In the following questions, a statement of Assertion (A) is followed by a statement ofReason (R).(1) If both Assertion and Reason are true and the reason is the correct explanation of the assertion, then mark (a) (2) If both Assertion and Reason are true but the reason is not the correct explanation of the assertion, then mark (b) (3) If Assertion is true but Reason are false, then mark (c) (4) Ifboth Assertion and Reason are false, then mark (d) Assertion: In Griffith’s experiment mice were injected by a mixture of heat killed Smooth type bacteria and live Rough type bacteria. Some mice died of pneumonia and their blood contained both live Rough type bacteria and live Smooth type bacteria.
Answers
ANSWER :
D) Both Assertion and Reason are incorrect.
EXPLANATION :
when bacteria streptococcus pneumoniae are grown on a culture plate, some produce smooth shiny colonies (s) while others produce rough colonies (r). this is because the s strain bacteria have a mucous (polysaccharide) coat, while r strain does not. mice infected with the s strain (virulent) die from pneumonia infection but mice infected with the r strain do not develop pneumonia. in griffiths experiment, some transforming principle, transferred from the heat-killed s strain, had enabled the r strain to synthesize a smooth polysaccharide coat and become virulent which must be due to the transfer of the genetic material. this is known as transformation.
when bacteria streptococcus pneumoniae are grown on a culture plate, some produce smooth shiny colonies (s) while others produce rough colonies (r). this is because the s strain bacteria have a mucous (polysaccharide) coat, while r strain does not. mice infected with the s strain (virulent) die from pneumonia infection but mice infected with the r strain do not develop pneumonia. in griffiths experiment, some transforming principle, transferred from the heat-killed s strain, had enabled the r strain to synthesize a smooth polysaccharide coat and become virulent which must be due to the transfer of the genetic material. this is known as transformation.so, the correct answer is 'both assertion and reason are incorrect'.
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