2nd Year Biology Chapter 1 TestTHERMOREGULATION AND OSMOREGULATION

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

1. Which of the following is an example of negative feedback?

   1. Blood clotting

   2. Regulation of blood glucose levels

   3. Labor and childbirth

   4. Cytokine storm during infection

2. The expansion of blood capillaries lying just beneath the epidermis of the skin to remove excess heat is called:

   1. Vasoconstriction

   2. Vasodilation

   3. Hyperthermia

   4. Hypothermia

3. To conserve water, kidneys convert highly toxic ammonia into less toxic substances called:

   1. Chitin or keratin

   2. Glucose or fructose

   3. Urea or uric acid

   4. Amino acids or proteins

4. Animals that excrete ammonia directly into the water as their major nitrogenous waste are known as:

   1. Ammonotelics

   2. Ureotelic

   3. Uricotelic

   4. Osmoconformers

5. Regulatory processes where the output or product of a system controls its own behavior are called:

   1. Metabolic pathways

   2. Feedback mechanisms

   3. Linear pathways

   4. Stimulus pathways

6. Which organ, structure, or system acts as a control centre in homeostasis?

   1. Muscles

   2. Skin cells

   3. Brain and spinal cord

   4. Blood vessels

7. How do freshwater animals compensate for the continuous entry of water into their bodies?

   1. By drinking large amounts of water

   2. By producing large volumes of diluted urine

   3. By excreting concentrated urine

   4. By pumping salts out of their bodies

8. Animals that allow their internal osmotic concentration to match their environment are called:

   1. Osmoregulators

   2. Thermoconformers

   3. Osmoconformers

   4. Hypertonics

9. Specialized structures that detect changes in the internal or external environment are called:

   1. Effectors

   2. Control centres

   3. Receptors

   4. Hormones

10. Reptiles have waterproof scales made of which protein?

    1. Chitin

    2. Keratin

    3. Collagen

    4. Fibrin