Body Fluids Quiz - CBSE Class 12 Biology

Free practice quiz: Body Fluids (CBSE Class 12 Biology). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is NOT a component of blood plasma?

   1. Water
   2. Proteins
   3. Electrolytes
   4. Hemoglobin
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   Answer: D. Hemoglobin

   Hemoglobin is the oxygen-carrying pigment found in red blood cells, not in the plasma.

2. Which protein in blood plasma is responsible for blood clotting?

   1. Albumin
   2. Globulin
   3. Fibrinogen
   4. Hemoglobin
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   Answer: C. Fibrinogen

   Fibrinogen is a key protein involved in the coagulation cascade leading to blood clot formation.

3. How does the lymphatic system contribute to the body's defense mechanisms?

   1. It transports oxygen to cells
   2. It filters waste products from the blood
   3. It produces hormones
   4. It contains lymphocytes that fight infections
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   Answer: D. It contains lymphocytes that fight infections

   The lymphatic system is crucial in the immune response, containing lymphocytes that target and destroy pathogens.

4. Discuss the mechanisms involved in regulating blood volume and composition.

   1. Blood volume is regulated solely by the kidneys.
   2. Multiple hormonal and neural mechanisms regulate blood volume and composition, including the renin-angiotensin-aldosterone system and antidiuretic hormone.
   3. Blood volume is primarily regulated by the heart.
   4. There is no mechanism to regulate blood volume.
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   Answer: B. Multiple hormonal and neural mechanisms regulate blood volume and composition, including the renin-angiotensin-aldosterone system and antidiuretic hormone.

   Blood volume and composition are tightly regulated through complex interactions involving kidneys, hormones (ADH, RAAS), and the nervous system.

5. Discuss the interplay between the endocrine system and the body fluid regulatory mechanisms, focusing on the roles of ADH and the renin-angiotensin-aldosterone system (RAAS).

   1. The endocrine system plays no role in fluid regulation.
   2. ADH and RAAS are antagonistic; ADH promotes water retention, while RAAS promotes water excretion.
   3. ADH and RAAS both regulate fluid balance, but through different mechanisms; ADH primarily controls water reabsorption, while RAAS regulates sodium and water balance through effects on the kidneys.
   4. ADH and RAAS are both involved in blood pressure regulation but not fluid regulation.
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   Answer: C. ADH and RAAS both regulate fluid balance, but through different mechanisms; ADH primarily controls water reabsorption, while RAAS regulates sodium and water balance through effects on the kidneys.

   ADH (antidiuretic hormone) increases water reabsorption in the kidneys, while the RAAS (renin-angiotensin-aldosterone system) regulates sodium and water balance, affecting blood volume and pressure.

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