Nutritionally dependent bacteria are called as?

Appeared in: AIIMS Bhopal NO - 2018 (Shift-1st)

Explanation

The term 'nutritionally dependent' refers to organisms that cannot synthesize their own food.
Heterotrophs are organisms that obtain nutrients by consuming pre-formed organic matter from their environment.
This reliance on external sources for food makes them 'nutritionally dependent'.
Most bacteria, including all medically important bacteria that cause human disease, are heterotrophs.

Option A: Autotrophs are 'self-feeders'. They produce their own food using inorganic carbon (CO₂) and an external energy source (light or chemical reactions). They are nutritionally independent, the opposite of the question's description.
Option C: Phototrophs are classified based on their energy source, which is light. This term does not describe their carbon source or nutritional dependency. A phototroph can be either an autotroph or a heterotroph.
Option D: Chemotrophs are classified based on their energy source, which comes from chemical compounds. This term does not describe their carbon source or nutritional dependency. A chemotroph can be either an autotroph or a heterotroph.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Bacterial Nutritional Classification as background academic context rather than a clinical decision trigger.
Understanding bacterial nutrition is crucial for nurses as most human pathogens are chemoheterotrophs. They cause disease by deriving nutrients from the host's body.
This knowledge helps in understanding the principles of infection control, culture media preparation in labs, and the mechanisms of certain antimicrobial agents.
What if? If a pathogenic bacterium was an autotroph, it wouldn't need to infect a host for nutrients, fundamentally changing its relationship with humans. It might still cause disease through toxin production, but not through parasitic consumption of host tissues.

How to Approach the Question

First, identify the key phrase in the question: 'nutritionally dependent'. This means the organism cannot make its own food.
Next, analyze the options by breaking down the prefixes:
'Auto-' means self.
'Hetero-' means other or different.
'Photo-' means light.
'Chemo-' means chemical.

Concept Tested & Keywords

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E6 Microbiology Applied AnjuDhir 3e Part 1 pp. 76-78, 75-77, 55-57

Practise the full AIIMS Bhopal NO - 2018 (Shift-1st)

Attempt every question from this paper in a timed mock, then review the full solution for each one.