Rhizosphere microflora exhibits
(A) Symbiosis
(B) Parasitism
(C) Commensalism
(D) Space parasitism

Hint:-The term symbiosis is something used in the same as mutualism. ‘Symbiosis’ simply means
living together. In the narrowest sense, it is used to describe an association in which two species are
deriving mutual benefit. However, now this term is used in a broad sense to describe all types of
interactions. So, symbiosis is a close ecological relationship between the individuals of two different
species.

Complete step-by-step solution:-
(A) Symbiosis: A wide range of microbes in the rhizosphere can promote plant growth, orchestrated
by their ability to communicate with plants using chemical signals. Bacteria and fungi known to
suppress plant diseases do so through the production of at least three types of compounds. These
include phytohormones, volatile organic compounds including acetoin, and phenazines-a diverse
class of heterocyclic compounds. Also, some microbes secret compounds that stimulate the plant to
produce phytohormones. The use of these compounds in agriculture is an active area of research.
(B) Parasites: Parasitism is a relationship between two organisms in which one species benefits for
growth and reproduction and other species harmed. The host is the organism from which the
parasite derives benefits. A parasite is an organism that obtains its nutrients from one or a very few
host individuals, normally causing harm not causing death immediately.
(C) Commensalism: The same commensalism purpose can be ranged as asymmetric versions of
mutualism. The commensalism which one species benefits and the other are neither. Harmed nor
benefited.
 (D) Parasite: Space parasite is a plant parasite that depends on other plants for space and growth
but not for water and nutrients.
So, the correct answer is option A

Note:- Note- Rhizosphere is also called soil microbes. Rhizosphere microorganisms live in close association with plants, both benefiting each other. In this association both the organisms are
independent and do not harm each other. This mutual relationship between the organisms is known as Symbiosis.