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1ST_QUARTER_MARCIANO_SCI9
Contributed by: Marciano
  • 1. The dome-shaped muscle responsible for breathing is called:
A) Trachea
B) Valve
C) Diaphragm
D) Bronchi
  • 2. Blood vessels that carry blood away from the heart are called:
A) Capillaries
B) Arteries
C) Venules
D) Veins
  • 3. The smallest blood vessels where exchange of gases occurs are:
A) Capillaries
B) Arteries
C) Veins
D) Venules
  • 4. The voice box is scientifically called:
A) Alveoli
B) Larynx
C) Trachea
D) Pharynx
  • 5. The respiratory system supplies oxygen and removes:
A) Hydrogen
B) Nitrogen
C) Carbon dioxide
D) Water
  • 6. The windpipe is also known as:
A) Alveoli
B) Trachea
C) Bronchus
D) Esophagus
  • 7. The fluid component of blood is:
A) Hemoglobin
B) Platelets
C) Oxygen
D) Plasma
  • 8. Which is the correct order of airflow during inhalation?
A) Nose → Pharynx → Esophagus → Alveoli
B) Nose → Trachea → Bronchi → Alveoli
C) Nose → Alveoli → Bronchi → Trachea
D) Nose → Bronchi → Trachea → Alveoli
  • 9. What is the main function of white blood cells?
A) Clot blood
B) Transport nutrients
C) Defend against infection
D) Carry oxygen
  • 10. Which organ pumps blood throughout the body?
A) Kidney
B) Lungs
C) Brain
D) Heart
  • 11. Which lifestyle factor MOST increases the risk of lung cancer?
A) Healthy diet
B) Sleeping early
C) Smoking
D) Exercise
  • 12. What happens to the heart rate during regular exercise?
A) Stays the same
B) Increases permanently
C) Decreases efficiency
D) Becomes more efficient
  • 13. Which factor lowers the risk of cardiovascular disease?
A) Smoking
B) Regular physical activity
C) Sedentary lifestyle
D) High-salt diet
  • 14. Which inheritance shows blending of traits?
A) Incomplete dominance
B) Codominance
C) Multiple alleles
D) Sex-linked
  • 15. In codominance, what happens to the traits of both parents?
A) Both are expressed
B) Only recessive is expressed
C) One is hidden
  • 16. A pink flower from red and white parents shows:
A) Incomplete dominance
B) Codominance
C) Polygenic
D) Multiple alleles
  • 17. Which alleles control human blood type?
A) X, Y
B) H, h
C) A, B, O
D) T, t
  • 18. Baldness in males is an example of:
A) Polygenic
B) Incomplete dominance
C) Codominance
D) Sex-influenced trait
  • 19. Which condition results from having an extra chromosome 21?
A) Turner’s syndrome
B) Down syndrome
C) Hemophilia
D) Klinefelter’s syndrome
  • 20. If a red cow and white cow produce a roan calf, the inheritance pattern is:
A) Polygenic
B) Incomplete dominance
C) Codominance
D) Multiple alleles
  • 21. Which is NOT an example of non-Mendelian inheritance?
A) Incomplete dominance
B) Simple dominance
C) Codominance
  • 22. Which inheritance pattern involves genes located on sex chromosomes?
A) Codominance
B) Multiple alleles
C) Sex-linked
D) Polygenic
  • 23. If a person has genotype IAi, his blood type is:
A) Type O
B) Type OA
C) Type A
D) Type AB
  • 24. What is the chronic respiratory condition that causes difficulty in breathing due
    to inflammation of the airways?
A) Bronchitis
B) Emphysema
C) Asthma
D) Pneumonia
  • 25. Which organ system delivers oxygen and nutrients to body tissues?
A) Nervous System
B) Excretory System
C) Digestive System
D) Circulatory system
  • 26. What separates the chest cavity from the abdominal cavity and aids breathing?
A) Ribcage
B) Epiglottis
C) Diaphragm
D) Larynx
  • 27. Which part of the respiratory system warms, moistens, and filters the air?
A) Bronchi
B) Alveoli
C) Trachea
D) Nose
  • 28. Lack of physical activity may lead to:
A) Stronger heart
B) Better lung function
C) Obesity and hypertension
D) Healthy arteries
  • 29. Which type of inheritance allows for more than two possible alleles for a trait?
A) Codominance
B) Polygenic inheritance
C) Multiple alleles
D) Incomplete dominance
  • 30. Which blood type shows codominance of A and B alleles?
A) Type AB
B) Type A
C) Type B
D) Type O
  • 31. Which chromosome pair determines the sex of humans?
A) Hemoglobin pair
B) 1–22 autosomes
C) X and Y chromosomes
D) Chromosome 21
  • 32. The main function of the respiratory system is:
A) Exchanging gases
B) Breaking down food
C) Pumping blood
D) Sending signals
  • 33. The circulatory system is also known as the:
A) Lymphatic system
B) Cardiovascular system
C) Skeletal system
D) Digestive system
  • 34. Which blood vessel carries blood back to the heart?
A) Arteries
B) Capillaries
C) Veins
D) Bronchi
  • 35. Which part of the blood fights infection?
A) Red blood cells
B) White blood cells
C) Plasma
D) Platelets
  • 36. A runner takes deep breaths after a sprint. Which system primarily helps restore balance?
A) Respiratory system
B) Circulatory System
C) Endocrine System
D) Nervous System
  • 37. A person with asthma attacks should avoid:
A) Dust and smoke
B) Exercise
C) Drinking water
D) Fresh air
  • 38. Which situation demonstrates codominance?
A) A black chicken and white chicken produce speckled offspring
B) A white flower and red flower produce pink flowers
C) Brown-eyed and blue-eyed parents producing green-eyed children
D) Tall and short parents producing medium offspring
  • 39. If a father is color-blind and the mother is a carrier, their son has what probability of being color-blind?
A) 25%
B) 50%
C) 75%
D) 100%
  • 40. Which lifestyle change will most improve circulatory health?
A) Increase salt intake
B) Avoid fruits
C) Eat processed foods
D) Quit smoking
  • 41. A student notes that his pulse rate increases after jogging. What explains this?
A) The nervous system shuts down
B) The lungs collapse
C) The body needs more oxygen
D) Blood volume decreases
  • 42. Which best explains why multiple alleles traits vary widely in a population?
A) They involve many genes
B) They are sex-linked
C) They skip generations
D) They are caused by environment alone
  • 43. Which situation best shows incomplete dominance?
A) A red flower and white flower produce pink offspring
B) A black chicken and white chicken produce only black offspring
C) A tall and short plant produce a tall plant
D) A red cow and white cow produce a roan calf
  • 44. Why does the body increase breathing rate during exercise?
A) To store more oxygen in stomach
B) To release more carbon dioxide
C) To increase bone growth
D) To prevent sweating
  • 45. A farmer crossbreeds a red flower (RR) and white flower (WW). The offspring are all pink (RW). Which inheritance is this?
A) Codominance
B) Incomplete dominance
C) Polygenic inheritance
D) Simple dominance
  • 46. Which school activity BEST integrates knowledge of non-Mendelian inheritance?
A) Designing Punnett squares for codominance and incomplete dominance
B) Painting random pictures
C) Ignoring genetics in biology class
D) Playing unrelated video games
  • 47. A city wants to lower rates of respiratory disease. Which program is BEST?
A) Encourage longer screen time for students
B) Build more gyms and promote fitness
C) Increase the price of healthy food
D) Reduce air pollution and enforce anti-smoking laws
  • 48. If tasked to evaluate the risks of poor diet, which statement is MOST accurate?
A) Poor diet improves lung function
B) Poor diet has no effect if you are young
C) Poor diet may lead to obesity, heart disease, and diabetes
D) Poor diet only affects appearance, not health
  • 49. Which conclusion is most accurate about lifestyle diseases?
A) They cannot be prevented
B) They are always inherited
C) They can be prevented by healthy habits
D) They are caused only by pollution
  • 50. A student is designing a campaign to prevent respiratory illnesses. Which slogan is most effective?
A) “Eat Fast Food Now!”
B) “Ignore Your Health”
C) “Stay Awake All Night!”
D) “Say No to Smoking, Say Yes to Breathing Free!”
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