SCIENCE SPM MODULE 2

Transcription

1 SCIENCE SPM MODULE 2 PAPER 1 1. What is the name of the fine thread-like structure found in the nucleus of the cell? A Gene B Chromosome C Cell membrane D Nuclear membrane 2. The chromosomes present in the female skin cells are A 22 + Y B 22 + X C 44 + XX D 44 + XY 3. Diagram shows the different phases in cell division in mitosis. Which is the correct sequence in the mitosis? A P, Q, R, S B S, P, R, Q C R, S, Q, P D Q, R, P, S 12

2 4. Which part of a plant does meiosis occur? A Root B Shoot C Anther D Stigma 5. What is the function of cell division through meiosis? A Produces more siblings B Replaces damaged tissues C Increases the size of an organism D Creates variation in a population of organisms 6. What type of cell division process human occurs only in the reproductive organs? A Mitosis B Meiosis C Mutation D Fertilization 7. Diagram shows the inheritance of human height. Father Mother Which offspring has a correct pair of genes? Offspring Pair of genes A P Tt B Q TT C R TT D S tt

3 8. The graph shows an example of variation among the pupils in a class. Another example of the same type of variation is A blood group B body weight C type of fingerprint D type of ear lobes 9. Which is caused by gene mutation? A Colour blindness B Down s syndrome C Turner s syndrome D Klinefelter s syndrome 14

4 10. Diagram shows a cell division process. Which of the following statement is true about the process? A Produce gamete B Occur in somatic cells C The cell divide once only D The number of chromosomes in daughter cells are two

5 PAPER 2 1. Diagram 1 shows some stages of a cell division occurring in humans. Stage K Stage L Stage M DIAGRAM 1 (a) What type of cell division is this?..... (b) What happens at Stage L? (c) Name two organs in humans where this cell division occurs. (d) State one reason for the importance of this cell division. [2 marks]. (e) State one sections of a plants which experiences this cell division

6 2. Diagram 2 shows the abnormal chromosomes arrangement that can be found in human. DIAGRAM 2 (a) How many chromosomes in the Diagram 2? (b) Name one disease due to the genetic disorder in Diagram 3? (c) State one symptom of the disease in 3(b)? (d) State either male or female will get this disease? [ 1 mark]

7 (e) Tick () the disease caused by gene mutation. Albinism Albino Down Syndrome Sindrom Down Colour Blindness Buta Warna [2 marks] 3. (a) State four differences between cell division through mitosis and meiosis. [4 marks] (b) The cell division that takes place in the body parts of a student is shown above. Explain how you would build a concept based on the information above. Your explanation should include the following. (i) Identify two common features (ii) Build an initial concept (iii) Give one example of body part that undergoes this cell division and one example of body part that does not undergo this cell division. Give reason for each example. (iv) Explain the actual concept [6 marks] 18

8 MODULE 2 - ANSWERS 1. B 2. C 3. D 4. C 5. D 6. B 7. D 8. B 9. A 10. D 1. (a) Meiosis (b) Replication of chromosome // Exchange genetic materials (c) Testis and ovary (d) To produce gametes // ensure the number of chromosomes in an organisms being kept constant from one generation to another generation. (e) Anther // ovary 2. (a) 45 chromosomes (b) Turner s Syndrome (c) Under develop ovary // no menstrual cycle // sterile (d) Female (e) Albinism Down Syndrome Albino Sindrom Down Colour Blindness Buta Warna

9 a) Mitosis Cell division happens once Crossing over does not occur Two new cells are produced The number of chromosomes in progeny is similar to parent cell Meiosis Cell division happens twice Crossing over occur Four new cells are produced The number of chromosomes in progeny is half of the parent cell b) Two common characteristics Initial concept Other example Non-example Actual concept cell division occurs in somatic cell cell division produces two daughter cells cell division for growth Cell division which occurs in somatic cells and produces two daughter cells is mitosis Heart because it is a somatic cell Testis / Ovary because it is a reproductive cell Mitosis is cell division which occurs in somatic cells and produces two daughter cells 20