Home
Class 12
BIOLOGY
Assertion: Macrophages are multipurpose ...

Assertion: Macrophages are multipurpose cells of the body's defence mechanism.
Reason: They carry on phagocytosis, display the antigens of the engulfed microbes to the lymphocytes and secrete interleukin-I

A

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

B

If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.

C

If Assertion is true but the Reason is false.

D

If both Assertion and Reason are false.

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • HUMAN HEALTH AND DISEASE

    ICSE|Exercise COMPETITION CORNER (OBJECTIVE TYPE QUESTIONS) (Multiple Choice Questions)|68 Videos

  • EVOLUTION

    ICSE|Exercise COMPETITION CORNER (Assertion and Reason Type Questions (For AIIMS aspirants))|26 Videos

  • HUMAN REPRODUCTION

    ICSE|Exercise SOURCE BASED QUESTIONS|22 Videos

Similar Questions

Explore conceptually related problems

[A] : Macrophage is a large amoeboid cell that can engulf, ingest and destroy bacteria, damaged cells and worn-out red blood cells. This process is called phagocytosis and is an important part of the body s defence against disease. [R]: Macrophages are found free (wandering) in the tissues, in connective tissue (as histiocytes), in the lining of the blood sinusoids of the liver (as Kupffer cells), and in lymphoid tissue. They make up the reticulo-endothelial system.

Assertion: Mild fever strengthens the defence mechanism of the body. Reason: High temperature is harmful and should be brought down by giving antipyretics and by applying cold packs.

Read the following statements about WBCs and select the correct option 1) Lymphocytes are responsible for immune responses of the body 2) Basophils are least in number among white blood cells. 3) Eosinophils can engulf antigen-antibody complexes 4) Monocytes are the only phagocytic ceils of blood so that they are waited internal scavengers.

Assertion. Liver is the largest gland of the body. The hepatic lobules are the structural and functional units of liver contaning hepatic cells arranged in the form of cords. Reason. Each lobule of the liver is covered by a thin connective tissue sheath called the Glission's capsule. The bile is secreted by hepatic cells.

Assertion : Lymph is a colourless fluid containing specialised lymphocytes which are responsible for the immune responses of the body. Reason : Exchange of nutrients, gases etc., between the blood and the cells always occur through this fluid.

Assertion: DNA segments can be excised by 'molecular scissors' or 'chemical scalpels' that biotechnologists call restriction enzymes Reason: Restriction enzymes are synthesised by microbes as a defence mechanism and are specific endonucleases which can cleave double-stranded DNA.

Assertion : In a person with AB blood group, the erthrocyes carry both A and B antigenes on their surface. Reason : The allels I^(A) and I^(B) , that produe AB blood group, are codominant and both are expressed.

Given below are sets of five terms each. In each case rewrite the terms in logical sequence as directed at the end of each statement. An example has been done for you: Example: Cortical cells, Root hair, xylem, Soil water, endodermis (absorption of water by the plants) Answer : Soil water, Root hair, cortical cells, endodermis, xylem. Active immunity, Antigen, Antibody, Bacteria, Lymphocytes (defence mechanism of the body).

Each question contains STATEMENT-I(Assertion) and STATEMENT-2(Reason).Read the statement carefully and mark the correct answer according to the instruction given below: STATEMENT - 1 : If red blood cells were removed from the body and placed in pure water, pressure inside the cell increases. STATEMENT - 2 : The concentration of the salt content in the cells increases.

Which of the following are the reason(s) for Rheumatoid arthritis? Choose the correct option. (i) Lymphocytes becomes more active (ii) Body attacks self cells (iii) More antibodies are produced in the body (iv) The ability to differentiate pathogens or foreign molecules from self cells is lost

ICSE-HUMAN HEALTH AND DISEASE -COMPETITION CORNER (OBJECTIVE TYPE QUESTIONS) (Assertion and Reason Type Questions (For AIIMS aspirants))
  1. Assertion: Mild fever strengthens the defence mechanism of the body. ...

    Text Solution

    |

  2. Assertion: Interferons help eliminate viral infections. Reason: Int...

    Text Solution

    |

  3. Assertion: Macrophages are multipurpose cells of the body's defence me...

    Text Solution

    |

  4. Assertion: Alcohol is called a stimulant. Reason: Alcohol is immedia...

    Text Solution

    |

  5. Assertion: Alcoholism generally leads to fatty acid syndrome, called c...

    Text Solution

    |

  6. Assertion: Sedatives are used in sleeping pills. Reason: Sedatives c...

    Text Solution

    |

  7. Assertion: Heroin addicts have more chances of occurrence of AIDS, hep...

    Text Solution

    |

  8. Assertion: Overdose of cocaine should be avoided. Reason: Its overdo...

    Text Solution

    |

  9. Assertion: AIDS can be diagnosed immediately after HIV infection by EL...

    Text Solution

    |

  10. Assertion: HIV causes cellular immunodeficiency. Reason: HIV kills b...

    Text Solution

    |

  11. Assertion: The spread of AIDS can be prevented by lifelong monogamy an...

    Text Solution

    |

  12. Assertion: HIV infection can be avoided by use of condoms. Reason: C...

    Text Solution

    |

  13. Assertion: AIDS spreads more rapidly than hepatitis. Reason: HIV has...

    Text Solution

    |

  14. Assertion: Adenoma is sarcoma. Reason: Adenoma is located in the adi...

    Text Solution

    |

  15. Assertion: Metastatic cancers are more serious than benign tumors. R...

    Text Solution

    |

  16. Assertion: May 31 is celebrated as No Tobacco Day. Reason: On this d...

    Text Solution

    |

  17. Assertion: Frequent vaginal touches should be avoided. Reason: Lact...

    Text Solution

    |

  18. Assertion: Macrophages occur only in the connective tissue. Reason:...

    Text Solution

    |

  19. Assertion: Cancer is generally associated with a tumour. Reason: Ca...

    Text Solution

    |

  20. Assertion: Tobacco smoking is the main cause of lung cancer. Reason:...

    Text Solution

    |