2nd Year Biology 2nd Quarter Book Paper

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

1. In the reflex arc, effectors are usually:
   1. Dendrites
   2. Sensory receptors
   3. Muscles or glands
   4. Axons
2. Which structure does not change its length during contraction?
   1. A band
   2. I band
   3. H zone
   4. Sarcomere
3. Birds and mammals are classified as:
   1. Poikilotherms
   2. Homeotherms
   3. Ectotherms
   4. Amphibians
4. Steroid hormones are secreted by
   1. the adrenal cortex
   2. the gonads
   3. the thyroid
   4. both A and B
5. A receptor cell that converts one form of energy into another is called:
   1. Transmitter
   2. Transducer
   3. Effector
   4. Stimulus
6. Muscle contraction is initiated by:
   1. Hormone impulse
   2. Nerve impulse
   3. Heat stimulus
   4. Blood pressure
7. Which word is not similarly with the others?
   1. ectoderms
   2. endoderms
   3. homeothermic
   4. warm-blooded
8. Hyperthyroidism may cause:
   1. Graves’ disease
   2. Diabetes mellitus
   3. Goiter
   4. Dwarfism
9. Opioids relieve pain by binding to:
   1. Dopamine receptors
   2. Muscle receptors
   3. Opioid receptors
   4. Sodium channels
10. What should be applied to reduce swelling in dislocation or fracture?
    1. Warm towel
    2. Ice pack or cold pack
    3. Oil massage
    4. Bandage only
11. Homeostasis means:
    1. Maintaining constant food supply
    2. Maintaining external environment
    3. Increasing metabolic activity
    4. Keeping internal conditions in balance
12. Prolactin inhibiting factor (PIF) inhibits secretion of:
    1. GH
    2. FSH
    3. Prolactin
    4. ACTH