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MCQ Tutorial - General Knowledge->Biology

                        
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66.) Number of chromosomes in Down's syndrome is
Options are:
A.) 48
B.) 46
C.) 47
D.) 49
67.) Plants are killed in winter by frost
Options are:
A.) Because there is no transpiration
B.) Because no photosynthesis takes place at such low temperature
C.) Because respiration ceases at such low temperature
D.) Because of desiccation and mechanical damage to the tissues
68.) Mycobacterium leprae causes leprosy, Corynebacterium diphtheria causes diphtheria and Vibrio comma
causes

Options are:
A.) Influenza
B.) Cholera
C.) Typhoid
D.) Tetanus
                        
69.) Oxyreductases, transferases, hydrolases, lyases, isomerases and ligases are all classes of
Options are:
A.) Enzymes
B.) Proteins
C.) Hormones
D.) Vitamins
70.) Mutation is 
Options are:
A.) A factor responsible for plant growth
B.) A change which affects the offspring of F2 generation only
C.) A change that is inherited
D.) A change which affects the parents
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