NECTA CSEE Biology AI Practice 2026

Question 1

Which organelle is responsible for producing energy in the form of ATP in a eukaryotic cell?

Cell biologyCell structure and functioneasy

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Question 2

Which of the following best describes the role of enzymes in digestion?

Nutrition and transportDigestive enzymes and functionseasy

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Question 3

In which part of the plant cell does photosynthesis primarily take place?

Respiration and photosynthesisPhotosynthesiseasy

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Question 4

Which blood vessel carries oxygenated blood from the lungs to the heart?

Human physiologyCirculatory systemeasy

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Question 5

Which of the following is a characteristic of sexual reproduction?

ReproductionModes of reproductioneasy

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Question 6

What is the name of the process by which glucose is broken down in the presence of oxygen to release energy?

Respiration and photosynthesisCellular respirationmedium

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Question 7

Which blood component is primarily responsible for clotting?

Human physiologyBlood and its componentsmedium

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Question 8

Which of the following best explains why leaves are broad and thin?

Respiration and photosynthesisLeaf structure and functionmedium

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Question 9

Which structure in the human kidney is responsible for filtration of blood?

Human physiologyExcretory systemmedium

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Question 10

Which of the following genetic crosses represents a monohybrid cross?

GeneticsMendelian geneticsmedium

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Question 11

Which of the following best describes mutualism in ecology?

EcologyTypes of symbiotic relationshipseasy

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Question 12

During which phase of the cell cycle does DNA replication occur?

Cell biologyCell cycle and divisionmedium

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Question 13

Which of the following best explains why plants wilt when they lack water?

Nutrition and transportWater relations in plantsmedium

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Question 14

Which hormone regulates the menstrual cycle in human females?

Human physiologyReproductive hormonesmedium

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Question 15

Which of the following best describes the bottleneck effect in population genetics?

GeneticsPopulation geneticshard

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Question 16

Which process produces gametes with half the chromosome number of the parent cell?

ReproductionCell division and reproductionmedium

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Question 17

Which of the following best explains the function of the xylem in plants?

Nutrition and transportTransport in plantseasy

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Question 18

During aerobic respiration, which gas is taken in and which gas is released?

Respiration and photosynthesisGas exchange in respirationeasy

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Question 19

Which of the following is an example of a biotic factor in an ecosystem?

EcologyEcosystem componentseasy

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Question 20

Which of the following best describes the function of the liver in human digestion?

Nutrition and transportDigestive systemmedium

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Question 21

What is the primary function of mitochondria in a cell?

Cell biologyCell Structure and Functioneasy

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Question 22

Which nutrient is most important for building and repairing body tissues?

Nutrition and transportNutritioneasy

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Question 23

During photosynthesis, which gas is absorbed by plants?

Respiration and photosynthesisPhotosynthesiseasy

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Question 24

Which part of the human reproductive system produces sperm?

ReproductionHuman Reproductioneasy

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Question 25

What is the genotype of an individual with two identical alleles for a trait?

GeneticsMendelian Geneticseasy

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Question 26

Which of the following best describes a food chain?

EcologyEcosystemseasy

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Question 27

Which organ in the human body is primarily responsible for filtering blood?

Human physiologyExcretory Systemeasy

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Question 28

Which cell organelle is responsible for protein synthesis?

Cell biologyCell Structure and Functionmedium

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Question 29

In human digestion, where does most nutrient absorption occur?

Nutrition and transportDigestionmedium

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Question 30

What is the main gas released during aerobic respiration?

Respiration and photosynthesisCellular Respirationmedium

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Question 31

What term describes the physical expression of a gene?

GeneticsMendelian Geneticsmedium

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Question 32

Which of the following best shows the correct order of levels of ecological organization from simplest to most complex?

EcologyEcological Organizationmedium

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Question 33

What is the role of phloem in plants?

Nutrition and transportPlant Transportmedium

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Question 34

Which process results in the formation of gametes?

ReproductionCell Division and Reproductionmedium

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Question 35

Which of the following is NOT a product of photosynthesis?

Respiration and photosynthesisPhotosynthesismedium

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Question 36

Which blood vessel carries oxygenated blood away from the heart?

Human physiologyCirculatory Systemmedium

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Question 37

In genetics, what does a Punnett square predict?

GeneticsMendelian Geneticshard

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Question 38

Which of the following adaptations helps desert plants conserve water?

EcologyAdaptationshard

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Question 39

What is the function of the alveoli in the human respiratory system?

Human physiologyRespiratory Systemhard

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Question 40

Which organelle is primarily responsible for producing energy in the form of ATP in animal cells?

Cell biologyCell structure and functioneasy

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Question 41

Which of the following nutrients is primarily absorbed in the small intestine?

Nutrition and transportDigestive system and nutrient absorptioneasy

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Question 42

During photosynthesis, which gas is released as a by-product?

Respiration and photosynthesisPhotosynthesis processeasy

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Question 43

Which blood vessels carry blood away from the heart?

Human physiologyCirculatory systemeasy

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Question 44

Which process describes the formation of gametes in animals?

ReproductionReproductive biologymedium

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Question 45

In genetics, what does a heterozygous genotype mean?

GeneticsMendelian geneticsmedium

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Question 46

Which factor is biotic in an ecosystem?

EcologyEcosystems and environmenteasy

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Question 47

What is the primary function of hemoglobin in the blood?

Human physiologyBlood and circulationmedium

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Question 48

Which stage of cellular respiration produces the most ATP?

Respiration and photosynthesisCellular respirationhard

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Question 49

Which structure in plants prevents water loss?

Nutrition and transportPlant structure and transportmedium

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Question 50

Which hormone controls the release of eggs in the female reproductive system?

ReproductionHuman reproductive systemmedium

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Question 51

What is the main role of enzymes in biological reactions?

Cell biologyEnzymes and metabolismeasy

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Question 52

Which process explains the increase of carbon dioxide in the atmosphere due to human activities?

EcologyEnvironmental issuesmedium

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Question 53

Which blood type is considered the universal donor?

Human physiologyBlood groups and transfusionmedium

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Question 54

What is the genotype ratio of offspring from a monohybrid cross of two heterozygous individuals (Aa x Aa)?

GeneticsMendelian geneticsmedium

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Question 55

In an ecosystem, what term describes the feeding level of an organism?

EcologyEcosystemseasy

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Question 56

Which of the following is NOT a function of the human liver?

Human physiologyDigestive systemmedium

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Question 57

Which cellular structure is responsible for protein synthesis?

Cell biologyCell organelleseasy

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Question 58

Which gas is essential for aerobic respiration?

Respiration and photosynthesisCellular respirationeasy

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Question 59

Which part of the plant transports sugars produced during photosynthesis?

Nutrition and transportPlant transport systemseasy

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Question 60

What is the primary function of the mitochondria in a eukaryotic cell?

Cell biologyCell structure and functioneasy

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Question 61

Which type of nutrition do green plants use to make their own food?

Nutrition and transportTypes of nutritioneasy

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Question 62

During photosynthesis, which gas is taken in and which is released?

Respiration and photosynthesisPhotosynthesis processeasy

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Question 63

What is the main role of phloem in plants?

Nutrition and transportTransport in plantsmedium

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Question 64

Which process breaks down glucose to release energy in cells?

Respiration and photosynthesisCellular respirationmedium

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Question 65

In human reproduction, where does fertilization normally occur?

ReproductionHuman reproductive systemmedium

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Question 66

What is the genotype of an individual who is heterozygous for a trait?

GeneticsGenotypes and alleleseasy

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Question 67

Which of the following best describes an ecosystem?

EcologyEcosystem conceptseasy

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Question 68

What is the main function of the large intestine in humans?

Human physiologyDigestive systemmedium

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Question 69

Which of the following best explains why leaves are thin and flat?

Nutrition and transportAdaptations for photosynthesismedium

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Question 70

What role do enzymes play in biological systems?

Cell biologyEnzyme functionmedium

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Question 71

Which of the following is a correct sequence for the flow of blood through the heart?

Human physiologyCirculatory systemhard

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Question 72

In genetics, what does the term 'phenotype' refer to?

GeneticsPhenotype and genotypemedium

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Question 73

What is the function of the alveoli in the human lungs?

Human physiologyRespiratory systemmedium

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Question 74

Which of the following is true about sexual reproduction in flowering plants?

ReproductionFlowering plant reproductionmedium

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Question 75

Which of these best explains why desert plants often have thick waxy cuticles?

EcologyPlant adaptationshard

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Question 76

Which blood component is responsible for blood clotting?

Human physiologyBlood and circulationmedium

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Question 77

Which organelle is responsible for producing energy in the form of ATP in a cell?

Cell biologyCell Structure and Functioneasy

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Question 78

What is the primary function of xylem vessels in plants?

Nutrition and transportTransport in Plantsmedium

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Question 79

During photosynthesis, which gas is taken in by the plant leaves?

Respiration and photosynthesisPhotosynthesiseasy

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Question 80

Which type of reproduction involves fusion of male and female gametes?

ReproductionModes of reproductionmedium

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Question 81

In genetics, what does the term 'heterozygous' refer to?

GeneticsMendelian Geneticsmedium

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Question 82

Which of the following best explains the greenhouse effect?

EcologyEnvironmental Issueshard

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Question 83

Which hormone regulates the water balance in human kidneys?

Human physiologyEndocrine Systemmedium

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Question 84

What is the role of ribosomes in a cell?

Cell biologyCell Structure and Functioneasy

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Question 85

Which of the following best describes the role of mitochondria in a cell?

Cell biologyCell structure and functioneasy

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NECTA Biology AI Practice