2nd Year Biology First half Book Paper

Q1. Multiple choice questions (Attempt all · 17 × 1 = 17)

1. Steroid hormones are secreted by
   1. the adrenal cortex
   2. the gonads
   3. the thyroid
   4. both A and B
2. Which structure does not change its length during contraction?
   1. A band
   2. I band
   3. H zone
   4. Sarcomere
3. 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
4. In the reflex arc, effectors are usually:
   1. Dendrites
   2. Sensory receptors
   3. Muscles or glands
   4. Axons
5. What percent of nephron enters medulla?
   1. nephron loop
   2. proximal convoluted tubule
   3. distal convoluted tubule
   4. papillary duct
6. Birds and mammals are classified as:
   1. Poikilotherms
   2. Homeotherms
   3. Ectotherms
   4. Amphibians
7. Which of the following is the respiratory surface in human respiratory system?
   1. larynx
   2. trachea
   3. bronchi
   4. alveoli
8. Which structure prevents food from entering the trachea during swallowing?
   1. Epiglottis
   2. Soft palate
   3. Tongue
   4. Uvula
9. Hyperthyroidism may cause:
   1. Graves’ disease
   2. Diabetes mellitus
   3. Goiter
   4. Dwarfism
10. Muscle contraction is initiated by:
    1. Hormone impulse
    2. Nerve impulse
    3. Heat stimulus
    4. Blood pressure
11. The approximate diameter of capillaries is:
    1. 0.2 mm
    2. 7 to 9 μm
    3. 1 mm
    4. 5 mm
12. A receptor cell that converts one form of energy into another is called:
    1. Transmitter
    2. Transducer
    3. Effector
    4. Stimulus
13. 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
14. Which word is not similarly with the others?
    1. ectoderms
    2. endoderms
    3. homeothermic
    4. warm-blooded
15. The respiration process at the cellular level is also called:
    1. External respiration
    2. Inhalation
    3. Internal respiration
    4. Exhalation
16. 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
17. Prolactin inhibiting factor (PIF) inhibits secretion of:
    1. GH
    2. FSH
    3. Prolactin
    4. ACTH