Explain the three pathways of breakdown of glucose in living organisms.

Choose the correct path of urine in our body.

During the respiration of an organism $A$,one molecule of glucose produces two $ATP$ molecules,whereas in the respiration of another organism $B$,one molecule of glucose produces $38$ $ATP$ molecules.
$(a)$ Which organism is undergoing aerobic respiration?
$(b)$ Which organism is undergoing anaerobic respiration?
$(c)$ Which type of organism,$A$ or $B$,can convert glucose into alcohol?
$(d)$ Name one organism which behaves like $A$.
$(e)$ Name two organisms which behave like $B$.

Why does absorption of digested food occur mainly in the small intestine?

In $Xylem$,minerals in solution form move in both directions (upward and downward).

In which of the following vertebrate group/groups,does the heart not pump oxygenated blood to different parts of the body?