The disease caused by the bacterium Salmonella typhi is:
A. Tuberculosis
B. Typhoid
C. Cholera
D. Dysentery
Answer: Option B
Solution (By JKExamLibrary)
Typhoid fever is caused by Salmonella typhi, transmitted via contaminated food/water, causing high fever, abdominal pain, and rose spots. Widal test is used for diagnosis. Cholera is Vibrio cholerae, TB Mycobacterium, dysentery Shigella or Entamoeba.
Explanation:
Dendrites are branched extensions of the neuron cell body that receive synaptic inputs from other neurons and transmit graded potentials towards the soma. The axon conducts action potentials away from the soma to the terminals, which then synapse with other cells. Dendrites have receptor sites for neurotransmitters.
Consider the following statements about enzymes:
1. They are biological catalysts.
2. They are consumed in the reaction.
3. They lower the activation energy of reactions.
Which of the above is/are correct?
Explanation:
Enzymes speed up reactions by lowering activation energy and are not consumed; they remain unchanged after the reaction. Thus, statement 2 is false. 1 and 3 are correct.
Explanation:
Carrot and radish are examples of modified taproots where the primary root swells to store food. Prop roots are adventitious (banyan), fibrous roots are fine and branching (grasses), adventitious arise from stems/leaves.
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