2nd Year Biology 1st Quarter Book Paper

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

1. What percent of nephron enters medulla?
   1. nephron loop
   2. proximal convoluted tubule
   3. distal convoluted tubule
   4. papillary duct
2. Which of the following is the respiratory surface in human respiratory system?
   1. larynx
   2. trachea
   3. bronchi
   4. alveoli
3. Which structure prevents food from entering the trachea during swallowing?
   1. Epiglottis
   2. Soft palate
   3. Tongue
   4. Uvula
4. The heart is stopped during open heart surgery to:
   1. Reduce blood sugar
   2. Keep lungs functioning
   3. Remove cholesterol
   4. Allow repair of heart muscle
5. The walls of the ………… are made more or less permeable to water, depending on the need to conserve water.
   1. ureter
   2. urethra
   3. fibrous capsule
   4. collecting duct
6. The respiration process at the cellular level is also called:
   1. External respiration
   2. Inhalation
   3. Internal respiration
   4. Exhalation
7. Which juice secreted by the alimentary canal plays an important role in the digestion of fats?
   1. pancreatic juice, saliva
   2. mucus, hydrochloric acid
   3. saliva, hydrochloric acid
   4. bile juice, pancreatic juice
8. The approximate diameter of capillaries is:
   1. 0.2 mm
   2. 7 to 9 μm
   3. 1 mm
   4. 5 mm
9. Kidneys function as:
   1. Excretory organs only
   2. Osmoregulatory organs only
   3. Both excretory and osmoregulatory organs
   4. Respiratory organs
10. About 23% of carbon dioxide is carried as:
    1. Carboxyhaemoglobin
    2. Carbaminohaemoglobin
    3. Bicarbonate ions
    4. Dissolved gas
11. Secretin and cholecystokinin are secreted in
    1. pyloric region
    2. ileum
    3. esophagus
    4. duodenum
12. During the period of ejection in the cardiac cycle, the atrioventricular valves are ……… and the semilunar valves are ………
    1. closed, closed
    2. closed, open
    3. open, closed
    4. open, open