2nd Year Biology Chapter 8 Test08. Themoregulation , Homeostasis

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Birds and mammals are classified as:
   1. Poikilotherms
   2. Homeotherms
   3. Ectotherms
   4. Amphibians
2. Which word is not similarly with the others?
   1. ectoderms
   2. endoderms
   3. homeothermic
   4. warm-blooded
3. Homeostasis means:
   1. Maintaining constant food supply
   2. Maintaining external environment
   3. Increasing metabolic activity
   4. Keeping internal conditions in balance
4. Homeostasis
   1. must always be restored using negative feedback mechanisms
   2. provides for the tight regulation of all physiological variables
   3. is the sum of all chemical reactions in the body
   4. is a combination of positive and negative feedback mechanisms
5. Freshwater animals face the problem of:
   1. Loss of salts and excess water intake
   2. Gain of salts and dehydration
   3. Gain of water and gain of salts
   4. Excess glucose absorption
6. Which of the following components of a homeostatic regulatory mechanism is responsible for detecting a stimulus?
   1. an effector
   2. a control center
   3. a receptor
   4. an afferent pathway
7. The maintenance of constant osmotic conditions in the body is called:
   1. Homeostasis
   2. Osmoregulation
   3. Excretion
   4. Thermoregulation
8. Which of the following are examples of osmoconformers?
   1. Amphibians and reptiles
   2. Birds and mammals
   3. Freshwater teleosts
   4. Marine invertebrates and hagfishes
9. Which hormone increases metabolic rate during cold stress?
   1. Insulin
   2. Thyroxine
   3. Adrenaline
   4. Cortisol
10. Which response occurs when blood temperature drops?
    1. Sweating
    2. Vasodilation
    3. Vasoconstriction
    4. None of these