CBSE Class 11 Biological Classification Worksheet A

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ASSERTION REASON QUESTIONS

Directions : These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following five responses.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(e) If the Assertion is incorrect but the Reason is correct.

Question. Assertion: Viruses are not considered organism.
Reason: Viruses are nucleoproteins and lack cell organelle, etc. 
Answer. A

Question. Assertion : Bacteria have three basic shapes, i.e., round , rod, spiral.
Reason : Cocci and Bacilli may form clusters or chain of a definite length. 
Answer. E

Question. Assertion : Aflatoxins are produced by Aspergillus flavus.
Reason : These toxins are useful to mankind.
Answer. C

Question. Assertion : Escherichia coli, Shigella sp. and Salmonella sp. are all responsible for diarrhoeal diseases. 
Reason : Dehydration is common to all types of diarrhoeal diseases and adequate supply of fluids and electrolytes should be ensured.
Answer. B

Question. Assertion : Gram-negative bacteria do not retain the stain when washed with alcohol.
Reason : The outer face of the outer membrane of gram-negative bacteria contains lipopolysaccharides, a part of which is integrated into the membrane lipids. 
Answer. A

Question. Assertion : Neurospora is commonly called water mould.
Reason : It belongs to basidomycetes fungi.
Answer. D

Directions : Each of these questions
contains an Assertion followed by Reason. Read them carefully and answer the question on the basis of following options. You have to select the one that best describes the two statements.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

Question. Assertion : Chemosynthesis is an autotrophic nutrition.
Reason : Chemoautotrophs contain chlorophyll pigments. 
Answer. B

Question. Assertion : TMV is a virus which causes mosaic disease.
Reason : TMV has RNA as genetic material
Answer. B

1. Who introduced the five kingdom classification of organisms?
2. To which kingdom the multicellular decomposers belong?
3. Expand PPLO.
4. What is the basis of modern classification?
5. Give one example of a fungus as a soure of antibiotics?
6. How are viroids different from viruses?
7. Explain sexual reproduction in bacteria?
8. Discuss the salient features of viruses with the help of diagram? 
9. Write the distinct characters of fungi & explain using a diagram.

Click on link below to download CBSE Class 11 Biological Classification Worksheet A.