The type of nutrition in which two organisms of different species live together and derive nutrients from each other is

Step 1: Analyze the question The question describes two organisms of different species living together, with both getting nutrients from each other. This is a mutual feeding relationship.

Step 2: Explain the concepts

• Symbiotic nutrition: Two different species live in close association, and each benefits from the other. Examples: nitrogen-fixing bacteria (Rhizobium) in the root nodules of legumes, and the alga and fungus in lichens.
• Saprophytic nutrition: An organism feeds on dead or decaying organic matter (e.g., mushrooms and moulds on rotting wood).
• Holozoic nutrition: An organism ingests solid food, digests it internally, then absorbs and assimilates it (e.g., humans, dogs, goats).
• Holophytic nutrition: Also called autotrophic or photosynthetic nutrition. Green plants make their own food from simple inorganic substances.

Step 3: Solve by elimination

• B is wrong because it involves feeding on dead matter, not two living species exchanging nutrients.
• C is wrong because it describes how an animal takes in food, with no partnership involved.
• D is wrong because it describes self-feeding by plants and involves only one organism.
• A fits perfectly: two species, living together, each deriving nutrients from the other.

Step 4: Answer The correct option is A. symbiotic nutrition.

Exam tip: Break the word down. "Sym" means together and "bios" means life, so symbiosis is "living together." Also remember the other keywords: saprophytic = dead matter, holozoic = animal-like feeding, holophytic = plant-like feeding.