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Test: Viroids, Prions and Lichens - NEET MCQ


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15 Questions MCQ Test Biology Class 11 - Test: Viroids, Prions and Lichens

Test: Viroids, Prions and Lichens for NEET 2024 is part of Biology Class 11 preparation. The Test: Viroids, Prions and Lichens questions and answers have been prepared according to the NEET exam syllabus.The Test: Viroids, Prions and Lichens MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Viroids, Prions and Lichens below.
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Test: Viroids, Prions and Lichens - Question 1

What is the term used to describe infectious agents that consist of abnormally folded proteins, similar in size to viruses?

Detailed Solution for Test: Viroids, Prions and Lichens - 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.
Test: Viroids, Prions and Lichens - Question 2

Match the Column-I with Column-II

Detailed Solution for Test: Viroids, Prions and Lichens - 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

Which of the following statements is wrong for viroids?

Detailed Solution for Test: Viroids, Prions and Lichens - 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.

Test: Viroids, Prions and Lichens - Question 4

Identify the incorrect statement -

Detailed Solution for Test: Viroids, Prions and Lichens - 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.

  

Test: Viroids, Prions and Lichens - Question 5

Bacteriophage is similar to a fungus & bacterium in having :-

Detailed Solution for Test: Viroids, Prions and Lichens - Question 5

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

Test: Viroids, Prions and Lichens - Question 6

Which of the following diseases is caused by prions in cattle?

Detailed Solution for Test: Viroids, Prions and Lichens - Question 6

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

Test: Viroids, Prions and Lichens - Question 7

Lichens are symbiotic associations between which two types of organisms?

Detailed Solution for Test: Viroids, Prions and Lichens - 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.
Test: Viroids, Prions and Lichens - Question 8

Which of the following is not correctly paired ?

Detailed Solution for Test: Viroids, Prions and Lichens - 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
 

Test: Viroids, Prions and Lichens - Question 9

"Potato Spindle tuber " disease is caused by a pathogen that is:

Detailed Solution for Test: Viroids, Prions and Lichens - 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.

Test: Viroids, Prions and Lichens - Question 10

Who discovered viroids in 1971, and what disease did they find it caused?

Detailed Solution for Test: Viroids, Prions and Lichens - 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.

Test: Viroids, Prions and Lichens - Question 11

All given statements stand true with respect to Lichens, except

Detailed Solution for Test: Viroids, Prions and Lichens - 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.

Test: Viroids, Prions and Lichens - Question 12

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 for Test: Viroids, Prions and Lichens - 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.

Test: Viroids, Prions and Lichens - Question 13

Select the correct statement -

Detailed Solution for Test: Viroids, Prions and Lichens - Question 13

The correct statement is D: None of these.

- Viriods vs. Viruses: Viroids are smaller than viruses and consist of only a single short strand of RNA without a protein coat, unlike viruses.
- Prions vs. Viruses: Prions are not smaller in size than viruses but are similar in size to them 
- Lichens and Proto-cooperation: Lichens represent a symbiotic relationship between fungi and algae, showcasing mutualism rather than proto-cooperation.

Therefore, none of the statements A, B, or C are accurate.

Test: Viroids, Prions and Lichens - Question 14

Who discovered viroids and what disease did they cause in potatoes?

Detailed Solution for Test: Viroids, Prions and Lichens - 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.

Test: Viroids, Prions and Lichens - Question 15

Viroids have:

Detailed Solution for Test: Viroids, Prions and Lichens - 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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