Consider statements about human digestion: 1. Saliva contains the enzyme ptyalin. 2. The stomach secretes hydrochloric acid. 3. Bile is produced by the gall bladder. Which are correct? MCQ with Answer and Explanation

Explanation:
Bt cotton is genetically modified by inserting the cry gene from Bacillus thuringiensis, which produces an insecticidal protein toxic to bollworms. Triticale is a hybrid of wheat and rye (not GM per se), Brassica napus is rapeseed (canola) which may have GM varieties, but Bt cotton is a classic example. GM crops include Bt brinjal, herbicide-tolerant soybeans.

Explanation:
The medulla oblongata contains vital centers that control involuntary functions like heart rate, breathing, and blood pressure. The cerebrum is responsible for memory, intelligence, and voluntary movements; the cerebellum coordinates balance and movement; the hypothalamus regulates body temperature, hunger, and hormone secretion.

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.