The polysaccharide that forms the major structural component of plant cell walls is: MCQ with Answer and Explanation

Explanation:
Biodiversity hotspots are biogeographic regions with high levels of species richness and endemism that are under threat. The Western Ghats and Sri Lanka, along with the Himalayas, are recognized biodiversity hotspots in India. They harbor a vast array of flora and fauna, many of which are found nowhere else in the world, due to their unique geographical and climatic conditions.

Explanation:
Lateral meristems, namely vascular cambium and cork cambium, are responsible for secondary growth, increasing the girth of stems and roots in dicots and gymnosperms. Apical meristem causes primary growth in length, intercalary meristem elongates nodes, ground meristem forms ground tissue.

Explanation:
Glucagon, secreted by alpha cells of the pancreas when blood glucose is low, binds to liver receptors activating glycogenolysis (glycogen → glucose) and gluconeogenesis. Insulin promotes glycogenesis (glucose → glycogen). Thyroxine affects metabolism, somatostatin inhibits both insulin and glucagon.