Igcse Combined Science Past Paper Paper 2 0653/21 October/November 2010
UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education
*1144188971*
COMBINED SCIENCE Paper 2 (Core)
0653/21
October/November 2010 1 hour 15 minutes
Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs, tables or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. A copy of the Periodic Table is printed on page 20. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner's Use 1 2 3 4 5 6 7 8 9 Total
This document consists of 20 printed pages.
IB10 11_0653_21/4RP © UCLES 2010
[Turn over
2 1 (a) State the word equation for photosynthesis.
For Examiner's Use
+
+
[2]
(b) (i) Name the green pigment found in plant leaves which absorbs energy from sunlight. [1] (ii) Fig. 1.1 is a diagram of a plant cell. On the diagram, draw a label line to where this green pigment would be found, and label it P.
Fig. 1.1
[1]
© UCLES 2010
0653/21/O/N/10
3 (c) A student fixed a piece of black paper over a leaf, which was still attached to the plant. He left the plant in the sun for two days. He then removed the leaf from the plant and tested it for starch, after removing the paper. (i) Using the letters given, list the correct sequence of the steps he took. A Add iodine solution to the leaf.
For Examiner's Use
B
Place the leaf in boiling water.
C
Dip the leaf into water to soften it.
D
Place the leaf in hot ethanol.
E
Spread the leaf on a white tile. [3]
(ii) Fig. 1.2 shows the leaf before and after he did the starch test.
black paper
before testing
after testing
Fig. 1.2 Iodine solution
*1144188971*
COMBINED SCIENCE Paper 2 (Core)
0653/21
October/November 2010 1 hour 15 minutes
Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs, tables or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. A copy of the Periodic Table is printed on page 20. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner's Use 1 2 3 4 5 6 7 8 9 Total
This document consists of 20 printed pages.
IB10 11_0653_21/4RP © UCLES 2010
[Turn over
2 1 (a) State the word equation for photosynthesis.
For Examiner's Use
+
+
[2]
(b) (i) Name the green pigment found in plant leaves which absorbs energy from sunlight. [1] (ii) Fig. 1.1 is a diagram of a plant cell. On the diagram, draw a label line to where this green pigment would be found, and label it P.
Fig. 1.1
[1]
© UCLES 2010
0653/21/O/N/10
3 (c) A student fixed a piece of black paper over a leaf, which was still attached to the plant. He left the plant in the sun for two days. He then removed the leaf from the plant and tested it for starch, after removing the paper. (i) Using the letters given, list the correct sequence of the steps he took. A Add iodine solution to the leaf.
For Examiner's Use
B
Place the leaf in boiling water.
C
Dip the leaf into water to soften it.
D
Place the leaf in hot ethanol.
E
Spread the leaf on a white tile. [3]
(ii) Fig. 1.2 shows the leaf before and after he did the starch test.
black paper
before testing
after testing
Fig. 1.2 Iodine solution