Define Apical dominance

The figures given below depict a phenomenon of the plants. Study the figure and answer the questions.

(i) Name and define the phenomenon.

(ii) Name the structure shown as X and Y in the figure (A) and (B), respectively.

(iii) Write the functions performed by the structures X and Y.

What are Phytohormones ? Give one example.

What is the significance of transpiration. State in two points.