Question 81 markMCQSection A

An organism which breaks down the food material outside the body and then absorbs it is

Life Processes
Heterotrophic Nutrition

Options

(a)a plant parasite, Cuscuta
(b)an animal parasite, Tapeworm
(c)a bacteria, Rhizobium
(d)a fungi, Rhizopus

Official answer

d

Answer keywords:Rhizopusbread mouldfungisaprophytic nutritionextracellular digestion

Marking scheme

  1. 1.1 mark for selecting the correct option (d).

Hint

Think of organisms like bread moulds, yeast, and mushrooms that grow on decaying organic matter and perform extracellular digestion.

Quick oral answer

Rhizopus is a fungus (bread mould) that performs saprophytic nutrition by releasing enzymes to break down food outside its body and then absorbing the simplified nutrients.

Common mistakes

  1. 1.Students often confuse parasitic nutrition (like Cuscuta) with saprophytic nutrition (like Rhizopus). Parasites live on or inside a host, whereas saprophytes break down dead organic matter outside their bodies.

Analysis and explanation

The correct option is (d). Organisms like fungi (such as bread moulds, yeast, and mushrooms) break down complex food materials outside their body into simpler substances and then absorb them. Rhizopus is a common bread mould (fungus) that exhibits this saprophytic mode of nutrition.


  • Option (a) is incorrect because Cuscuta (amar-bel) is a parasitic plant that derives nutrition directly from a host plant without killing it, rather than breaking down food externally.
  • Option (b) is incorrect because Tapeworm is an internal parasite that absorbs already digested food from the host's intestine.
  • Option (c) is incorrect because Rhizobium is a symbiotic bacterium that fixes atmospheric nitrogen and does not perform extracellular saprophytic digestion.

Interesting facts

Rhizopus stolonifer, commonly known as black bread mould, releases digestive enzymes directly onto the bread surface to dissolve starch into simple sugars before absorbing them.

Question details

Q8 of 39 questions

Board
CBSE
Class
Class 10
Subject
Science
Year
2023
Section
Section A
Marks
1
Type
MCQ
Chapter
Life Processes
Topic
Heterotrophic Nutrition
Bloom's level
Remembering
Syllabus topic
Modes of Nutrition - Heterotrophic (Saprophytic)

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Frequently asked questions

How many marks does this question carry in CBSE Class 10 Science 2023?

This question carries 1 mark in the CBSE Class 10 Science 2023 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Life Processes" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Heterotrophic Nutrition" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2023 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2023 paper.