Class 11 Biology Biological Classification : NCERT Solutions for Question 11
Give a brief account of viruses with respect to their structure and nature of genetic material. Also name four common viral diseases.
Viruses are sub-microscopic, infectious, nucleoprotein particles that can infect all living organisms. A virus consists of genetic material either in the form of RNA or DNA surrounded by a protein coat.
Most of the viruses, infecting plants, have single stranded RNA as genetic material. On the other hand, the viruses infecting animals have single or double stranded RNA or double stranded DNA.
Bacteriophages or viruses infecting bacteria mostly have double stranded DNA. Their protein coat called capsid is made up of capsomere subunits. These capsomeres are arranged in helical or polyhedral geometric forms.
A.I.D.S, small pox, mumps, and influenza are some common examples of viral diseases.
More Questions From Class 11 Biology - Chapter Biological Classification
- Q:- Describe briefly the four major groups of Protozoa.
- Q:- State two economically important uses of: (a) Heterotrophic bacteria (b) Archaebacteria
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- Q:- Give a comparative account of the classes of Kingdom Fungi under the following:
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(ii) Mode of reproduction - Q:- Plants are autotrophic. Can you think of some plants that are partially heterotrophic?
- Q:- What is the nature of cell-walls in diatoms?
- Q:-
How are viroids different from viruses?
- Q:- Find out what do the terms algal bloom and red-tides signify.
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- Q:-
Which of the following is not correct?
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(b) Schleiden and Schwann formulated the cell theory.
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