NEET UG BIOLOGY Multiple Choice Questions (MCQs)
NEET UG - Biology MCQs
NEET UG Biology - Multiple Choice Questions
106. Which of the following is a respiratory organ in humans?
- A) Lungs
- B) Gills
- C) Skin
- D) Trachea
Answer: A) Lungs
107. In humans, the primary function of the diaphragm during breathing is to:
- A) Increase the volume of the thoracic cavity
- B) Decrease the volume of the thoracic cavity
- C) Regulate the exchange of gases
- D) Control the heart rate
Answer: A) Increase the volume of the thoracic cavity
108. Which of the following volumes refers to the maximum volume of air that can be exhaled after a normal tidal expiration?
- A) Tidal volume
- B) Inspiratory reserve volume
- C) Expiratory reserve volume
- D) Vital capacity
Answer: C) Expiratory reserve volume
109. The primary role of hemoglobin in the blood is to:
- A) Transport oxygen
- B) Transport carbon dioxide
- C) Regulate blood pressure
- D) Aid in clotting
Answer: A) Transport oxygen
110. Which of the following disorders is characterized by inflammation of the airways and difficulty in breathing, often triggered by allergens?
- A) Emphysema
- B) Asthma
- C) Pneumonia
- D) Tuberculosis
Answer: B) Asthma
111. The mechanism of gas exchange in humans primarily occurs in the:
- A) Bronchi
- B) Trachea
- C) Alveoli
- D) Larynx
Answer: C) Alveoli
112. Which of the following best describes the process of transporting oxygen in the blood?
- A) Oxygen is dissolved in plasma.
- B) Oxygen binds with hemoglobin in red blood cells.
- C) Oxygen is transported by lymph.
- D) Oxygen is carried as bicarbonate ions.
Answer: B) Oxygen binds with hemoglobin in red blood cells.
113. The condition where the alveoli are damaged, leading to shortness of breath and reduced oxygen exchange, is known as:
- A) Asthma
- B) Pneumonia
- C) Emphysema
- D) Bronchitis
Answer: C) Emphysema
114. Which of the following is a component of blood that is responsible for clotting?
- A) Red blood cells
- B) White blood cells
- C) Platelets
- D) Plasma
Answer: C) Platelets
115. Which blood group is known as the universal donor?
Answer: D) O
116. The function of lymph in the human body includes all of the following except:
- A) Transporting excess tissue fluid
- B) Absorbing and transporting fatty acids
- C) Filtering pathogens and waste products
- D) Regulating blood pressure
Answer: D) Regulating blood pressure
117. Which of the following is NOT a part of the human circulatory system?
- A) Heart
- B) Blood vessels
- C) Lungs
- D) Lymph nodes
Answer: D) Lymph nodes
118. The phase of the cardiac cycle when the ventricles contract to pump blood is known as:
- A) Diastole
- B) Systole
- C) Relaxation phase
- D) Repolarization
Answer: B) Systole
119. The electrical activity of the heart is measured by:
- A) MRI
- B) X-ray
- C) ECG
- D) CT scan
Answer: C) ECG
120. A condition characterized by high blood pressure and risk of heart disease is known as:
- A) Coronary artery disease
- B) Angina pectoris
- C) Hypertension
- D) Arrhythmia
Answer: C) Hypertension
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