Vaccination provides which type of immunity? MCQ with Answer and Explanation

Explanation:
Peptide YY (PYY) is a gut hormone secreted by the L cells in the mucosa of the distal small intestine (ileum) and colon, primarily in response to food ingestion, especially fats. Its primary functions are related to the 'ileal brake' mechanism: it inhibits gastric emptying and pancreatic exocrine secretion, slowing down the transit of food through the upper GI tract to allow more time for digestion and absorption in the ileum. It also acts on the hypothalamus to reduce appetite, serving as a satiety signal.

Explanation:
Lacrimal glands, located above the outer corner of each eye, produce tears that lubricate and protect the eye surface. Parotid and sublingual are salivary glands, ceruminous glands produce ear wax.

Explanation:
Maize (corn), sugarcane, and sorghum are classic examples of C4 plants. They possess Kranz anatomy, where bundle sheath cells contain chloroplasts. C4 plants initially fix CO2 into a 4-carbon compound (oxaloacetate) using PEP carboxylase in mesophyll cells, which minimizes photorespiration and increases photosynthetic efficiency in hot, dry climates.