Home
Class 12
BIOLOGY
Natural breaking of seed dormancy occurs...

Natural breaking of seed dormancy occurs through
I leaching of inhibitors and salts
II attainment of maturity during dormant period by immature embryo
III formation of growth hormones
IV rupturing of seed coat by chilling, chopping, machine threshing
Choose the correct option

A

I,II and III

B

I and III

C

only III

D

only IV

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • MORPHOLOGY OF FLOWERING PLANTS

    ARIHANT NEET|Exercise Chapter exercises C( Medical entrances gallery ( collection of questions Asked in NEET & Various Medical Entrance Exams ))|140 Videos

  • MORPHOLOGY OF FLOWERING PLANTS

    ARIHANT NEET|Exercise Chapter exercises A (Taking it together (Assorted Questions of the Chapter for Advanced Level Practice))|274 Videos

  • MONERA

    ARIHANT NEET|Exercise Chapter exercises Medical entrances gallery (Collection of questions asked in NEET & various medical entrance exams)|47 Videos

  • MOVEMENT AND LOCOMOTION

    ARIHANT NEET|Exercise Medical entrances gallary ( Collection of question asked in NEET & various Medical Entrance Exam )|54 Videos

Similar Questions

Explore conceptually related problems

Anemochory or wind dispersal of seeds is found in I Acer II Calotropis III Xanthium IV Medicago Choose the correct option

Causes of seed dormancy are I impermeability of seed coats II immature embryos III viable seeds IV maturity of embryos Choose the correct option

Select the correct order of events occuring in blood clotting :- (I) Formation of fibrin polymer. (II) Formation of clot. (III) Thromboplastin formation. (IV) Conversion of prothrombin to thrombin. Choose the correct option :-

Abscisic acid I. induces dormancy II. Induce cell elongation III. Provides defence against salt and cold stresses IV. Inhibits abscission Choose the correct option.

What is true abourt mammals? I. Skin is covered by epidermal hair. II. Evolved during Triassic period of Coenozic era. III. Kidneys are metanephric. IV. Fertilisation is external. Choose the correct option.

The electronic displacements in covalent bonds may occur either in the ground state under the influence of an atom or a substituent group or in presence of an appropriate attacking reagent. As a result of these electron displacements, centres of different electron densities are created and these centres are susceptible to attack by the reagents. These electron displacements occur through inductive electromeric, resonance and hyperconjugation effects. Whereas inductive effect involves displacement of sigam -electrons towards the substituent, resonance effect involves delocalization of pi- electrons transmitted through the chain and both are permanent effect. Electromeric effect is the complete transfer of a shared pair of pi - electrons to one of the atoms joined by a multiple bond on the demand of an attacking reagent. Hyperconjugation effects on the other hand involve delocalization of sigma -electrons of C-H bond of an alkyl group directly attached to an atom of unsaturated system (i.e., sigma-pi -conjugation). Both inductive and hyperconjugation effects can be used to explain the stability of carbocations and free radicals which follow the stability order : 3^(@)gt2^(@)gt1^(@) . The stability or carbanions, however, follows the reverse order. An organic reaction occurs through making and breaking of bonds. The breaking of a covalent bond may occur either homolytic leading to the formation of free radicals or heterolytic forming positively (carbocations) or negatively (carbanions) charged species. Most of the attacking reagents carry either a positive or a negative charge. The positively charged species with electron deficient centre or neutral species (free radicals, carbenes, nitrene) are collectively called electrophiles, while negatively charged species with electron rich centre or neutral species (like water, alcohol, ammonia, etc.) are called nucleophiles. Consider the following alkenes and what is correct decreasing order of stability? {:(underset("(I)")underset("But-1-ene")(CH_(3)CH_(2)CH=CH_(2))", "underset("(II)")underset("2,3-Dimethylbut-2-ene")((CH_(3))_(2)C=(CH_(3))_(2))","),(underset("(III)")underset("2-Methylbut-2-ene")((CH_(3))_(2)C=CHCH_(3))", "underset("(IV)")underset("2-Methylpropene")((CH_(3))_(2)C=CH_(3))):}

What is/are the function (s) of oxytocin hormone? I. Ejection of milk from mammary glands. II.Contraction of uterus during child birth. III. Maintenance of corpus luteum. IV. Stimulates reproductive system. Choose the correct option.

Which of the following is / are correct ? I in dry fruits the pericarp is dry and is not differentiated into epicarp mesocarp and endocarp II in succulent fruits the pericarp is fleshy and is differentiated into epicarp mesocarp and endocarp III capsular fruits are those simple dry multi seeded after ripening and seeds are exposed IV achenial fruits are multiseeded dehiscent in which pericarp ruptures and seeds remain inside Choose the correct option

ARIHANT NEET-MORPHOLOGY OF FLOWERING PLANTS -Chapter exercises B ( Medical entrance special format questions )
  1. The exaples of dictyledonous seeds are cicer II brassica III lyc...

    Text Solution

    |

  2. Causes of seed dormancy are I impermeability of seed coats II imma...

    Text Solution

    |

  3. Natural breaking of seed dormancy occurs through I leaching of inhib...

    Text Solution

    |

  4. Anemochory or wind dispersal of seeds is found in I Acer II Calotr...

    Text Solution

    |

  5. Read the given statements I fruits such as clematis have hard hair a...

    Text Solution

    |

  6. Consider the given statement regarding roots and choose the option hav...

    Text Solution

    |

  7. Identify the correct order 1. Mineral absorption zone. 2. Meristem...

    Text Solution

    |

  8. Read the statement given below I excurrent is stem showing jointed ...

    Text Solution

    |

  9. Consider the statement given below and choose the option reperseing al...

    Text Solution

    |

  10. Read the statement(s) given below and identify the incorrect statement...

    Text Solution

    |

  11. A flower repersent the reproductive unit of a plant read the folloiwng...

    Text Solution

    |

  12. The following statements given below are in context of simple fruits r...

    Text Solution

    |

  13. Read the following statement regarding fruit or seed dispersal that de...

    Text Solution

    |

  14. Read the following statement with respect to economic importance of va...

    Text Solution

    |

  15. Match the following columns

    Text Solution

    |

  16. Match the following columns

    Text Solution

    |

  17. Match the following columns

    Text Solution

    |

  18. Match the following columns

    Text Solution

    |

  19. Match the following columns

    Text Solution

    |

  20. Match the following columns

    Text Solution

    |