See Answers: 2024 BECE Science Questions on the Specified Topics

See Answers: 2024 BECE Science Questions on the Specified Topics

Are you sitting for the upcoming BECE? Then these questions are for you. They have been carefully prepared on selected topics from the new NaCCA science books used by schools across the country.

These BECE science questions consist of 10 different questions with sub questions, answers have been supplied but we entreat you to solve these questions before jumping to the answers.

In order for you to have access to the questions, as a serious student it will be good if you have your pen and a paper and have all questions written. Lay your hands on them, those you are not able to tackle do well to consult your teachers or better still, refer to our suggested answers.

2024 BECE SCIENCE QUESTIONS WITH ANSWERS

(a) Define what a specialized cell is and provide three examples.

(b) Mention any four specialised cells in animals

(a) State the components of an ecosystem

(b What is ecosystem

(a) Define what a compound is

(b) Give three examples commonly found in household items.

(a) Describe the formation of ions

(b) List three examples each of positively and negatively charged ions.

(a) Differentiate between a homogeneous and a heterogeneous mixture. Provide two examples of each.
(a) Explain the process of separating a mixture of sand and salt.

(b) Outline the steps involved and the apparatus needed for this separation.

(a) Briefly explain, crop rotation and state three advantages

(b) Give any two importance of fertilizers in crop production

Describe briefly the following stage of hydrological cycle

i. Evaporation ii. Precipitation iii. Condensation

(b) State any three advantages of the water cycle to humans

(a) Outline the life cycle of a mosquito, including the four stages.

(b) Mention any two environmental conditions necessary for the mosquito to complete its life cycle.

(a) Identify any three diseases transmitted by mosquitoes.

(b) What three environmental measures that can be adopted to prevent the spread of mosquitoes.

Find below the answers to the 2024 BECE Trial Questions

(a) A specialized cell is a cell that has a specific structure and function adapted to perform particular tasks in an organism’s body.

(b) i. Sperm cells (spermatozoa)

ii. Skin cells (keratinocytes)

iii. White blood cells (leukocytes)

iv. Egg cells (ova)

ii. Guard cells

iii. Xylem cells

2. (a) The components of an ecosystem are:

i. Abiotic factors (non-living components like soil, water, air)

ii. Biotic factors (living organisms like plants, animals, microbes)

(b) An ecosystem is a biological community of interacting organisms and their physical environment.

(a) A compound is a substance composed of two or more different elements chemically bonded together in a fixed ratio.

(b) i. Sodium chloride (table salt)

ii. Water (H₂O)

iii. Carbon dioxide (CO₂)

(c) Compounds are chemically bonded substances with fixed compositions, while mixtures are physically combined substances with variable compositions.

(a) Ions are formed when atoms gain or lose electrons. Atoms become positively charged ions (cations) by losing electrons and negatively charged ions (anions) by gaining electrons.

(b) Positively charged ions (cations):

i. Sodium ion (Na⁺)

ii. Calcium ion (Ca₂⁺)

iii. Hydrogen ion (H⁺)

Negatively charged ions (anions):

i. Chloride ion (Cl^–)

ii. Sulphate ion (SO₄^2-)

iii. Nitrate ion (NO₃^–)

(a) Homogeneous mixtures have uniform composition and appearance throughout, whereas heterogeneous mixtures have non-uniform composition and appearance. Examples:

Homogeneous: Saltwater, air

Heterogeneous: Salad, soil

(a) The process of separating sand and salt involves dissolving the salt in water, leaving behind the insoluble sand. The steps involved include:

i. Place the sand and salt mixture in a container.

ii. Add water to the mixture and stir to dissolve the salt.

iii. Filter the mixture to separate the sand particles from the saltwater solution.

iv. Evaporate the water from the saltwater solution, leaving behind the salt.

7. (a) Crop rotation involves planting different crops in a specific order over successive seasons to maintain soil fertility, prevent pest buildup, and reduce soil erosion.

Advantages:

i. Helps in controlling pests and diseases.

ii. Improves soil fertility and structure.

iii. Reduces the depletion of specific nutrients in the soil.

(b) i. Fertilizers supply essential nutrients to plants for healthy growth.

ii. They enhance crop yield and quality.

Compound/mixed fertilizer

8. i. Evaporation: The process by which water changes from liquid to vapour due to heat energy from the sun.

ii. Precipitation: The release of condensed water vapour in the atmosphere in the form of rain, snow, sleet, or hail.

iii. Condensation: The process where water vapour in the air cools and changes back into liquid water.

(b) i. Provides freshwater for drinking and agriculture.

ii. Helps in maintaining balanced temperatures on Earth.

iii. Supports natural habitats and ecosystems.

9. (a) i. Egg

ii. Larva

iii. Pupa

iv. Adult

(b) i. Standing water for egg laying and larval development.

ii. Warm temperature for faster growth and development.

10. (a) i. Malaria

ii. Dengue fever

iii. Zika virus

(b) i. Eliminating stagnant water sources to prevent breeding.

ii. Using mosquito nets and repellents.

iii. Implementing proper waste management to reduce breeding sites.

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