Home
Class 12
BIOLOGY
When a host is exposed to antigens, whic...

When a host is exposed to antigens, which may be in the form of living or dead microbes or other proteins , antibodies are produced in the host body. This type of immunity is called

A

Active immunity

B

Passive immunity

C

Auto immunity

D

Allergy

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

Which of the following is the correct option for decreases order of concentrations of different types of antibodies which are produced in our body ?

The exaggerated response of the immune system in which IgE type of antibody is called

When the immune system of host are exposed to antigen and produces antibodies it is called as:-

When performed antibodies against the antigen is infected to patient and immunity is acquired than type of immunity is :-

Read the given Statements regarding immunization and select the option that identifies the correct ones . I. The principal of vaccination is based on the memory of the immune system . II.The antibodies produced in the body against antigens neutralise the pathogenic agents before the actual infection. III. Hepatitis B vaccine is prepared by using a virus in recombination DNA technology. IV. Antibiotics are given directly in elicit a quick immune response.

The chemical substances produced by some microbes which can kill or tetrad the growth of other microbes are called

Photography is based on the nature of silver halides. Except AgF, the silver halides are photosensitive. These undergo decomposition in light and turn black due to formation of free silver. 2AgBroverset(light)to2Ag+Br_2 The photography films are prepared by adding 20% aqueous solution of AgNO_3 to NH_4Br solution containing gelatic. When such a film is exposed, emulsion gets affected and a latent image is formed on the film. When this exposed film or plate is dipped ina developer which contains a reducing agent, the part affected most during exposure are reduced to the maximum. The image becomes visible. It is called a negative. The remaining sensitive emulsion on the negative is removed by dissolving it in hypo solution (fixer). Fihnally, a positive of the nagative already prepared is made on silver bromide paper. Q. The exposed part of the film or plate after developing contains

Photography is based on the nature of silver halides. Except AgF, the silver halides are photosensitive. These undergo decomposition in light and turn black due to formation of free silver. 2AgBroverset(light)to2Ag+Br_2 The photography films are prepared by adding 20% aqueous solution of AgNO_3 to NH_4Br solution containing gelatic. When such a film is exposed, emulsion gets affected and a latent image is formed on the film. When this exposed film or plate is dipped ina developer which contains a reducing agent, the part affected most during exposure are reduced to the maximum. The image becomes visible. It is called a negative. The remaining sensitive emulsion on the negative is removed by dissolving it in hypo solution (fixer). Fihnally, a positive of the nagative already prepared is made on silver bromide paper. Q. The compound formed on the unexposed photographic film or plate is

Photography is based on the nature of silver halides. Except AgF, the silver halides are photosensitive. These undergo decomposition in light and turn black due to formation of free silver. 2AgBroverset(light)to2Ag+Br_2 The photography films are prepared by adding 20% aqueous solution of AgNO_3 to NH_4Br solution containing gelatic. When such a film is exposed, emulsion gets affected and a latent image is formed on the film. When this exposed film or plate is dipped ina developer which contains a reducing agent, the part affected most during exposure are reduced to the maximum. The image becomes visible. It is called a negative. The remaining sensitive emulsion on the negative is removed by dissolving it in hypo solution (fixer). Fihnally, a positive of the nagative already prepared is made on silver bromide paper. Q. Silver bromide dissolves in hypo solution forming:

Photography is based on the nature of silver halides. Except AgF, the silver halides are photosensitive. These undergo decomposition in light and turn black due to formation of free silver. 2AgBroverset(light)to2Ag+Br_2 The photography films are prepared by adding 20% aqueous solution of AgNO_3 to NH_4Br solution containing gelatic. When such a film is exposed, emulsion gets affected and a latent image is formed on the film. When this exposed film or plate is dipped ina developer which contains a reducing agent, the part affected most during exposure are reduced to the maximum. The image becomes visible. It is called a negative. The remaining sensitive emulsion on the negative is removed by dissolving it in hypo solution (fixer). Fihnally, a positive of the nagative already prepared is made on silver bromide paper. Q. Silver halides are used in photographgy because these compounds

ALLEN-TEST PAPER 4-BIOLOGY
  1. The antigen binding site of an antibody is present at

    Text Solution

    |

  2. Recognise the figure and find out the correct matching :

    Text Solution

    |

  3. When a host is exposed to antigens, which may be in the form of living...

    Text Solution

    |

  4. The overall ability of the host to fight the disease causing ganisms, ...

    Text Solution

    |

  5. Transplantation of tissues/organs to save certain patients often fails...

    Text Solution

    |

  6. Blood transfusion is ……….. grafting.

    Text Solution

    |

  7. Fill in the blanks: 1. The .......a....... lymphoid organs provide ...

    Text Solution

    |

  8. Natural killer cells are type of-

    Text Solution

    |

  9. MALT constitutes about percent of the lymphoid tissue in human body.

    Text Solution

    |

  10. Sometime due to genetic and other unknown reasons, the body attacks se...

    Text Solution

    |

  11. The immune system plays an important role in (a) Recognition of f...

    Text Solution

    |

  12. Read the statements and choose the correct option. (I) Secretion of ...

    Text Solution

    |

  13. Which of the following statements is correct ?

    Text Solution

    |

  14. Fill in the blanks :

    Text Solution

    |

  15. Which of the following factors affect human health ? (i) Infections ...

    Text Solution

    |

  16. concept of crop-cafeteria and crop-scheduling was given by

    Text Solution

    |

  17. Select the correct option :-

    Text Solution

    |

  18. In gene therapy to treat adenosine deaminase deficiency disorder(SCID)...

    Text Solution

    |

  19. Peyer's patches are found in

    Text Solution

    |

  20. Lipopolysaccharides of gram-negative bacteria acts as endotoxin and ha...

    Text Solution

    |