The structure that produces antibodies is: MCQ with Answer and Explanation

Explanation:
Cerebrospinal fluid (CSF) is a clear fluid produced by the choroid plexus in the ventricles of the brain. It cushions the CNS, provides buoyancy, removes waste, and maintains chemical stability. Synovial fluid is in joints, pleural fluid in chest cavity, lymph in lymphatic vessels.

Explanation:
Vitamin K is a fat-soluble vitamin required for the synthesis of clotting factors II (prothrombin), VII, IX, and X in the liver. Deficiency leads to prolonged clotting time and bleeding disorders. Vitamin A is for vision, C for collagen synthesis and antioxidant, E for antioxidant. Vitamin K is found in green leafy vegetables and synthesized by gut bacteria.

Explanation:
The kidneys are the primary excretory organs, filtering blood through nephrons to remove waste products and excess water, forming urine. The liver is a multifunctional organ that produces bile, which is stored in the gall bladder and released into the small intestine to emulsify fats, aiding in their digestion. The spleen is a lymphoid organ involved in filtering blood and immune responses; it does not produce digestive enzymes (the pancreas does). Thus, statements 1 and 2 are correct.