Which of the following tissues provides mechanical strength and flexibility to plant organs? MCQ with Answer and Explanation

Explanation:
Zinc is required for the synthesis, storage (as hexamers), and secretion of insulin in pancreatic beta cells. It also acts as a cofactor for numerous enzymes like carbonic anhydrase and DNA polymerases. Calcium is for bones/signaling, magnesium for ATP and chlorophyll, sodium for nerve impulses.

Explanation:
The infundibulum (pituitary stalk) physically connects the hypothalamus to the pituitary gland, transporting hormones and nerve signals.

Explanation:
Bacteria exhibit diverse roles; many are beneficial (e.g., gut flora, nitrogen fixers, decomposers), while some are pathogenic and cause diseases. Fungi are extensively used in food production, such as yeast (Saccharomyces) in baking and brewing, and molds (Penicillium) in cheese making (e.g., Roquefort, Camembert). Viruses are considered non-living outside a host cell because they lack metabolic machinery and cannot replicate independently; they only exhibit living characteristics when inside a host. Thus, statements 1 and 2 are correct.