Where is water mainly absorbed in the alimentary canal?

Correct Answer: C

Rationale: The large intestine absorbs most of the remaining water from digested material, forming semi-solid feces.

Correct Answer: C

Rationale: The soft palate elevates during swallowing to close off the nasopharynx, preventing food from entering the nasal cavity. The epiglottis prevents entry into the trachea.

Correct Answer: A

Rationale: Fungiform papillae appear red due to their thin epithelium and rich vascularity in the connective tissue, not because of secondary papillae structure.

Correct Answer: B

Rationale: Meissner's plexus is located in the submucosa and regulates glandular secretion and local blood flow.

Correct Answer: B

Rationale: During active HCl secretion, parietal cells' intracellular canaliculi expand with numerous microvilli, and the tubulovesicular system decreases as it fuses with the canaliculi.