The S-A node (sinoatrial node) is located in the: MCQ with Answer and Explanation

Explanation:
Sucrose (table sugar) is a disaccharide composed of glucose and fructose. Glucose and fructose are monosaccharides, glycogen is a polysaccharide. Other disaccharides include maltose and lactose.

Explanation:
The infundibulum connects them, and hypothalamic releasing/inhibiting hormones travel to the anterior pituitary; posterior pituitary stores hypothalamic hormones. R correctly explains A.

Explanation:
A lichen is a classic example of mutualism between a fungus (mycobiont) and an alga or cyanobacterium (phycobiont). The algal partner performs photosynthesis and provides organic food to the fungus. In return, the fungal partner provides a protective environment, absorbs water and minerals, and anchors the lichen to the substrate. Mycorrhiza is a mutualism between fungi and plant roots, and Rhizobium is a mutualism between bacteria and legume roots.