Home
Class 12
BIOLOGY
[A]: Ear muscles of external ear in man ...

[A]: Ear muscles of external ear in man are well developed.
[R]: These muscles do not move external ear freely to detect sound

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • Fungi

    TRUEMAN BIOLOGY|Exercise ASSERTION AND REASON|28 Videos
  • GENETICS AND EVOLUTION

    TRUEMAN BIOLOGY|Exercise SECTION-D|25 Videos

Similar Questions

Explore conceptually related problems

Supportive skeletal structures in the human external ears and nose tip are of

[A] : Tympanic membrane stretching across the aperture between skull bones or within an external meatus. [B]: This vibrates periodically and transmit- ting external air pressure changes to ear os- sicles of middle ear.

Go through the following statements During muscle contraction, the width of A-band remains constant while I-band shortens. During muscle contraction, the Ca^(2+) released from the SR bind to the troponin component of thin filament The process of muscle contraction is faster in smooth muscle as they have a well developed sarcoplasmic reticulum. The red muscle fibres have abundant mitochondria, low glycogen and poorly formed sarcoplasmic reticulum.

[A]: Pinna of ear is quite elastic and pliable. [R]: Pinna Qf ear is made up of spongy bone.

[A] : All body cells continuously obtain useful material from, and dispose of their waste products into the external fluid medium. This is mainly maintained as a constancy and is termed excretion. [R]: This is achieved by constant disposal or excretion of all waste products and refuse, as well as, useless materials from body into external environments.

The figure shows the connections of a rheostat with an external battery. A is an ammeter and V is a voltmeter. The sliding contact R starts from point P and moves towards the end Q. The correct statement is

Eye detects the green light (lambda = 5000 overset@A), 5 xx 10^4 photons per square metre per second and the ear can detect 10^-13 watt per square metre. In form of power detector, the eye is sensitive in comparison to the ear by

Answer the following : (a) Which part of the ear determines the pitch of a sound ? (b) Which part of the human brain is the most developed ? (c ) Which part of our central neural system acts as a master clock ?

[A] : Our inner ear contains sense organs for balance movement of fluid over hair cells in the semicircular canals and gives us a sense of dynamic equilibrium. [R]: Inner ear contains Ca003 granules (otoliths) resting on hair cells. The movement of these granules gives us a sense of static equilibrium.

A snake has no ear but it perceives sound through

TRUEMAN BIOLOGY-Genetics-ASSERTION AND REASON
  1. [A]: Vestigeal organs are those parts of the body which are greatly re...

    Text Solution

    |

  2. [A]: Homology is the similarity between or- gans of same animal based ...

    Text Solution

    |

  3. [A]: Ear muscles of external ear in man are well developed. [R]:...

    Text Solution

    |

  4. [A]: Convergent evolution leads to production of analogous similaritie...

    Text Solution

    |

  5. [A]: Heritable changes are also called mutations. [R]: Mutations ...

    Text Solution

    |

  6. [A]: Homologous organs have similar structure but different functions....

    Text Solution

    |

  7. [A]: In large groups of animals and plants, there are identical enzyme...

    Text Solution

    |

  8. [A]: During evolution of Primates, various groups diverged in a partic...

    Text Solution

    |

  9. [A]: Macro evolution produces groups of parallel special adaptations a...

    Text Solution

    |

  10. [A] : Organisms that bear large number of common amino acid sequence m...

    Text Solution

    |

  11. [A]: Homologous organs have similar structure but different functions....

    Text Solution

    |

  12. Assertion:Analogous organs serve the same function and look alike, but...

    Text Solution

    |

  13. Assertion:Frog's tadpole has fish-like form, tail and gills Reason: ...

    Text Solution

    |

  14. Assertion:Jurassic period is considered as the age of reptiles. Reas...

    Text Solution

    |

  15. [A]: Some babies have a small tail. [R]: This is just a freak of ...

    Text Solution

    |

  16. [A]: The first life orginated was chemo-het- erotrophic. [R]: The...

    Text Solution

    |

  17. [A]: Evolution is a theory. [R]: As it is based on causes and evi...

    Text Solution

    |

  18. [A]: Cabbage, cauliflower, Kohlrabi, Broccoli and Brussels have descen...

    Text Solution

    |

  19. [A]: Evolution is not occurring at present. [R]: Evolution is a v...

    Text Solution

    |

  20. [A]: According to the theory of Lamarck use and disue caused the incre...

    Text Solution

    |