Growth is influenced by a number of conditions which are as follows :
(a) Water is required for cell elongation, maintenance of turgidity of growing cells and providing medium for enzyme action.
(b) Oxygen is essential for aerobic respiration and hence availability of energy for biosynthetic activity.
(c) Nutrients are raw materials for synthesis of protoplasm, as well as the source of energy.
(d) Light is required for tissue differentiation, synthesis of photosynthetic pigments and photosynthesis.
(e) The optimum temperature for proper growth is 28-
(f) The vector of gravity determines the direction of
root and shoot growth.