Download App

Human Health and Disease — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Health and Disease1 Mark
MCQ
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Immunity means all capacity of human body to resist almost all types of organisms or toxins that tend to damage the tissues and organs.
Reason: Spleen is the only organ involved in immunity.
  • A
    Both assertion and reason are true, and reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true, but reason is not the correct explanation of assertion.
  • ✓
    Assertion is true, but reason is false.
  • D
    Both assertion and reason are false.
✓

Answer

Correct option: C.
Assertion is true, but reason is false.
The principal parts of the immune system are the bone marrow, thymus, lymphatic system, tonsils, and spleen. The lymph nodes, tonsils, and spleen act to trap and destroy antigens from the lymph, air, and blood, respectively.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion (A) & Reason (B) MCQ" from Human Health and Disease→Human Health and Disease — all question types→BIOLOGY STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : The principle of segregation given by Mendel is the principle of purity of gametes.
Reason : Gametes are pure for a character.
→
Assertion (A): Evolution of man is the example of progressive evolution.
Reason (R): Tapeworm is developed due to retrogressive evolution.
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Quantitative inheritance is called polygenic inheritance.
Reason: Several genes control the expression of a trait.
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Some diseases that attack in childhood do not attack again.
Reason: Memory cells plays an important role.
→
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Maximum biodiversity occurs in temperate areas.
Reason: Temperate areas have favourable conditions for speciation and for supporting variety and number of organisms.
→
Assertion (A): Griseofulvin extracted from P. griseofulvum is used for ringworm treatment.
Reason (R): Trichophyton, Epidermophyton, etc. cannot grow well in presence of Penicillium griseofulvum.
→
Two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Restriction enzymes cut the strand of $\text{DNA}$ to produce sticky ends or blunt ends.
Reason: Stickiness of the ends facilitates the action of the enzyme $\text{DNA}$ polymerase.
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Each seminiferous tubule is lined on its inside by three types of cells.
Reason: These cells are male germ cells, Sertoli cells and Leydig's cells.
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Megaspore mother cell undergoes meiotic division.
Reason: All four megaspores form female gametophyte.
→
Assertion (A): Large holes in Swiss cheese are due to the production of a large amount of carbon dioxide by specific microbe.
Reason (R): The specificity of characteristic texture, flavour and taste of Swiss cheese is due to the use of bacterium Propionibacterium shermanii.
→