Home
Class 12
BIOLOGY
Assertion : In biospy test for cancer, ...

Assertion : In biospy test for cancer, piece of the suspected tissue cut into thin sections is stained and examined under X -ray by a pathologist.
Reason : Use of X-ray is able to generate a 3-D image of the section of affected tissue.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false

D

If both assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • HUMAN HEALTH AND DISEASE

    MOTION|Exercise Exercise - 3|70 Videos

  • EXCRETORY PRODUCTS AND THEIR ELIMINATION

    MOTION|Exercise EXERCISE - 4 AIIMS - Assertion & Reason Questions|29 Videos

  • HUMAN REPRODUCTION

    MOTION|Exercise EXERCISE - 4 AIIMS - ASSERTION & REASON QUESTIONS (AIIMS - 2015)|40 Videos

Similar Questions

Explore conceptually related problems

Read the following statements regarding the various techniques used in cancer detection. (i) Cancer detection is based on biopsy and histopathological studies of the tissue, and blood and bone marrow tests for increased cell counts in case of leukaemia. (ii) In biopsy, a piece of the suspected tissue cut into thin sections is stained and examined under microscope by a pathologist. (iii) Techniques like radiography (use of X-rays), CT (computed tomography) and MRI(magnetic resonacne imaging) are very useful to detect cancers of the internal organs. (iv) Computed tomography uses strong magnetic fileds and non-ionising radiations to detect physiological changes in living tissues. (v) MRI uses X-rays and ionising radiation to generate a 3-D image of the internal structure of an object. Which of the above statements are incorrect ?

fill in the blanks : (i) in …..a…..a priece of the suspected tissue cut into thin sections is stained and examined under microscope (…..b…..) by a pathologist . (ii) In radiography ….c…. Are used (iii) In CT scan ….d…..are used.

Read the passage given below and answer the following questions: Reduction of carboxylic acids and their derivatives plays an important role in organic synthesis, in both laboratory and industrial processes. Traditionally, the reduction is performed using stochiometric amounts of hydride reagents, generating stochiometric amounts of waste. A much more attractive, atom-economical approach is a catalytic reaction using H_2 , however, hydrogenation of carboxylic acid derivatives under mild conditions is a very challenging task, with amides presenting the highest challenge among all classes of carbonyl compounds. Very few examples of the important hydrogenation of amides to amines, in which the C-O bond is cleaved with the liberation of water (Scheme 1), were reported. C-O cleavage of amides can also be affected with silanes as reducing agents. We have now prepared the new, dearomatized, bipyridine-based pincer complex 3, catalyst 3(Here refered as Cat. 3). Remarkably, it efficiently catalyzes the selective hydrogenation of amides to form amines and alcohols (eq 1). The reaction proceeds under mild pressure and neutral conditions, with no additives being required. Since the reaction proceeds well under anhydrous conditions, hydrolytic cleavage of the amide is not involved in this process. (Balaraman, E., Gnanaprakasam, B., Shimon, L. J., & Milstein, D. (2010). Direct hydrogenation of amides to alcohols and amines under mild conditions. Journal of the American Chemical Society, 132(47), 16756-16758.) In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage. Assertion: N-methyl ethanamide on reaction with catalyst 3 will yield ethanol and methanamine. Reason: Use of Catalyst 3 brings about cleavage of C-N bond of amides

Read the passage given below and answer the following questions: Reduction of carboxylic acids and their derivatives plays an important role in organic synthesis, in both laboratory and industrial processes. Traditionally, the reduction is performed using stochiometric amounts of hydride reagents, generating stochiometric amounts of waste. A much more attractive, atom-economical approach is a catalytic reaction using H_2 , however, hydrogenation of carboxylic acid derivatives under mild conditions is a very challenging task, with amides presenting the highest challenge among all classes of carbonyl compounds. Very few examples of the important hydrogenation of amides to amines, in which the C-O bond is cleaved with the liberation of water (Scheme 1), were reported. C-O cleavage of amides can also be affected with silanes as reducing agents. We have now prepared the new, dearomatized, bipyridine-based pincer complex 3, catalyst 3(Here refered as Cat. 3). Remarkably, it efficiently catalyzes the selective hydrogenation of amides to form amines and alcohols (eq 1). The reaction proceeds under mild pressure and neutral conditions, with no additives being required. Since the reaction proceeds well under anhydrous conditions, hydrolytic cleavage of the amide is not involved in this process. (Balaraman, E., Gnanaprakasam, B., Shimon, L. J., & Milstein, D. (2010). Direct hydrogenation of amides to alcohols and amines under mild conditions. Journal of the American Chemical Society, 132(47), 16756-16758.) In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage. Assertion: Use of hydride catalyst or hydrogen brings about cleavage of C-O bond in amides. Reason: Hydride catalyst or hydrogen cause to reduction of amides.

Read the passage given below and answer the following questions: Reduction of carboxylic acids and their derivatives plays an important role in organic synthesis, in both laboratory and industrial processes. Traditionally, the reduction is performed using stochiometric amounts of hydride reagents, generating stochiometric amounts of waste. A much more attractive, atom-economical approach is a catalytic reaction using H_2 , however, hydrogenation of carboxylic acid derivatives under mild conditions is a very challenging task, with amides presenting the highest challenge among all classes of carbonyl compounds. Very few examples of the important hydrogenation of amides to amines, in which the C-O bond is cleaved with the liberation of water (Scheme 1), were reported. C-O cleavage of amides can also be affected with silanes as reducing agents. We have now prepared the new, dearomatized, bipyridine-based pincer complex 3, catalyst 3(Here refered as Cat. 3). Remarkably, it efficiently catalyzes the selective hydrogenation of amides to form amines and alcohols (eq 1). The reaction proceeds under mild pressure and neutral conditions, with no additives being required. Since the reaction proceeds well under anhydrous conditions, hydrolytic cleavage of the amide is not involved in this process. (Balaraman, E., Gnanaprakasam, B., Shimon, L. J., & Milstein, D. (2010). Direct hydrogenation of amides to alcohols and amines under mild conditions. Journal of the American Chemical Society, 132(47), 16756-16758.) In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage. Assertion: The use of catalyst 3 is an efficient method of preparation of primary amines Reason: Use of catalyst 3 is a step down reaction.

MOTION-HUMAN HEALTH AND DISEASE-Exercise - 4
  1. Which of the following is correct?

    Text Solution

    |

  2. Assertion : In servere cases of Pneumonia, the lips and finger nalls m...

    Text Solution

    |

  3. Assertion : In biospy test for cancer, piece of the suspected tissue ...

    Text Solution

    |

  4. Assertion : Withdrawl of drug is charcterised by anixety, sickness, na...

    Text Solution

    |

  5. Assertion : alpha- interferon is given to cancer patient which helps i...

    Text Solution

    |

  6. Assertion : Principle of vaccination is based on the property of 'memo...

    Text Solution

    |

  7. Assertion . Mast cells in human body release excessive amount of infla...

    Text Solution

    |

  8. Assertion : Natural Killer cells are found in blood. Reson : These a...

    Text Solution

    |

  9. Assertion (A) : Dope test is used to estimate the lavel of blood alcoh...

    Text Solution

    |

  10. Assertion : Interferons are a type of antibodies produced by body cell...

    Text Solution

    |

  11. Assertion (A): Organ transplantation patients are given immunosuppress...

    Text Solution

    |

  12. Assertion (A): A person who has received a cut and is bleeding needs t...

    Text Solution

    |

  13. Assertion (A) : Cancer cells are virtually immortal until the body in...

    Text Solution

    |

  14. Assertion : Escherichia coli, Shigella sp. And salmonella sp. Are all ...

    Text Solution

    |

  15. Assertion : LSD and marijuana are clinically used as analgesics. Rea...

    Text Solution

    |

  16. Assertion : Emphysema is caused by cigarette smoking Reason : Cigara...

    Text Solution

    |

  17. Assertion : Sporozoites of malarial parasite enter in the human body d...

    Text Solution

    |

  18. Assertion : ECG is a graphical representation of the electrical activi...

    Text Solution

    |

  19. Assertion : Smoking makes oxgyen less available to the body Reason :...

    Text Solution

    |

  20. Assertion : The 'T-wave' represent return of the ventricle form excite...

    Text Solution

    |