The element present in the center of the chlorophyll molecule is: MCQ with Answer and Explanation

Explanation:
Bacteria exhibit diverse nutritional modes; some are autotrophic (photosynthetic like cyanobacteria or chemosynthetic), while others are heterotrophic (saprophytic or parasitic). Fungi are eukaryotic organisms, characterized by having a true nucleus and membrane-bound organelles, and are heterotrophic. Viruses are considered non-living outside a host cell because they lack metabolic machinery and cannot replicate independently; they only exhibit living characteristics inside a host. Thus, statements 1 and 3 are correct.

Explanation:
Beta cells of the islets of Langerhans secrete insulin, which lowers blood glucose. Alpha cells secrete glucagon (raises glucose), delta cells somatostatin, and acinar cells produce digestive enzymes.

Explanation:
Gibberellins (GAs) promote stem elongation. In rosette plants (like cabbage, beet, and radish) that have a short stem and closely packed leaves, the application of gibberellin induces sudden and rapid stem elongation just before flowering, a phenomenon known as 'bolting'. This is widely used in agriculture.