Endocytosis, passive diffusion, facilitated diffusion and active diffusion are all different types of processes by which plants incorporate nutrients from outside.
Endocytosis is the process by which the cell puts a pseudopodia towards a substance, covers it up and incorporates it inside the cell inside a layer of cell membrane. Thus it forms a food vacuole which fuses with the primary lysozome to form secondary lysozome.
The passive transport is something which is taken inside cell by means of simple diffusion. Examples include carbon dioxide and oxygen.
The facilitated diffusion is the process where the nutrients are actually taken inside the cell by means of simple diffusion but with the help of some transport proteins. Examples include water, glucose etc.
Active transport include the nutrients being taken up by the expense of energy against the concentration gradient. Examples include amino acids, fatty acids etc.
