Question

All fungi are
A. Symbionts
B. Parasites
C. Saprophytes
D. Heterotrophs.

Answer 1

Previously, fungi were included in the plant kingdom; however, because fungi lack chlorophyll and are recognized by specific physiological and structural characteristics like composition of the cell membrane and cell wall, they are different from plants.

Complete answer:
To answer this question, first, we need to know about fungi. Fungi are eukaryotic organisms, their cells consist of membrane enclosed organelles and distinct nuclei. Also fungi are easily differentiated from all other living organisms such as animals, based on their main ways of vegetative development and nutrient absorption. Fungi develop from the tops of filaments that composed the bodily structures of the organisms (mycelia), and they dissolved organic matter exteriorly before taking it into their mycelia.
Now, let us find the solution from the option.
Symbiosis is a close and prolonged interaction between organisms of various species. Other types of symbiotic relationships are parasitism and commensalism.
A parasitic organism stays on or in a host organism and gets its food from or at the cost of its host.
Saprophytes are the living organisms that live and feed on dead and decaying organisms.
A heterotroph is an organism that depends on another for food. Since, these organisms lack the mechanisms to use sunlight and inorganic compounds to produce their own food and derive energy they depend on organisms that are either dead or alive. All fungi constitute this group of organisms that live on sources of food and digest and absorb nutrients from them.

Thus, the correct option is D. i.e. Heterotrophs.

Note: Fungi are enabled to make their own food; they must collect carbohydrates and other nutrients from the plants, animals or decomposed matter on which they stay or live. The fungi are usually recognized as heterotrophs that depend on other organisms for nutrients and also for metabolism.