Concept:Fungi are not true plants because they lack chlorophyll, the pigment needed for photosynthesis.Explanation:Fungi do not have chlorophyll, so they cannot make their own food by photosynthesis.Instead, they get nutrients by absorbing them from their surroundings.Their cell wall is made of chitin, not cellulose like in plants.Therefore, the key missing component is chlorophyll.Answer:B. chlorophyll