2024 BECE SCIENCE MARKING SCHEME

 2024 BECE SCIENCE MARKING SCHEME

The lines below will take us through suggested answers for the 2024 Science BECE past questions. Note that, diagrams included in the actual paper are not included here, but you can access them by downloading the full questions which can be found in this link. Download full Questions here before moving to the answers.

 

After downloading, you then come back to get the answers.

SUGGESTED ANSWERS TO 2024 BECE QUESTIONS SCIENCE

Question 1

(a) Fig. 1(a) is an illustration of the longitudinal section of the mammalian heart. Study it carefully and answer the questions that follow.

(i) State one function for each of the parts labelled I, II, IX, and X.

I (Right Atrium): Receives deoxygenated blood from the body via the vena cava and pumps it into the right ventricle.

II (Right Ventricle): Pumps deoxygenated blood to the lungs via the pulmonary artery for oxygenation.

IX (Left Atrium): Receives oxygenated blood from the lungs via the pulmonary veins and pumps it into the left ventricle.

X (Left Ventricle): Pumps oxygenated blood to the rest of the body via the aorta.

 

 (ii) Explain briefly why the left lower part of the heart has a thicker muscle.

The left lower part of the heart, the left ventricle, has a thicker muscle because it needs to pump oxygenated blood at high pressure throughout the entire body, which requires more force compared to the right ventricle that only pumps blood to the lungs.

(iii) State two ways by which the flow of blood to and from the mammalian heart as shown in Fig. 1(a) can be kept at acceptable levels.

1. Valves: Prevent the backflow of blood and ensure unidirectional flow through the heart.
2. Cardiac Conduction System: Coordinates the heartbeat, ensuring the heart muscles contract in a synchronized manner.

 

 (iv) Name two parts of the heart where oxygenated blood can be found.

1. Left Atrium
2. Left Ventricle

 

(b) Fig. 1(b) is an illustration of three sets of plant parts labelled P (maize grains), Q (tomato seedlings), and R (cassava cutting). Study it carefully and answer the questions that follow.

 

 (i) Describe briefly how each of the parts labelled P, Q, and R are planted on a seedbed.

P (Maize grains): Maize grains are planted by creating small holes or furrows in the soil, placing the grains in them, and then covering them with soil.

Q (Tomato seedlings): Tomato seedlings are transplanted into the seedbed by digging small holes, placing the seedlings in the holes, and gently pressing the soil around them.

R (Cassava cutting): Cassava cuttings are planted by placing the cuttings horizontally or at an angle in the soil, covering them partly with soil.

2024 BECE SCIENCE MARKING SCHEME – LEARNRITEHERE.COM

 

 (ii) State four conditions under which R can be cultivated to produce high yield.

1. Adequate sunlight: Cassava requires full sun exposure for optimal growth.
2. Well-drained soil: Cassava prefers loamy or sandy soil that drains well to prevent root rot.
3. Regular watering: Consistent moisture is needed, especially during the early stages of growth.
4. Proper spacing: Ensures each plant has enough room to grow and access nutrients and sunlight.

 

 Question 1 (c)

 (i) State one function for each of the parts labelled I, II, III, and IV.

I (Battery): Provides the electrical energy required to drive the current through the circuit.

II (Resistor): Limits the amount of current flowing through the circuit.

III (Switch): Opens or closes the circuit, controlling the flow of current.

IV (Resistor): Same as part II, limits the current flow through the circuit.

 

 (ii) If the voltmeter reads 2.4 V and the ammeter reads 0.8 A when the circuit is closed, calculate the value of the part labelled IV.

Using Ohm’s law,

V = IR

R = V/I

=2.4/0.8

= 3ohms.

 

 (iii) State one way of conserving the value of the part labelled I in the circuit.

Turn off the switch when the circuit is not in use to prevent the battery from discharging.

 

 (iv) State two observations that can be made when the circuit is closed.

The ammeter needle deflects, indicating current flow.

The components may produce heat due to the current flow.

 

 Question 1 (d)

 (i) Describe briefly the process of this experiment.

The setup is for a separating funnel. It is used to separate immiscible liquids (liquids that do not mix). The mixture is poured into the funnel and allowed to settle into two layers. The denser liquid is drained out first by opening the stopcock, followed by the less dense liquid.

 

 (ii) State one function for each of the parts labelled II and IV.

II (Stopcock): Controls the release of the liquids from the funnel.

IV (Stand): Supports the separating funnel during the separation process.

 

 (iii) State two precautions that should be taken to obtain reliable results when performing this experiment.

Ensure the stopcock is tightly closed before adding the mixture to the funnel.

Allow sufficient time for the liquids to separate into distinct layers before draining.

 

 Question 2

 (a) (i) Given a flashlight, a tennis ball, and a screen; draw a diagram to show how a shadow can be formed.

Place the flashlight behind the tennis ball, with the tennis ball between the flashlight and the screen. The flashlight should shine directly at the ball, casting a shadow on the screen.

 

 (ii) Determine the density of the irregular body.

Using the data from Fig. 2:

Initial volume of water = 50 cm³

Final volume with the irregular body = 75 cm³

Volume of the irregular body = 75 cm³ – 50 cm³ = 25 cm³

Density} = Mass/Volume

= 4 kg/25cm³

= 400g/25cm³

= 160g/cm3

 

 (iii) State two precautions that must be taken to obtain reliable results.

Ensure the measuring cylinder is placed on a flat, stable surface.

Read the water level at eye level to avoid parallax error.

2024 BECE SCIENCE MARKING SCHEME

 

 Question 3

(a) Design a 4year rotational program using the given crops.

             PLT 1          PLT2        PLT3

Year 1: Maize     Cowpea    cassava

Year 2: Cowpea  Cassava    cabbage

Year 3: Cassava   cabbage   maize

Year 4: Cabbage   maize     cowpea

 

(i) Give two reasons for the sequence given in 3(a)(i).

Rotating crops helps prevent the depletion of specific nutrients in the soil.

It reduces the build-up of pests and diseases associated with a single crop.

 

 (b) Give three symptoms that the student may exhibit to confirm this suspicion.

1. Fever
2. Cough
3. Shortness of breath

 

 (c) Calculate the acceleration, force, and final momentum.

 Acceleration:

a = u – v/t

a= 150 – 100/10

a = 5m/s²

 Force:

F = ma

= 1000kg x 5

F = 5000N

 Final Momentum:

P = MV

P = 1000kg X 150m/s

P = 150,000kgm/s

 

 Question 4

 (a) A balanced chemical equation for the reaction.

NaHCO₃ + HCl ==> NaCl + H₂O + CO₂

 

 (b) Calculate the energy of the body.

Potential Energy:

PE = mgh

= 20 kg x 9.8ms² x 10m

= 1960J

 

 (c) (i) Define the term Light Emitting Diode (LED).

A light emitting diode (LED) is a semiconductor device that emits light when an electric current passes through it.

 

 (ii) Mention two devices that use LEDs in their operation.

1. Television screens
2. Traffic lights

 

 (d) (i) Suggest two simple tools that could be used in the nursery bed preparation.

1. Hand trowel
2. Garden fork

 

 (ii) State one function of each of the tools listed in (d)(i).

Hand trowel: Used for digging small holes and transplanting seedlings.

Garden fork:  Used for loosening and aerating the soil.

 

 (e) (i) State three observable features of an animal cell.

1. Nucleus
2. Cytoplasm
3. Cell membrane

 

 (ii) State two functions of a nerve cell.

1. Transmitting electrical signals throughout the body
2. Processing and interpreting sensory information

 

 Question 5: 2024 BECE SCIENCE MARKING SCHEME

 

 (a) (i) Calculate the effective resistance in the circuit when it is closed.

The resistors are in series, so

R = 4 Ω + 5 Ω = 9 Ω

 

 (ii) Calculate the current that will flow through the circuit when it is closed.

Using Ohm’s law:

I = V/R

= 6V/9 Ω = 0.67A

 

 (b) (i) Differentiate between an organic fertilizer and an inorganic fertilizer.

Organic fertilizer: Derived from plant or animal matter, such as compost or manure.

Inorganic fertilizer: Manufactured from chemical compounds, such as ammonium nitrate or potassium sulfate.

 

 (ii) Outline briefly the steps involved in preparing raised beds.

1. Select and clear the area.
2. Mark the bed dimensions.
3. Loosen the soil with a garden fork.
4. Add compost or organic matter.
5. Shape the soil into raised beds.

 

 (c) (i) State one function of each of the following components of blood:

Red blood cells: Transport oxygen from the lungs to the body tissues.

White blood cells: Fight infection and provide immunity.

Blood plasma: Carries nutrients, hormones, and waste products.

 

 (ii) Explain briefly the impact of each of the following organisms on humans:

Housefly: Can spread diseases by contaminating food and surfaces.

Grasshopper: Can damage crops, leading to reduced agricultural yields.

 

 (d) Describe briefly the formation of an ammonia molecule after an interaction between H and N atoms.

An ammonia molecule (NH₃) forms when one nitrogen atom (N) covalently bonds with three hydrogen atoms (H). The nitrogen atom has five valence electrons and needs three more electrons to complete its octet. Each hydrogen atom has one valence electron and needs one more electron to complete its duet. In the NH₃ molecule, nitrogen shares one of its electrons with each hydrogen atom, and each hydrogen atom shares one electron with nitrogen, forming three NH covalent bonds.

OBJECTIVE TEST OPTIONS

1. C 2. A 3. B   4. C   5. C  6. A  7. D  8. B  9. B 10. C  11. A  12. D  13. B  14. B  15. D  16. D  17. A  18. A  19. C  20. B  21. C  22. B  23. B  24. B  25. B  26. C  27. C  28. C  29. A  30. D  31. C
2. D 33. D 34. A  35. B  36. A  37. A  38. D  39. C  40. B

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