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IGCSE Co-ordinated SciencesBiology Portion Revision Questions

Name: ……………………………………………………………

COORDINATED SCIENCE – BIOLOGY PORTION 0654/3

Paper 3 (Extended) January/February 2012

75 MinutesCandidates 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 24.

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.

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1 (a) Translocation and transpiration are processes that occur in plants.

Describe each of these processes.

translocation............................................................................................................

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transpiration............................................................................................................

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(b) Fig. 1.1 shows an investigation that was set up and left for 30 hours.

At the end of this time, the leaf had become red.

Fig. 1.1

Suggest an explanation for this result.

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(c) Describe the effects of variation of; temperature, humidity and light intensity on rate of transpiration.

temperature..............................................................................................................

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humidity....................................................................................................................

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light intensity............................................................................................................

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2 A scientist monitors the heart rate of an athlete exercising on a running machine.Results of her experiment are shown in the table.

(a) (i) Plot these results on the grid. [2]

(ii) Draw a line of best fit. [1]

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(b) Use your graph to predict the heart rate of this athlete when he is running at a speed of 12 km / h.

heart rate = .................... beats per minute [1]

(c) The heart pumps blood around the body. This supplies oxygen for aerobic respiration in the body cells.

(i) How is oxygen carried in the blood?

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(ii) Write a word equation for aerobic respiration.

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(iii) Use ideas about aerobic respiration to explain the shape of the graph.

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3 (a) State the functions of five named parts of the male reproductive system.

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(b) (i) Explain how sperm, deposited in the vagina during sexual intercourse,

reach an egg.

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(ii) Describe the advantages of breastfeeding compared to bottle-feeding using the formula milk.

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(c) Outline the ways in which HIV can be prevented from spreading.

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4 (a) Fig. 4.1 shows the structures involved in a reflex arc.

Fig. 4.1

(i) On Fig. 4.1 label structures A, B, C and D.

Write your answers on Fig. 4.1. [4]

(ii) Name the two types of tissue in the body that can act as effectors.

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(b) (i) Describe the characteristics of a reflex action resulting from the activity of structures A, B, C and D.

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(ii) State one examples of a reflex action.

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(c) Complete the paragraph below.

A human exposed to a severe shock responds by producing the hormone

………………………………. This hormone causes the storage polysaccharide

……………………... to be converted to ……………………, a soluble sugar used

to release energy via respiration. Aerobic respiration requires …………………..

as well as this sugar, and more of this gas is made available because the

hormone causes ………………………. and ………………………… breathing.

The body makes the most of its resources by adjusting blood flow to different

organs – less blood flows to the …………………….., for example, and more flows

to the ………………………………… . The face of a shocked person shows three

effects of this hormone – the skin …………….………, the pupils

……………………..and the hair …………………….. Because of these effects this

hormone is often called the ………………….. or …………….hormone. [10]

5 (a) Explain the meaning of the terms genotype and phenotype.

Genotype.................................................................................................................

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phenotype................................................................................................................

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(b) Complete the following passage using only words from the list below.

diploid gametes haploid meiosis mitosis

red blood cells

The transfer of inherited characteristics to new cells and new individuals depends on two types of cell division.

During ..............................................., the chromosomes are duplicated exactly

and............................................... cells are produced. However,

during ..............................................., the chromosome sets are first duplicated

and then halved producing............................................... cells. These cells will

become............................................... . [5]

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(c) Using a labelled, genetic diagram, explain the inheritance of the sex in humans.

[4]

(d) Two red flowered plants were crossed. The seeds produced were germinated and grew into 62 white flowered plants and 188 red flowered plants.

(i) Which flower colour is controlled by the recessive form of the gene?

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(ii) Using the symbols R and r, construct a genetic diagram to explain the results of this cross.

[4]

(iii) One of the white flowered offspring was crossed with a red flowered offspring. Predict the two possible ratios of red and white flowered plants that their seeds would produce.

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2 …………………………………………………………….………………… [2]