [Turn over

6 6 The diagram shows the shapes of the cells in a section of a leaf Which cells contain chloroplasts? A 1 and 2 C 2 and 3 only 3 B 2 only D 2, 3 and 4 Four tubes, A, B, C and D are left in sunlight for one hour. The bicarbonate indicator solution in each tube is red at the start of the experiment. Bicarbonate indicator solution stays red if there is no change in carbon dioxide concentration. The indicator goes yellow if carbon dioxide concentration increases and purple if the carbon dioxide concentration decreases. In which tube does the colour change to purple? A B C D pond weed pond weed snails pond weed and snails bung aluminium foil cover boiling tube MCQ Answer Sheet 1 A B C D 2 A B C D 3 A B C D 4 A B C D bicarbonate indicator solution 5 A B C D 6 A B C D 7 A B C D Dedicated to My Son Mohammad Irtaza Haider Zain. Code 5090