stpm 2012 trial biology paper 2 964/2
DESCRIPTION
Specially dedicate for the candidates who're taking STPM examination this year.It is a spot question that recombinate every state Biology trial paper.All the best!TRANSCRIPT
1*CONFIDENTIAL 964/2
Name: ___________________________________________ Form: _______________
UPPER SIX FORM
(TINGKATAN ENAM ATAS)
STPM TRIAL EXAM
(PEPERIKSAAN PERCUBAAN STPM)
Instructions to candidates:
DO NOT OPEN THIS QUESTION PAPER UNTIL YOU ARE TOLD TO DO SO.
Answer all questions in Section A. Write your answer in the space provided.
Answer any four questions in Section B. Write your answers on the answer sheets provided. Begin each answer on a fresh sheet of paper and arrange your answers in numerical order. Tie your answer sheets to this question paper.
Answers should be illustrated by large and clearly labeled diagrams wherever suitable.
Answers may be written in either English or Bahasa Malaysia.
Arahan kepada calon:
JANGAN BUKA KERTAS SOALAN INI SEHINGGA ANDA DIBENARKAN BERBUAT DEMIKIAN.
Jawab semua soalan dalam Bahagian A. Tulis jawapan anda dalam ruang yang disediakan.
Jawab mana-mana empat soalan dalam Bahagian B. Tulis jawapan anda pada helaian jawapan yang dibekalkan. Mulakan setiap jawapan anda pada helaian kertas yang baharu dan susun jawapan anda mengikut terbit berangka. Ikat helaian jawapan anda bersama dengan kertas soalan ini.
Jawapan hendaklah disertai gambar rajah yang besar dan mempunyai label yang jelas di mana-mana yang sesuai.
Jawapan boleh ditulis dalam Bahasa Inggeris atau Bahasa Melayu.964/2*This question paper is CONFIDENTIAL until the examination is over. CONFIDENTIAL*
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Section A [40 marks]
Answer all questions in this section.
1. The diagram below shows some morphological characteristics of a species, X.
(a) State the taxonomic hierarchy belonging for species X. [3 marks]
Phylum : ________________________________________________________
Class : ________________________________________________________
Order : ________________________________________________________
(b) Give an example for the animal that belongs to the order stated in 1(a). [1 mark]
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(c) Species Y is an animal that belongs to the same phylum as species X. However, it
has a lot of legs by 2 pairs of legs per segment.
i. Identify Y. [1 mark]
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ii. State the subphylum and class that Y belongs to. [2 marks]
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iii. State 3 other morphological characteristics of Y. [3 marks]
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964/2*This question paper is CONFIDENTIAL until the examination is over. CONFIDENTIAL*
Has 1 pair of antenna Has 3 pair of appendages Bilaterally symmetrical Able to undergo haploid parthenogenesis Body parts are divided into head, thorax and abdomen
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2. Homeostasis is aided by negative feedback and positive feedback mechanisms.(a) Define homeostasis. [1 mark]
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(b) Give an example for both negative and positive feedback controlled mechanisms.[2 marks]
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(c) Describe the mechanisms that help to control blood sodium level in human.[4 marks]
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(d) Describe the roles played by mammalian kidney in blood pH regulation.[3 marks]
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3. Sickle cell anaemia is an example of gene mutation where the person suffers from this disease lacks of the efficiency in transporting oxygen to the other part of the body. The diagram below shows the erythrocytes that are obtained from the sickle cell anaemia patient.
(a) Describe the structure of haemoglobin that is found in an erythrocyte of a normal person. [4 marks]__________________________________________________________________
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(b) Describe how sickle cell anaemia can occur. [3 marks]
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(c) Heterozygous individuals are more resistant to malaria in certain regions in Africa and Asia where malaria in endemic.
i. Explain this statement. [2 marks]____________________________________________________________
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ii. Name the type of natural selection that is shown by the above situation. [1 mark]
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4. DNA fingerprinting was first developed by Dr Alec Jeffreys in1984 based on restriction fragment length polymorphism (RFLP).
(a) Explain what is meant by restriction fragment length polymorphism. [2 marks]__________________________________________________________________
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(b) Describe the steps that are required to obtain DNA fingerprint. [5 marks]__________________________________________________________________
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(c) State three applications of DNA fingerprinting in forensic field. [3 marks]__________________________________________________________________
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Section B [60 marks]
Answer any four questions in this section.
5. ATP is an essential compound to store energy temporarily in cell. When energy is
required by the cell, ATP is hydrolyzed to release energy.
(a) Briefly describe the structure of the organelle that aids in the main production of
ATP in eukaryotic cell. [6 marks]
(b) Outline the mechanisms for chemiosmosis to explain the synthesis of ATP in
oxidative phosphorylation. [5 marks]
(c) Carbon monoxide is a respiratory poisonous gas. Explain how it affects cellular
respiration. [4 marks]
6. Replication of DNA is semiconservative.
(a) Based on the statement above, describe an experiment to demonstrate the
replication of DNA is semiconservative. [9 marks]
(b) Describe how DNA replicates semiconservatively. [6 marks]
7. (a) Explain how an action potential is generated and transmitted along the axon.
[9 marks]
(b) Compare the mechanism of impulse transmission across synapse and along axon.
[6 marks]
8. (a) Explain how hormones in insects are regulated in ecdysis. [6 marks]
(b) By using suitable examples, explain hibernation, aestivation and diapause.
[9 marks]
9. (a) Describe the roles of the hormones giberellins, cytokinis and abscisic acid in
plants growth. [9 marks]
(b) Explain why are phytocromes important in photoperiodism and flowering in plant.
[6 marks]
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10. (a) Define the two laws of thermodynamics. [2 marks]
(b) Describe sulphur cycle. [8 marks]
(c) Briefly describe the photosynthesis that occurs in sulphur bacteria. [5 marks]
END OF QUESTION PAPER
964/2*This question paper is CONFIDENTIAL until the examination is over. CONFIDENTIAL*
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Prepared by: Mr. Tan Wai Shan
964/2*This question paper is CONFIDENTIAL until the examination is over. CONFIDENTIAL*