300+ Top GCSE Biology Quiz Questions and Answers MCQs

GCSE Biology Quiz Multiple Choice Questions| Practice Exam

1. Which of the following is responsible for the digestion of proteins in the human body?

A. Stomach

B. Liver

C. Small intestine

D. Pancreas

Answer: A. Stomach

2. What is the role of the mitochondria in a cell?

A. Storage of water

B. Production of energy

C. Transport of nutrients

D. Detoxification of harmful substances

Answer: B. Production of energy

3. Which of the following is a function of the ribosomes in a cell?

A. Protection of the cell

B. Control of cell division

C. Synthesis of proteins

D. Storage of genetic information

Answer: C. Synthesis of proteins

4. Which of the following is the site of photosynthesis in plant cells?

A. Mitochondria

B. Chloroplasts

C. Nucleus

D. Golgi apparatus

Answer: B. Chloroplasts

5. Which of the following is responsible for carrying oxygen in the bloodstream?

A. Red blood cells

B. White blood cells

C. Platelets

D. Plasma

Answer: A. Red blood cells

6. Which of the following is an example of an organ in the human body?

A. Nucleus

B. Ribosome

C. Lungs

D. Enzyme

Answer: C. Lungs

7. Which of the following is a function of the nucleus in a cell?

A. Production of energy

B. Storage of genetic information

C. Synthesis of proteins

D. Breakdown of waste materials

Answer: B. Storage of genetic information

8. What is the main function of the circulatory system in the human body?

A. Exchange of gases

B. Removal of waste products

C. Regulation of body temperature

D. Transportation of nutrients and hormones

Answer: D. Transportation of nutrients and hormones

9. Which of the following is responsible for the production of antibodies in the human body?

A. Red blood cells

B. White blood cells

C. Platelets

D. Plasma

Answer: B. White blood cells

10. Which of the following is an example of an infectious disease?

A. Diabetes

B. Cancer

C. Influenza

D. Asthma

Answer: C. Influenza

GCSE Biology Exam Questions and Answers pdf

11. Which of the following is the primary function of the respiratory system?

A. Production of hormones

B. Regulation of body temperature

C. Exchange of gases

D. Digestion of food

Answer: C. Exchange of gases

12. Which of the following is responsible for carrying out photosynthesis in plant cells?

A. Chlorophyll

B. Mitochondria

C. Vacuole

D. Golgi apparatus

Answer: A. Chlorophyll

13. Which of the following is a greenhouse gas that contributes to global warming?

A. Oxygen

B. Nitrogen

C. Carbon dioxide

D. Hydrogen

Answer: C. Carbon dioxide

14. Which of the following is responsible for transmitting electrical signals in the nervous system?

A. Neurons

B. Red blood cells

C. Muscle cells

D. Epithelial cells

Answer: A. Neurons

15. Which of the following is the correct sequence of stages in the cell cycle?

A. G1, S, G2, M

B. G2, M, G1, S

C. S, G2, G1, M

D. M, G1, S, G2

Answer: A. G1, S, G2, M

16. Which of the following is the function of the enzyme amylase?

A. Breakdown of lipids

B. Breakdown of carbohydrates

C. Breakdown of proteins

D. Synthesis of DNA

Answer: B. Breakdown of carbohydrates

17. Which of the following is responsible for the production of sperm in males?

A. Ovaries

B. Uterus

C. Testes

D. Fallopian tubes

Answer: C. Testes

18. Which of the following is an example of an involuntary muscle?

A. Biceps muscle

B. Quadriceps muscle

C. Cardiac muscle

D. Hamstring muscle

Answer: C. Cardiac muscle

19. Which of the following is the function of the hormone insulin in the human body?

A. Regulation of blood sugar levels

B. Regulation of body temperature

C. Production of red blood cells

D. Digestion of fats

Answer: A. Regulation of blood sugar levels

20. Which of the following is responsible for the production of eggs in females?

A. Ovaries

B. Uterus

C. Testes

D. Fallopian tubes

Answer: A. Ovaries

21. Which of the following is the basic structural unit of all living organisms?

A. Cell

B. Tissue

C. Organ

D. Organism

Answer: A. Cell

22. Which of the following is the function of the hormone adrenaline in the human body?

A. Regulation of blood sugar levels

B. Fight-or-flight response

C. Maintenance of water balance

D. Control of body temperature

Answer: B. Fight-or-flight response

23. Which of the following is the primary function of the excretory system?

A. Exchange of gases

B. Transportation of nutrients

C. Removal of waste products

D. Regulation of body temperature

Answer: C. Removal of waste products

24. Which of the following is responsible for the production of the female sex hormone estrogen?

A. Ovaries

B. Uterus

C. Testes

D. Fallopian tubes

Answer: A. Ovaries

25. Which of the following is the correct order of the levels of organization in the human body from simplest to most complex?

A. Organism, organ system, organ, tissue, cell

B. Cell, tissue, organ, organ system, organism

C. Organ, organism, tissue, cell, organ system

D. Tissue, cell, organ system, organ, organism

Answer: B. Cell, tissue, organ, organ system, organism

26. Which of the following is responsible for the production of the hormone testosterone in males?

A. Ovaries

B. Uterus

C. Testes

D. Fallopian tubes

Answer: C. Testes

27. Which of the following is the function of the enzyme pepsin?

A. Breakdown of carbohydrates

B. Breakdown of lipids

C. Breakdown of proteins

D. Synthesis of DNA

Answer: C. Breakdown of proteins

28. Which of the following is the process by which plants convert light energy into chemical energy?

A. Respiration

B. Photosynthesis

C. Transpiration

D. Fermentation

Answer: B. Photosynthesis

29. Which of the following is responsible for the production of the hormone melatonin?

A. Pineal gland

B. Pituitary gland

C. Thyroid gland

D. Adrenal gland

Answer: A. Pineal gland

30. Which of the following is the function of the enzyme lipase?

A. Breakdown of carbohydrates

B. Breakdown of lipids

C. Breakdown of proteins

D. Synthesis of DNA

Answer: B. Breakdown of lipids

31. Which of the following is the process by which water is lost from the leaves of plants?

A. Transpiration

B. Respiration

C. Photosynthesis

D. Osmosis

Answer: A. Transpiration

32. Which of the following is responsible for the production of antibodies?

A. Red blood cells

B. White blood cells

C. Platelets

D. Plasma

Answer: B. White blood cells

33. Which of the following is the function of the enzyme trypsin?

A. Breakdown of carbohydrates

B. Breakdown of lipids

C. Breakdown of proteins

D. Synthesis of DNA

Answer: C. Breakdown of proteins

34. Which of the following is the process by which plants and animals release energy from food?

A. Respiration

B. Photosynthesis

C. Digestion

D. Excretion

Answer: A. Respiration

35. Which of the following is the largest organ in the human body?

A. Heart

B. Brain

C. Skin

D. Liver

Answer: C. Skin

36. Which of the following is the process by which plants and some bacteria convert nitrogen gas into a usable form for living organisms?

A. Nitrogen fixation

B. Photosynthesis

C. Respiration

D. Transpiration

Answer: A. Nitrogen fixation

37. Which of the following is responsible for the storage of genetic information in a cell?

A. Mitochondria

B. Nucleus

C. Chloroplasts

D. Endoplasmic reticulum

Answer: B. Nucleus

38. Which of the following is the function of the enzyme amylase in the digestive system?

A. Breakdown of carbohydrates

B. Breakdown of proteins

C. Breakdown of lipids

D. Synthesis of DNA

Answer: A. Breakdown of carbohydrates

39. Which of the following is responsible for the transport of water and nutrients in a plant?

A. Xylem

B. Phloem

C. Epidermis

D. Stomata

Answer: A. Xylem

40. Which of the following is the correct sequence of levels of classification in the biological hierarchy, from broadest to most specific?

A. Kingdom, phylum, class, order, family, genus, species

B. Phylum, kingdom, class, order, family, genus, species

C. Kingdom, phylum, order, class, family, genus, species

D. Phylum, kingdom, order, class, family, genus, species

Answer: A. Kingdom, phylum, class, order, family, genus, species

41. Which of the following is the primary function of the red blood cells?

A. Transporting oxygen

B. Fighting infections

C. Forming blood clots

D. Filtering waste products

Answer: A. Transporting oxygen

42. Which of the following is responsible for the regulation of water balance in the body?

A. Kidneys

B. Liver

C. Stomach

D. Lungs

Answer: A. Kidneys

43. Which of the following is the process by which plants make their own food?

A. Respiration

B. Digestion

C. Excretion

D. Photosynthesis

Answer: D. Photosynthesis

44. Which of the following is the function of the enzyme DNA polymerase?

A. Breaking down DNA molecules

B. Synthesizing new DNA strands

C. Breaking down RNA molecules

D. Synthesizing new RNA strands

Answer: B. Synthesizing new DNA strands

45. Which of the following is responsible for the regulation of blood glucose levels?

A. Insulin

B. Glucagon

C. Melatonin

D. Estrogen

Answer: A. Insulin

46. Which of the following is responsible for the transmission of electrical signals between neurons?

A. Synapse

B. Hormone

C. Red blood cell

D. Enzyme

Answer: A. Synapse

47. Which of the following is the primary function of the large intestine?

A. Absorption of nutrients

B. Production of bile

C. Storage and elimination of waste

D. Filtration of blood

Answer: C. Storage and elimination of waste

48. Which of the following is responsible for the production of the hormone progesterone in females?

A. Ovaries

B. Uterus

C. Testes

D. Fallopian tubes

Answer: A. Ovaries

49. Which of the following is the process by which a cell divides into two identical daughter cells?

A. Meiosis

B. Mitosis

C. Fertilization

D. Replication

Answer: B. Mitosis

50. Which of the following is responsible for the transmission of genetic information from parents to offspring?

A. RNA

B. DNA

C. Protein

D. Lipid

Answer: B. DNA

GCSE Biology Exam Questions Quiz

1. Which of the following is the site of gas exchange in the human respiratory system?

A. Bronchi

B. Alveoli

C. Trachea

D. Diaphragm

Answer: B. Alveoli

2. What is the function of the hormone insulin in the human body?

A. Regulating blood sugar levels

B. Controlling body temperature

C. Promoting growth and development

D. Regulating sleep patterns

Answer: A. Regulating blood sugar levels

3. Which of the following is the correct order of biological organization, from simplest to most complex?

A. Cell, tissue, organ, organ system, organism

B. Organism, organ system, organ, tissue, cell

C. Organ, tissue, cell, organ system, organism

D. Cell, organ system, organ, tissue, organism

Answer: A. Cell, tissue, organ, organ system, organism

4. What is the function of the enzyme amylase in the digestive system?

A. Breaking down proteins

B. Breaking down carbohydrates

C. Breaking down lipids

D. Breaking down nucleic acids

Answer: B. Breaking down carbohydrates

5. Which of the following is responsible for carrying oxygen in the bloodstream?

A. Red blood cells

B. White blood cells

C. Platelets

D. Plasma

Answer: A. Red blood cells

6. Which of the following is the process by which plants convert light energy into chemical energy?

A. Respiration

B. Photosynthesis

C. Transpiration

D. Fermentation

Answer: B. Photosynthesis

7. Which of the following is responsible for the production of the hormone adrenaline?

A. Pancreas

B. Thyroid gland

C. Adrenal glands

D. Pituitary gland

Answer: C. Adrenal glands

8. Which of the following is the function of the enzyme protease in the digestive system?

A. Breakdown of carbohydrates

B. Breakdown of lipids

C. Breakdown of proteins

D. Synthesis of DNA

Answer: C. Breakdown of proteins

9. Which of the following is the primary function of the circulatory system?

A. Exchange of gases

B. Regulation of body temperature

C. Absorption of nutrients

D. Production of hormones

Answer: A. Exchange of gases

10. Which of the following is responsible for the transport of oxygen in the bloodstream?

A. White blood cells

B. Platelets

C. Red blood cells

D. Plasma

Answer: C. Red blood cells

bbc bitesize biology gcse aqa | biology past paper aqa
11. Which of the following is the function of the enzyme lipase in the digestive system?

A. Breakdown of carbohydrates

B. Breakdown of lipids

C. Breakdown of proteins

D. Synthesis of DNA

Answer: B. Breakdown of lipids

12. Which of the following is responsible for the production of the hormone oxytocin?

A. Thyroid gland

B. Pancreas

C. Pituitary gland

D. Adrenal glands

Answer: C. Pituitary gland

13. Which of the following is the process by which cells produce new individuals of the same species?

A. Fertilization

B. Mitosis

C. Meiosis

D. Replication

Answer: B. Mitosis

14. Which of the following is the primary function of the urinary system?

A. Digestion of food

B. Production of hormones

C. Removal of waste products

D. Exchange of gases

Answer: C. Removal of waste products

15. Which of the following is responsible for the transmission of genetic information from parents to offspring?

A. RNA

B. DNA

C. Protein

D. Lipid

Answer: B. DNA

16. Which of the following is responsible for the transmission of nerve impulses in the human body?

A. Neurons

B. Hormones

C. Red blood cells

D. Platelets

Answer: A. Neurons

17. Which of the following is the function of the enzyme carbohydrase in the digestive system?

A. Breakdown of carbohydrates

B. Breakdown of lipids

C. Breakdown of proteins

D. Synthesis of DNA

Answer: A. Breakdown of carbohydrates

18. Which of the following is the process by which an organism releases metabolic waste products?

A. Respiration

B. Photosynthesis

C. Excretion

D. Digestion

Answer: C. Excretion

19. Which of the following is responsible for the production of the hormone insulin?

A. Pancreas

B. Thyroid gland

C. Adrenal glands

D. Pituitary gland

Answer: A. Pancreas

20. Which of the following is the primary function of the skeletal system?

A. Protection of internal organs

B. Regulation of body temperature

C. Production of red blood cells

D. Exchange of gases

Answer: A. Protection of internal organs

21. Which of the following is responsible for the breakdown of worn-out organelles and cell debris in a cell?

A. Lysosomes

B. Mitochondria

C. Golgi apparatus

D. Endoplasmic reticulum

Answer: A. Lysosomes

22. Which of the following is the process by which cells obtain energy from glucose in the absence of oxygen?

A. Respiration

B. Photosynthesis

C. Fermentation

D. Transpiration

Answer: C. Fermentation

23. Which of the following is responsible for the production of the female sex hormone estrogen?

A. Ovaries

B. Uterus

C. Testes

D. Fallopian tubes

Answer: A. Ovaries

24. Which of the following is the primary function of the endocrine system?

A. Regulation of body temperature

B. Coordination of body movements

C. Production of hormones

D. Exchange of gases

Answer: C. Production of hormones

25. Which of the following is responsible for the transport of water and minerals from the roots to the leaves in a plant?

A. Xylem

B. Phloem

C. Epidermis

D. Stomata

Answer: A. Xylem

26. Which of the following is the function of the enzyme pepsin in the digestive system?

A. Breakdown of carbohydrates

B. Breakdown of lipids

C. Breakdown of proteins

D. Synthesis of DNA

Answer: C. Breakdown of proteins

27. Which of the following is the process by which water moves across a semi-permeable membrane from an area of higher concentration to an area of lower concentration?

A. Osmosis

B. Diffusion

C. Active transport

D. Facilitated diffusion

Answer: A. Osmosis

28. Which of the following is responsible for the control and coordination of body activities in humans?

A. Nervous system

B. Endocrine system

C. Respiratory system

D. Circulatory system

Answer: A. Nervous system

29. Which of the following is the primary function of the reproductive system?

A. Regulation of body temperature

B. Production of hormones

C. Exchange of gases

D. Reproduction

Answer: D. Reproduction

30. Which of the following is responsible for the transport of sugars and other organic nutrients in a plant?

A. Xylem

B. Phloem

C. Epidermis

D. Stomata

Answer: B. Phloem

31. Which of the following is the process by which energy is released from glucose in the presence of oxygen?

A. Respiration

B. Photosynthesis

C. Fermentation

D. Transpiration

Answer: A. Respiration

32. Which of the following is responsible for the production of the male sex hormone testosterone?

A. Ovaries

B. Uterus

C. Testes

D. Fallopian tubes

Answer: C. Testes

33. Which of the following is the process by which undigested food material is removed from the body?

A. Absorption

B. Assimilation

C. Egestion

D. Secretion

Answer: C. Egestion

34. Which of the following is responsible for the production of antibodies in response to foreign substances in the body?

A. Red blood cells

B. White blood cells

C. Platelets

D. Plasma

Answer: B. White blood cells

35. Which of the following is the correct order of the stages of mitosis?

A. Prophase, metaphase, anaphase, telophase

B. Metaphase, prophase, anaphase, telophase

C. Anaphase, prophase, metaphase, telophase

D. Telophase, anaphase, prophase, metaphase

Answer: A. Prophase, metaphase, anaphase, telophase

36. Which of the following is responsible for the release of eggs from the ovaries in females?

A. Uterus

B. Fallopian tubes

C. Cervix

D. Vagina

Answer: B. Fallopian tubes

37. Which of the following is the process by which plants lose water vapor through small openings on their leaves?

A. Osmosis

B. Transpiration

C. Diffusion

D. Active transport

Answer: B. Transpiration

38. Which of the following is the function of the enzyme DNA helicase during DNA replication?

A. Breaking down DNA molecules

B. Synthesizing new DNA strands

C. Breaking down RNA molecules

D. Unwinding the DNA double helix

Answer: D. Unwinding the DNA double helix

39. Which of the following is responsible for the regulation of blood pressure in the human body?

A. Adrenal glands

B. Thyroid gland

C. Pituitary gland

D. Kidneys

Answer: D. Kidneys

40. Which of the following is the process by which plants respond to light by growing towards it?

A. Phototropism

B. Gravitropism

C. Hydrotropism

D. Thigmotropism

Answer: A. Phototropism

41. Which of the following is responsible for the breakdown of toxins and drugs in the liver?

A. Pancreas

B. Gallbladder

C. Kidneys

D. Enzymes

Answer: D. Enzymes

42. Which of the following is the process by which water molecules move across a cell membrane from an area of lower solute concentration to an area of higher solute concentration?

A. Osmosis

B. Diffusion

C. Active transport

D. Facilitated diffusion

Answer: C. Active transport

43. Which of the following is responsible for the regulation of body temperature in humans?

A. Nervous system

B. Endocrine system

C. Respiratory system

D. Circulatory system

Answer: D. Circulatory system

44. Which of the following is the primary function of the ribosomes in a cell?

A. Production of energy

B. Synthesis of proteins

C. Storage of genetic information

D. Control of cell division

Answer: B. Synthesis of proteins

45. Which of the following is responsible for the transmission of genetic traits from parents to offspring?

A. Nucleus

B. Cytoplasm

C. Mitochondria

D. Genes

Answer: D. Genes

46. Which of the following is responsible for the production of the hormone melatonin?

A. Pituitary gland

B. Thyroid gland

C. Adrenal glands

D. Pineal gland

Answer: D. Pineal gland

47. Which of the following is the process by which plants convert nitrates in the soil into proteins?

A. Photosynthesis

B. Transpiration

C. Respiration

D. Nitrogen fixation

Answer: D. Nitrogen fixation

48. Which of the following is the function of the enzyme amylase in the mouth during digestion?

A. Breakdown of proteins

B. Breakdown of carbohydrates

C. Breakdown of lipids

D. Breakdown of nucleic acids

Answer: B. Breakdown of carbohydrates

49. Which of the following is responsible for the production of the hormone progesterone?

A. Ovaries

B. Uterus

C. Testes

D. Fallopian tubes

Answer: A. Ovaries

50. Which of the following is the process by which plants convert nitrites into nitrates in the soil?

A. Denitrification

B. Nitrification

C. Ammonification

D. Nitrogen assimilation

Answer: B. Nitrification

1. Which of the following is the primary function of the respiratory system in humans?

A. Transport of oxygen

B. Regulation of body temperature

C. Production of hormones

D. Digestion of food

Answer: A. Transport of oxygen

2. Which of the following is responsible for the production of the hormone insulin in the human body?

A. Pancreas

B. Thyroid gland

C. Adrenal glands

D. Pituitary gland

Answer: A. Pancreas

3. Which of the following is the process by which organisms break down glucose to release energy in the presence of oxygen?

A. Respiration

B. Photosynthesis

C. Fermentation

D. Transpiration

Answer: A. Respiration

4. Which of the following is responsible for the transport of oxygen in the bloodstream?

A. Red blood cells

B. White blood cells

C. Platelets

D. Plasma

Answer: A. Red blood cells

5. Which of the following is the primary function of the nervous system?

A. Regulation of body temperature

B. Control and coordination of body activities

C. Production of hormones

D. Exchange of gases

Answer: B. Control and coordination of body activities

6. Which of the following is responsible for the production of sperm cells in males?

A. Testes

B. Ovaries

C. Uterus

D. Fallopian tubes

Answer: A. Testes

7. Which of the following is the process by which green plants use sunlight to convert carbon dioxide and water into glucose and oxygen?

A. Respiration

B. Photosynthesis

C. Fermentation

D. Transpiration

Answer: B. Photosynthesis

8. Which of the following is responsible for the regulation of water and electrolyte balance in the human body?

A. Kidneys

B. Liver

C. Stomach

D. Lungs

Answer: A. Kidneys

9. Which of the following is the function of the enzyme trypsin in the digestive system?

A. Breakdown of carbohydrates

B. Breakdown of lipids

C. Breakdown of proteins

D. Synthesis of DNA

Answer: C. Breakdown of proteins

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10. Which of the following is responsible for the transmission of genetic information from parents to offspring?

A. DNA

B. RNA

C. Protein

D. Lipid

Answer: A. DNA

11. Which of the following is the process by which organisms produce offspring that are genetically identical to themselves?

A. Fertilization

B. Mitosis

C. Meiosis

D. Replication

Answer: B. Mitosis

12. Which of the following is responsible for the production of the hormone adrenaline in response to stress or danger?

A. Pancreas

B. Thyroid gland

C. Adrenal glands

D. Pituitary gland

Answer: C. Adrenal glands

13. Which of the following is the primary function of the circulatory system in humans?

A. Exchange of gases

B. Regulation of body temperature

C. Absorption of nutrients

D. Production of hormones

Answer: A. Exchange of gases

14. Which of the following is responsible for the breakdown of old red blood cells and recycling of their components?

A. Lymph nodes

B. Spleen

C. Tonsils

D. Liver

Answer: B. Spleen

15. Which of the following is the process by which a single fertilized egg cell develops into a multicellular organism?

A. Cell division

B. Cell differentiation

C. Embryogenesis

D. Organogenesis

Answer: C. Embryogenesis

16. Which of the following is the process by which plants convert light energy into chemical energy in the form of glucose?

A. Respiration

B. Photosynthesis

C. Fermentation

D. Transpiration

Answer: B. Photosynthesis

17. Which of the following is responsible for the production of the hormone estrogen in females?

A. Ovaries

B. Testes

C. Adrenal glands

D. Pineal gland

Answer: A. Ovaries

18. Which of the following is the process by which a sperm cell fuses with an egg cell to form a zygote?

A. Fertilization

B. Implantation

C. Replication

D. Ovulation

Answer: A. Fertilization

19. Which of the following is responsible for the transmission of nerve impulses between neurons?

A. Hormones

B. Neurotransmitters

C. Enzymes

D. Red blood cells

Answer: B. Neurotransmitters

20. Which of the following is the function of the enzyme lipase in the digestive system?

A. Breakdown of carbohydrates

B. Breakdown of lipids

C. Breakdown of proteins

D. Synthesis of DNA

Answer: B. Breakdown of lipids

21. Which of the following is responsible for the transport of nutrients and waste products in a plant?

A. Xylem

B. Phloem

C. Epidermis

D. Stomata

Answer: B. Phloem

22. Which of the following is the process by which plants respond to gravity by growing in the direction of gravity?

A. Phototropism

B. Gravitropism

C. Hydrotropism

D. Thigmotropism

Answer: B. Gravitropism

23. Which of the following is responsible for the production of the hormone growth hormone (GH)?

A. Pituitary gland

B. Thyroid gland

C. Adrenal glands

D. Pancreas

Answer: A. Pituitary gland

24. Which of the following is the process by which genetic information is transferred from DNA to mRNA?

A. Transcription

B. Translation

C. Replication

D. Transformation

Answer: A. Transcription

25. Which of the following is responsible for the elimination of waste products from the human body?

A. Lungs

B. Skin

C. Liver

D. Kidneys

Answer: D. Kidneys

26. Which of the following is responsible for the production of the hormone testosterone in males?

A. Testes

B. Ovaries

C. Adrenal glands

D. Thyroid gland

Answer: A. Testes

27. Which of the following is the process by which plants release excess water vapor through their stomata?

A. Osmosis

B. Transpiration

C. Diffusion

D. Active transport

Answer: B. Transpiration

28. Which of the following is responsible for the regulation of blood sugar levels in the human body?

A. Pancreas

B. Gallbladder

C. Spleen

D. Esophagus

Answer: A. Pancreas

29. Which of the following is the function of the enzyme pepsin in the stomach during digestion?

A. Breakdown of carbohydrates

B. Breakdown of lipids

C. Breakdown of proteins

D. Synthesis of DNA

Answer: C. Breakdown of proteins

30. Which of the following is responsible for the regulation of the sleep-wake cycle and other daily rhythms in humans?

A. Pineal gland

B. Thyroid gland

C. Adrenal glands

D. Pituitary gland

Answer: A. Pineal gland

GCSE Biology Quiz Questions with answers pdf download online exam testÂ