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NEET Exam  >  NEET Test  >  Biology Class 11  >  Test: Viroids, Prions and Lichens - NEET MCQ

Viroids, Prions and Lichens - Free MCQ Practice Test with solutions, NEET


MCQ Practice Test & Solutions: Test: Viroids, Prions and Lichens (15 Questions)

You can prepare effectively for NEET Biology Class 11 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Viroids, Prions and Lichens ". These 15 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 15 minutes
  • - Number of Questions: 15

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Test: Viroids, Prions and Lichens - Question 1
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What is the term used to describe infectious agents that consist of abnormally folded proteins, similar in size to viruses?

Detailed Solution: Question 1

The term used to describe infectious agents consisting of abnormally folded proteins, similar in size to viruses, is "prions."

  • These agents are responsible for diseases like mad cow disease (BSE) and Creutzfeldt-Jakob disease (CJD) in humans.

Topic in NCERT: Prions

Line in NCERT: "certain infectious neurological diseases were found to be transmitted by an agent consisting of abnormally folded protein. the agent was similar in size to viruses. these agents were called prions."

Test: Viroids, Prions and Lichens - Question 2
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Match the Column-I with Column-II

Detailed Solution: Question 2

To solve the matching problem, let's align each item from Column-I with its corresponding description in Column-II:

  1. Saprophyte: This term refers to organisms that decompose dead organic materials.

    • Match: (a) → (ii)

  2. Parasite: This term describes organisms that live on living plants or animals.

    • Match: (b) → (iii)

  3. Lichens: Lichens are a symbiotic association between algae and fungi.

    • Match: (c) → (iv)

  4. Mycorrhiza: This is a symbiotic association of fungi with plant roots.

    • Match: (d) → (i)

So, the correct matching is:

  • (a) → (ii)
  • (b) → (iii)
  • (c) → (iv)
  • (d) → (i)

Therefore, the correct answer from the options provided is:

Option 1: (a) (ii), (b) (iii), (c) (iv), (d) (i)

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Test: Viroids, Prions and Lichens - Question 3
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Which of the following statements is wrong for viroids?

Detailed Solution: Question 3

Viroids : In 1971, T.O. Diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease. It was found to be a free RNA; it lacked the protein coat that is found in viruses, hence the name viroid. The RNA of the viroid was of low molecular weight.

Topic in NCERT: Viroids

Line in NCERT: "it was found to be a free rna; it lacked the protein coat that is found in viruses, hence the name viroid. the rna of the viroid was of low molecular weight."

Test: Viroids, Prions and Lichens - Question 4
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Identify the incorrect statement -

Detailed Solution: Question 4

Statement (D) in incorrect as Algae prepare food for fungi and fungi provide shelter and absorb mineral nutrients and water for its partner.

Topic in NCERT: Lichens

Line in NCERT: "lichens are symbiotic associations i.e. mutually useful associations, between algae and fungi. the algal component is known as phycobiont and fungal component as mycobiont, which are autotrophic and heterotrophic, respectively. algae prepare food for fungi and fungi provide shelter and absorb mineral nutrients and water for its partner."

Test: Viroids, Prions and Lichens - Question 5
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Bacteriophage is similar to a fungus & bacterium in having :-

Detailed Solution: Question 5

Bacterial viruses or bacteriophages (viruses that infect the bacteria) are usually double stranded DNA viruses

Test: Viroids, Prions and Lichens - Question 6
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Which of the following diseases is caused by prions in cattle?

Detailed Solution: Question 6

Bovine spongiform encephalopathy, commonly called mad cow disease, as a notable disease caused by prions in cattle.

Topic in NCERT: Prions

Line in NCERT: "the most notable diseases caused by prions are bovine spongiform encephalopathy (bse) commonly called mad cow disease in cattle."

Test: Viroids, Prions and Lichens - Question 7
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Lichens are symbiotic associations between which two types of organisms?

Detailed Solution: Question 7

  • Lichens are symbiotic associations between algae (phycobiont) and fungi (mycobiont).
  • Algae prepare food for fungi, and fungi provide shelter and absorb mineral nutrients and water for their algal partners.

Topic in NCERT: Lichens

Line in NCERT: "lichens are symbiotic associations i.e. mutually useful associations, between algae and fungi."

Test: Viroids, Prions and Lichens - Question 8
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Which of the following is not correctly paired ?

Detailed Solution: Question 8

To determine the incorrectly paired item:
- A: Inert Crystals - Virus
- B: Free RNA - Viroids
- C: Normal protein - Prions
- D: Symbionts - Lichen

The incorrect pairing is: (C)

Prions are folded proteins not normal proteins
 

Topic in NCERT: Prions

Line in NCERT: "prions: in modern medicine certain infectious neurological diseases were found to be transmitted by an agent consisting of abnormally folded protein."

Test: Viroids, Prions and Lichens - Question 9
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"Potato Spindle tuber " disease is caused by a pathogen that is:

Detailed Solution: Question 9

Potato spindle tuber disease is caused by an infectious agent called viroid. Viroids comprise free RNA of low molecular weight. They lack a protein coat that is found in viruses .

Nucleocapsid are viruses .Viruses are crystalline structures as they have a nucleic acid enclosed with a protein coat.

Topic in NCERT: Viroids

Line in NCERT: "viroids: in 1971, t.o. diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease. it was found to be a free rna; it lacked the protein coat that is found in viruses, hence the name viroid. the rna of the viroid was of low molecular weight."

Test: Viroids, Prions and Lichens - Question 10
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Who discovered viroids in 1971, and what disease did they find it caused?

Detailed Solution: Question 10

T.O. Diener discovered a new infectious agent in 1971 that was smaller than viruses and caused potato spindle tuber disease. This agent was identified as a viroid, which is a type of infectious entity that consists of a short strand of RNA without a protein coat.

Topic in NCERT: Viroids

Line in NCERT: "viroids: in 1971, t.o. diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease."

Test: Viroids, Prions and Lichens - Question 11
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All given statements stand true with respect to Lichens, except

Detailed Solution: Question 11

(B) The correct answer is B:  Body of lichens is made up of phycobionts only.
: Lichens are symbiotic associations i.e. mutually useful associations, between algae and fungi. The algal component is known as phycobiont and the fungal component as mycobiont, which are autotrophic and heterotrophic, respectively. Algae prepare food for fungi and fungi provide shelter and absorb mineral nutrients and water for its partner. So close is their association that if one saw a lichen in nature one would never imagine that they had two different organisms within them. Lichens are very good pollution indicators – they do not grow in polluted areas.

Topic in NCERT: Lichens

Line in NCERT: "the algal component is known as phycobiont and fungal component as mycobiont, which are autotrophic and heterotrophic, respectively."

Test: Viroids, Prions and Lichens - Question 12
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Which of the following pathogenic diseases could have symptoms like mosaic formation, leaf rolling and curling, yellowing and vein clearing, dwarfing, and stunted growth?

Detailed Solution: Question 12

. In plants diseases caused by virus include, the symptoms can be mosaic formation, leaf rolling and curling, yellowing and vein clearing, dwarfing and stunted growth.

Topic in NCERT: Viral diseases in plants

Line in NCERT: "in plants, the symptoms can be mosaic formation, leaf rolling and curling, yellowing and vein clearing, dwarfing and stunted growth."

Test: Viroids, Prions and Lichens - Question 13
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Select the correct statement -

Detailed Solution: Question 13

The correct answer is: d) Prions are similar in size than viruses.

  • Viroids are actually smaller than viruses and consist solely of a short strand of circular RNA without a protein coat. They are even simpler than viruses.
  • Prions are infectious protein particles without any nucleic acid, making them smaller and structurally simpler than viruses.
  • Lichens are symbiotic associations i.e. mutually useful associations, between algae and fungi. The algal component is known as phycobiont and fungal component as mycobiont, which are autotrophic and heterotrophic, respectively. 

Topic in NCERT: Prions 
Line in NCERT: "prions: in modern medicine certain infectious neurological diseases were found to be transmitted by an agent consisting of abnormally folded protein. the agent was similar in size to viruses."

Test: Viroids, Prions and Lichens - Question 14
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Who discovered viroids and what disease did they cause in potatoes?

Detailed Solution: Question 14

T.O. Diener discovered a new infectious agent smaller than viruses, causing the potato spindle tuber disease, identifying this agent as a viroid.

Topic in NCERT: Viroids

Line in NCERT: "in 1971, t.o. diener discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease."

Test: Viroids, Prions and Lichens - Question 15
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Viroids have:

Detailed Solution: Question 15

Viroids are the smallest infectious pathogens known. They are composed solely of a short strand of circular, single-stranded RNA that has no protein coating.

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About this NEET Practice Test

This test contains 15 MCQs on Viroids, Prions and Lichens with detailed solutions for each question. It is part of the Biology Class 11 course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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