Junior Health Inspector Grade II 2023 — Kerala PSC PYQ Practice with Answers

Correct answer (Option A):\nThe placenta is a temporary organ that connects the developing fetus to the uterine wall. It facilitates nutrient uptake, waste elimination, and gas exchange via the mother's blood supply, acting directly in contact with the endometrium. Option A is correct.\n\nWhy others are wrong:\nOption B connects the fetus to the placenta but is not in direct contact with the endometrium. Option C is where fertilization occurs. Option D is the fluid-filled sac protecting the embryo.\n\nRemember:\nThe placenta also functions as an endocrine gland, secreting hormones like hCG, progesterone, and estrogen essential for maintaining pregnancy.

Correct answer (Option C):\nGas exchange in the lungs takes place across the respiratory membrane, which consists of the alveolar walls and the capillary network of alveoli surrounding them. Oxygen diffuses into the blood, and carbon dioxide diffuses into the alveoli. Option C is correct.\n\nWhy others are wrong:\nOption A refers to the anterior part of the nasal cavity. Option B is a passage in the brain or infundibulum of the uterine tube. Option D represents conducting passages where no gas exchange occurs.\n\nStudy tip:\nThe alveoli provide a massive surface area (around 70 square meters in adults) maximized for efficient diffusion of gases.

Correct answer (Option D):\nCalcium ions (Factor IV) are absolutely essential for both the intrinsic and extrinsic pathways of blood coagulation. Calcium acts as a cofactor in the activation of clotting factors like prothrombin into thrombin. Option D is correct.\n\nWhy others are wrong:\nOption A regulates extracellular fluid volume and osmotic pressure. Option B is vital for intracellular fluid balance and nerve transmission. Option C is crucial for bone formulation and energy storage but not blood clotting.\n\nRemember:\nBlood banks use chelating agents like EDTA or sodium citrate to bind calcium ions, preventing stored blood from clotting.

Correct answer (Option B):\nOsteoblasts are the specialized cells responsible for bone formation. They synthesize and secrete the organic constituents of the bone matrix, including collagen fibers, and initiate calcification to harden the matrix. Option B is correct.\n\nWhy others are wrong:\nOption A forms cartilage tissue, not bone tissue. Option C consists of bone-resorbing cells that break down matrix. Option D represents mature bone cells derived from osteoblasts that maintain daily metabolism.\n\nStudy tip:\nThink of 'B' in OsteoBlasts for Bone Building, and 'C' in OsteoClasts for Bone Crushing/cutting.

Correct answer (Option B):\nAccording to the official PSC Answer Key, Option B (Temporal) is selected. Sensory taste pathways from the anterior two-thirds of the tongue travel via the facial nerve, and the posterior one-third via the glossopharyngeal nerve, eventually projecting to cortical areas processing gustatory stimuli. Option B is correct.\n\nWhy others are wrong:\nOption A generally processes somatosensory inputs like touch, pressure, and pain. Option C handles voluntary motor actions and higher cognition. Option D is completely dedicated to processing visual information.\n\nRemember:\nThe primary gustatory cortex is anatomically located deep near the intersection of the parietal operculum and insula, closely associated with the superior temporal regions.