Home
Class 12
BIOLOGY
A : in morula stage the cells divide w...

A : in morula stage the cells divide without any increase in size
R : zona pellucida remains intact till cleavage is completed

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion then mark (2)

C

If Assertion is true statement but Reason is false then mark (3)

D

If both Assertion and Reason are false statement then Mark (4)

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • HUMAN REPRODUCTION

    AAKASH INSTITUTE|Exercise Try Yourself|17 Videos
  • HUMAN REPRODUCTION

    AAKASH INSTITUTE|Exercise Assignment ( Section - C ) (Previous Type Question )|81 Videos
  • EXCRETORY PRODUCTS AND THEIR ELIMINATION

    AAKASH INSTITUTE|Exercise SECTION D ( ASSERTIN-REASON TYPE QUASTION)|10 Videos
  • LOCOMOTION AND MOVEMENT

    AAKASH INSTITUTE|Exercise ASSIGNMENT SECTION-D|10 Videos

Similar Questions

Explore conceptually related problems

Statement-1: Upto morula stage, the cells divide without any increase in size. Statement-2: Zona perllucida remains intact till cleavage is complete.

As the cells cease to divide, they increase in size.

At fully turgid stage the cell wall prevents the protoplast from increasing in size and exerts a pressure called

Read the following statements and find out the INCORRECT statement. a. Plant growth is unique because plants retain the capacity for unlimited growth throughout their life. b. Growth, at a cellular level , is principally a consequence of the increase in the amount of protoplasm. c. One single maize root apical meristem can give rise to more than 3,50,00 new cells per hour , whereas cells in watermelon may increase in size by up to 17, 500 times. d. Environmental signals such as light , temperature and gravity also affect certain phases or stages of growth. e. In geometric growth, following mitotic cell division , only one daughter cell continues to divide while the other differentiates adn matures.

A wedge of mass m and triangular cross- section (AB = BC = CA = 2R) is moving with a constant velocity -v hat I towards a sphere of radius R fixed on a smooth horizontal table as shown in figure. The wadge makes an elastic collision with the fixed sphere and returns along the same path without any rotaion. Neglect all friction and suppose that the wedge remains in contact with the sphere for a very shot time. Deltat, during which the sphere exerts a constant force F on the wedge. (a) Find the force F and also the normal force N exerted by the table on the wedge during the time Deltat. (b) Ler h denote the perpendicular distance between the centre of mass of the wedge and the line of action of F. Find the magnitude of the torque due to the normal force N about the centre of the wedge, during the interval Deltat.

Given graphs P,Q,R and S show four stages of cell cycle i.e., G_(1) ,S, G_(2) and M, but in random order. Identify the stages and match with the activites of the cell. I. Taxl ol treatment, which prevent microtubule depolymerization, arrests the cell at this tage . II. With a mitogen treatment , such as an epidemal growth factor, an arrested cell at this stage proceeds to the next stage of the cell cycle. III. The cell cycle check point at this stage confirms. that DNA duplication is complete before the cell proceeds to the next stage

A person has to completely put each of three liquids: 403 litres of petrol, 465 litres of diesel and 496 litres of Mobil Oil in bottles of equal size without mixing any of the above three types of liquids such that each bottle is completely filled. What is the least possible number of bottles required? (a) 34 (b) 44 (c) 46 (d) None of these

AAKASH INSTITUTE-HUMAN REPRODUCTION-Assignment ( Section - D ) (Assertion - Reason Type Question ) (In the following question a statement of assertion (A) is followed by a statement of reason (R )
  1. A : In human ovum is alecithal type. R : is is almost free of y...

    Text Solution

    |

  2. A : Oxytocin acts on the uterine muscles and cause stronger uter...

    Text Solution

    |

  3. A : in morula stage the cells divide without any increase in siz...

    Text Solution

    |

  4. A : In frog gray cresent is formed during fertilization R : I...

    Text Solution

    |

  5. A : If fertilization occurs the corpus luteum is rescued from r...

    Text Solution

    |

  6. A : if both the ovaries are removed after the first trimester o...

    Text Solution

    |

  7. A : placenta is connected to the embryo through an umbilical cor...

    Text Solution

    |

  8. A : All copulations do not lead to fertilisation and pregnancy ....

    Text Solution

    |

  9. A : Lack of menstruation may be indicative of pregnancy R : ...

    Text Solution

    |

  10. A : LH acts on Sertolic cells for release of certain factors re...

    Text Solution

    |

  11. A : The first sign of growing foetus may be noticed by listeni...

    Text Solution

    |

  12. A: Leyding 's cells synthesise and secrete festicular hormones ca...

    Text Solution

    |

  13. A : In spermatogenesis the first haploid forms are spermatids. R...

    Text Solution

    |

  14. A : Presence or absence of hymen is not a reliable inducator of v...

    Text Solution

    |

  15. A : After menopause the levels of blood gonadotropins will rise ...

    Text Solution

    |

  16. A : The secretions of male accessory glands constitute the semi...

    Text Solution

    |

  17. A : Corpus luteum begins to atrophy after a short life of 10 to ...

    Text Solution

    |

  18. A : Most birds posses only the left ovary and left oviduct for...

    Text Solution

    |

  19. A : The most immediate effect of FSH is the maturation of exis...

    Text Solution

    |

  20. A : The morula passes through the phase of compaction produces ...

    Text Solution

    |