C
CraftExam
high importancemedium difficulty6 min

Heterotrophic nutrition

Heterotrophic nutrition is the mode in which organisms depend on other organisms or organic matter for food.

In one line: If it cannot make food, it depends on others.

Practice This Concept

Understand it

Animals, fungi, and many bacteria cannot make food from simple substances like green plants do. They take ready-made food in different ways: holozoic, saprotrophic, or parasitic. This concept helps us compare feeding methods across living organisms.

Example

Human beings eat cooked food, fungi absorb nutrients from dead matter, and Cuscuta draws food from a host plant.

Rule to remember

Rule: Heterotrophs depend on ready-made organic food from other living beings or dead matter.

See it worked out

Follow the example line by line, then use the same method on new questions.

Worked example

A dog eats food, digests it inside the body, and absorbs nutrients.

  1. 1A mushroom grows on dead wood and absorbs nutrients from it.
  2. 2Both are heterotrophs, but their methods differ.

Method you can reuse

  1. 1State dependence on others.
  2. 2Name the type.
  3. 3Give a correct example.
  4. 4Mention how food is obtained.
  5. 5Compare with autotrophic nutrition.

Visual tip

A comparison table works well: holozoic, saprotrophic, and parasitic with one example each.

Check yourself

Answer the question in your head before opening the answer.

Try it yourself

Why is a mushroom called a heterotroph?

Think first, then show answer
A mushroom is called a heterotroph because it cannot make its own food and depends on dead or decaying organic matter for nutrition.

Common wrong answer

Heterotrophs are only animals.

Why it loses marks: Fungi and many bacteria are also heterotrophs.

Don't mix this up

Students think all heterotrophs digest food in the same place or in the same way.

Exam tip

Learn the three main types and give one correct example for each.

Write it in the exam

Each point is worth about one mark. Write point 1 for a 1-mark question and keep adding points as the marks go up.

How CBSE asks it

Explain heterotrophic nutrition, classify examples, or compare saprotrophic and parasitic nutrition.
  1. 1

    Enough for 1 mark

    Heterotrophic nutrition is the mode in which organisms depend on other organisms or organic matter for food.

  2. 2

    Add for 2 marks

    Example: Human beings eat cooked food, fungi absorb nutrients from dead matter, and Cuscuta draws food from a host plant.

  3. 3

    Add for 3 marks

    Animals, fungi, and many bacteria cannot make food from simple substances like green plants do.

MCQ Quiz

Practice this concept with focused MCQs

Open the concept quiz intro first, review the test details, and then start a focused MCQ set from this concept only. Instant score and answer review are live now.

10 MCQs5 MinutesInstant Results
Practice This Concept

Help improve this page

Found something confusing, incorrect, or missing?

Practice This Concept