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Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208
4601

(a) (i) identify specimens A. B, C, D and E (ii) To which class of fruits does each specimen belong? (iii) Give two reasons each for your answers (b) Examine specimen C carefully (i) State the agent of dispersal of specimen C (ii) Give one structural feature of specimen C carefully (iii) State the agent of dispersal of specimen C (iv) Give one structural feature of specimen C to support your answer (c) State two advantages of dispersal of fruit and seeds

View Answer & Discuss WAEC 1992
4602

                                                                                                 SECTION A

Answer all the questions in both sections

1. State the importance of the following elements to plants: (a) iron: (b) phosphorus (c) calcium (d) potassium

2. Give one example each of the following (a) plant parasite (b) saprophytic plant (c) carnivorous plant.

3. List two structural modifications each of one named bird which feeds on: (a) nectar, (b) flesh.

4. State three principles on which the use of the quadrat for determining population density is based on

5. (a) Name the nucleic acid that caries inherited traits (b) Name four elements found in the named nucleic acid.

6. Diagrams A and B below represent the reaction of some structures in the mammalian skin to different environmental conditions.

Open Photo

Use them to answer questions (a) and (b)

 

Open Photo

(a) Which of the diagrams represents tne reactions of the skin to cold condition? (b) List four observations from the diagrams to support your answer.

7. State three methods of controlling growth of micro- organisms.

8. In an experiment it was found that auxin was concentrated more on the shaded side of the shoot as shown in the diagram below

Open Photo

Use the diagram to answer questions (a) to (c): 

(a) From which direction did light reach the shoot? (b) Towards which of the directions, side A or side B will the tip grow? (c)Suggest a title for this experiment. Layer of trapped air Layer of- trapped air.

                                                                                                SECTION B

Answer all the questions

 9 Examine specimens A and B carefully, (a) State: (i) two similarities (ii) four differences. In structure between them (b) Make a labeled drawing 6-8 cm wide of the cut surface of specimen A.

10. (a) identify specimens C and D without giving reasons for your answer.

(b) In a tabular form state three differences in external features between specimens C and D.

(c) Remove a quill feather from specimen D and label it D. Make a fully labeled diagram 10 to 20 cm long of specimen D

(d) Explain how four observable features of specimen C adapt the organism to life in water. Shoot.

11. The amount of starch hydrolyzed by the enzyme ptyalin over a period of time at three different temperature are given in the table below

Time in Minutes

Volume of Starch hydrolyzed at different Temperature

 

15°C                                 25°C                           45°C

5

10.0cm\(^3\)                    21.5cm\(^3\)                4.0cm\(^3\)               

10

20.0 cm\(^3\)                    40.0 cm\(^3\)              6.5cm\(^3\)                                 

15

30.0 cm\(^3\)                    56.5cm\(^3\)               10.0cm\(^3\)

20

40.0 cm\(^3\)                     68.5cm\(^3\)               17.0cm\(^3\)                                         

25

50.0 cm\(^3\)                     70.0cm\(^3\)               19.0cm\(^3\)                                             

(a) Placing time on the horizontal axis and the amount of starch hydrolyzed on the vertical axis, plot the date given for the different temperatures on the sam graph (b) From the graph deduce the effect(s) of temperature on the action of ptyalin on starch (C) Calculate the amount of starch hydrolyzed at the (i) 7th minute at 15°C (ii) 12th minute at 25°C (i) 24th minute at 45°C.

View Answer & Discuss WAEC 1993
4603

                                                                                               SECTION A

Answer all questions in this section

1. In what direction does translocation occur in plants?

2. Name two tissues that are likely to be removed when a stem is removed

3. Name the last blood vessel that will transport glucose to the heart if glucose solution is injected through the arm (b) which chamber of the heart receive the glucose solution.

 4 Which part of the brain controls breathing? The Diagram  below illustrates two homologous chromosomes during meiosis. Use  it to answer question 5

5. Name those points labeled i (b)What is the Importance of those in evolution?  (c)  what is this  stage of melosis called?

Study diagrams i and ii below and use them to answer question 6

 

Open Photo

 

 

6. (a) Identify the organism illustrated in diagrams i and ii

   (b) State the levels of organization of i and ii

   (c) State a reason for placing i and ii in that level of organization.

        Study the diagram below and use it to answer question 7

Open Photo

7. (a) Name the parts labeled i to iv  (b) What is the function of the part labeled I?

         Study the diagram below and use it to answer questions 8 (a) and (b) 

8. (a) What is the set-up used for?  (b) Why is the leafy shoot cut under water when setting up the environment? (c) Name the instrument used for measuring water turbidity.

 

Open Photo

 

9. (a) Name three methods of preventing food spoilage.   Study the diagram below and use it to answer question 10 (a) and (b).

 

10. (a) Name the parts labeled i to iv (b) State the functions of the parts labeled ii and iv  (c) In which organ in the mammalian body is urea formed?

Open Photo

 

 

                                                                                               SECTION B

Answer all questions in this section

11. (a) You are provided with specimens A and B (a) (i). Cut a piece of Specimen A, put a drop of iodine on it then record your observation.

(ii) From your observation, what food nutrient does specimen A contain?      (ii) Give reasons for your answers 

      (b) Put a drop of specimen B on the top right hand corner of your question paper using a glass rod. Spread the drop. Clean the glass rod to remove every trace of specimen B. Allow both drops of specimen B and water to dry

      (i) Record your observation   (ii)   From your observation, what food nutrient does specimen B contain?      (ii) Give reasons for your answers.

   (c) Put 4cm\(^3\) of specimen B in a test tube and add 5cm\(^3\) of water.(i) Record your observation (ii) Shake the content thoroughly and leave it for 3 minutes to settle

         Record your observation. 

    (d) (i) Add 2cm\(^3\) of NaOH to 5cm\(^3\) of specimen B in a clean test tube. Shake thoroughly and observe the mixture.  Record your observation.

          (ii) What substance in the alimentary canal plays the same role during digestion in mammals as NaOH in this experiment?

12. You are provided with specimens C and D (a) Identify specimen C and D: (i) State the part to which each of the specimens C and D (ii) State two differences specimens C and D.

           (b) How can you propagate specimen C?  (ii)  Give one reason for your answer based on observable feature of specimen C

           (c) Make a labeled diagram 10-12cm long of specimen C to show its external features.

13. (a) identify specimens E and F (b) Suggest the agents of pollination of specimen E (c) Give  three reasons  for your suggestion in (b)

                In a tabular form, State three differences specimens E and F.  (e) with a sharp blade or scalpel cut a longitudinal section of specimen E to produce two equal parts of specimen E. Make a labeled drawing 10 cm to 12 cm, of one half ofspecimen E

 

 

 

 

 

 

 

 

View Answer & Discuss WAEC 1994
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4604

1. Name the blood vessel which carries blood away from the kidney.

2.What part of the brain controls temperature regulation in the body?

3.Name the process in mammal during which Urea is formed.

4. In the test for starch why is the green leaf boiled in (a) water; (b) alcohol?

5. Name four parts of the mammalian alimentary canal.

6 State two features which are peculiar to the atlas vertebra

7.  Name three diseases which can affect the kidney of man

8 Use the diagram below to answer questions (a) to (c) (a) (i)Name the structure illustrated above (ii) State the organ in which it is food

(b) Name the parts labeled HV (c) Name the fluid that is found within the parts of the structure labeled I - V

Open Photo

10. List the media of transportation of nutrients in: (a) Paramecium (c) invertebrates, (d) mammals

11. State two features which classify the rhizome as an underground stem.

                                                                                                SECTION B

Answer all the questions

12. You are provided with 10cm\(^3\) of water and a few crystals of potassium permanganate. Take two crystals with a spatula, bring the spatula close to the surface of tho water and gently drop that crystals into the water Do not stir the water or shake the test tube. (a) Carefully observe the set- up and record your observations as follows () Immediately after dropping the crystals into the water (i) after 5 minutes (ii) after 10 minutes (iv) after 15 minutes.

Copy the table below into your answer booklet and use it in recording your observations.

Time

Observation

Immediately after dropping the crystals

 

After 5 minutes

 

After 1O minutes

 

After 15 minutes

 

(b) What physical process must have given rise to the observations made? (c) State three physiological processes in organisms in which this phenomenon occurs

(ii) Why is it not advisable to stir the water or shake the beaker in this experiment?

13. (a) identify specimen. A and B (b) What type of skeleton has specimen A? (c) What is this skeleton made of? (d) From what group of animals can specimen B be collected? (e) From what part of the animal is it found? (f)(i) Make a labeled drawing 8 to 12 cm long of the anterior view of specimen B (ii) Give one function each of any three of the labeled parts.

14. Specimen C is a plant immersed in ink solution. Cut a thin cross section of the stem from at least 1 cm away from the ink mark upwards. Place the cut section in a Petri dish or transparent piece of glass or watch glass. Observe the cut section with a hand lens (a) Make a labeled drawing 8-10 cm in diameter of the cut surface to show with a distribution of tissues in the specimen (b), Shade all the stained tissues with horizontal strokes (c) Name two materials that are transported by the shaded tissues (d) Name three physical processes which help the transportation of materials from the soil to the leaf of the plant.

 

 

 

View Answer & Discuss WAEC 1995
4605

1. (a) Name the organism illustrated in the diagram above (b) Name the structure labelled A.

2.  List (a) two air pollutants (b) Three water pollutants. Study the diagram below and use it to answer question 3

3. (a) Name the structure  illustrated above (b) Name the parts labelled A- D (c) State the function of the part labelled C (d) in which group of animals is this structure found? 4. State the basic structure of a virus. Study the diagram below and use it to answer question 5 Study the diagram below and use it to answer question 5

 5. (a) Name the organism illustrated in the diagram above (b) Name the parts labelled A to D (c) What is the habitat of the organism? What are the functions of A and D? The diagram below represents an instrument used in an ecological study.

Use it to answer question 6

6. (a) VWhat is the name of the instrument? (b) What is the instrument used for? (c) What is the function of the part labelled A? (d) Name the parts labelled B and C.

7. A food substance was put in two test tubes labeilcd I and Il in test tube , Fehling's solutions A and B were added and the mixture warmed. A negative result was obtained. In test tube Il dilute hydrochloric acid was added and the mixture was boiled, after which few drops of sodium hyddroxide were added. Then Fehling's solutions A and B were added. A positive result was obtained in test tube H after warming (a) What colour should indicate a positive result in test tube lI? (b) What food substance must have given the positive result in test tube l1? (c) What role did dilute hydrochloric acid play in the test? (d) Why was sodium hydroxide added to test tube l1? (e) Why was a negative result obtained in test tube 1? (f) Suggest the food substance in the original samples tested

                                                                                                 SECTION B

Answer all the questions in this section

8. (a) ldentify specimens A and B without reason (b) State the agricultural classification of each of specimen A and B based on their uses. (c) Name one pest each that is likely to have put the specimens A and B in the condition they are (d) Name two ways of preventing the activity of the named pests during storage (e) Give one possible disadvantage of the named control measure of the pest during storage (f) Describe how you can test for the presence of protein in specimen A (g) Carry out a test to show the presence of starch in specimen B with the reagent provided. Record your procedure and result following the pattern given below

9.Examine specimen C carefully (a) Copy the table below in your answer book. Complete the table using your observations on specimen C

Test

Observation

Inference

     

 (b)

Name of floral parts

Number of floral parts

Colour of floral parts

Sepal

   

Petal

   

Filament

   

Stigma

   

b) Carefully detach the other petals except the special petal. Make a large labeled drawing (10-12 cm long) of the remaining floral parts. 0. The variation of length of leaves of a certain plant species was studied in order to illustrate the frequency distribution of the lengths. The leaves were sorted out into the following ranges of lengths:

(a) Using the data. draw a histogram to show the frequency of leaves of different lenghts. Place thee range of lengths on the horizontal axis and the number of leaves/frequency on the vertical axis (b) How many leaves were collected during the study? (c) if the leaves were collected from different plants,give two possible causes of the differences in length.

Range of length (in mm)

Number of leaves / frequency

21-24

3

24-27

30

27-30

66

30-33

40

33-36

10

36-39

20

39- 42

38

42-45

58

45-48

33

48-51

16

51-54

2

54-57

1

 

 

View Answer & Discuss WAEC 1996
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