Why is smoking cigarettes injurious to health?

  • A
    It increases the oxygen-carrying capacity of blood.
  • B
    It contains nicotine which stimulates the adrenal gland to release adrenaline and nor-adrenaline.
  • C
    It reduces the risk of lung cancer.
  • D
    It has no effect on heart rate.

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Match the following:
Column-$I$ Column-$II$
$(1)$ $AIDS$ $(A)$ Rhino Virus
$(2)$ Common Cold $(B)$ Carcinogen
$(3)$ Malaria $(C)$ Salmonella
$(4)$ Cancer $(D)$ Plasmodium
$(E)$ Retrovirus

Which one of the following options gives the correct match of a disease with its causative organism and mode of infection?

How many of the following diseases can be classified as autoimmune diseases?
Rheumatoid arthritis,Myasthenia gravis,$AIDS$,$SCID$,Vitiligo,Hashimoto's disease,Multiple sclerosis,Cancer,Type-$I$ diabetes.

Identify the plant part shown in the figure.

Pests resistant to insecticides have:

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