Home
Class 12
BIOLOGY
A : if both the ovaries are removed ...

A : if both the ovaries are removed after the first trimester of pregnancy still there would be normal growth of foetus .
R : After first trimester placenta secretes sufficient progesterone

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

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Assertion (A):** The assertion states that if both ovaries are removed after the first trimester of pregnancy, there would still be normal growth of the fetus. - **Hint:** Consider the role of the ovaries in hormone production during pregnancy. 2. **Evaluating the Role of the Ovaries:** During early pregnancy, the ovaries produce hormones such as progesterone and estrogen, which are crucial for maintaining pregnancy and supporting fetal development. - **Hint:** Think about what happens to hormone levels as pregnancy progresses. 3. **Understanding the Role of the Placenta:** After the first trimester (approximately 12 weeks), the placenta takes over the production of hormones necessary for maintaining pregnancy. The placenta secretes sufficient amounts of progesterone, which is essential for the growth and development of the fetus. - **Hint:** Recall the functions of the placenta and its importance in pregnancy. 4. **Evaluating the Reason (R):** The reason states that after the first trimester, the placenta secretes sufficient progesterone. This is true and supports the assertion. - **Hint:** Consider how the body compensates for the removal of the ovaries during pregnancy. 5. **Conclusion:** Since both the assertion and the reason are true, and the reason correctly explains the assertion, we can conclude that the statement is justified. - **Hint:** Reflect on the relationship between the assertion and the reason to determine their validity. **Final Answer:** Both the assertion (A) and the reason (R) are true, and R explains A. Thus, the answer is that the statement is correct. ---
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

If both ovaris are removed from pregnant human femle in first trimester of pregnacy then it will lead to

Read the given statements and select the correct option Statement 1 : MTP is considered relatively safe during the first frimester of pregnancy Statement 2 : Foetus becomes intimately associated with the materanal tissues after the first trimester.

Which of the following condition arises in subsequent pregnancies after the first normal pregnancy ?

Which hormone maintains progesterone and estrogen secretion by the corpus luteum through the first trimester of pregnancy ?

From a to d which of the following statements are correct ? (a) Fertilisation can occur only if the ovum and sperm are transported simultaneously to the ampullary isthmic junction (b) First movement of foetus and appearance of hair on head are usually observed during the fifth month of pregnancy . (c) On 14^(th) day of Menstrual cycle , the level of progesterone is maximum . (d) The signals for parturition originate from fully developed foetus and placenta

In the following items, cach passage consists of six sentences. The first sentence (S_1) and the final scntence (S_6) are given in the beginning. The middle four sentences in each have been removed and jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark accordingly on the Answer Sheet. S_1 : Until the hospital could be built there was no surgery available for the patients. S_6 : After a short time an emergency hospital was created from a rough fowl-house. P: But there were disadvantages. Q : Schweitzer therefore started his medical treatment in an open space outside his house. R: Moreover, there was a storm almost every evening, when everything had to be dragged hurriedly to the shelter of the verandah. S: Working in the sun was very tiring. The proper sequence should be

In the following items, each passage consists of six sentences. The first and the sixth sentence are given in the beginning as S 1 and S 6 . The middle four sentences in each have been removed and jumbled up. These are labelled P, Q, R and S. You are required to find out the proper sequence of the four sentences and mark accordingly on the Answer Sheet. S_(1) : So we went on in the quiet, and the twilight deepened into night. S_(6) Then as the darkness grew deeper, she put her arms round my neck, and, closing her eyes tightly pressed. her face against my shoulder. P : The ground grew dim and the trees black. Q : The clear blue ,of the distance faded, and one star after another came out. R : Neena's fears and her fatigue grew upon her. S : I took her in my arms and talked to her and caressed her. The proper sequence should be

Each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and give answer 1) if the data in statement I alone are sufficient to answer the question while the data in statement II alone are not sufficient to answer the question. 2) if the data in statement II alone are sufficient to answer the question while the data in statement I alone are not sufficient to answer the question. 3) if the data either in statement I alone or in statement II alone are sufficient to answer the question. 4) if the data even in both statements I and II together are not sufficient to answer the question. 5) if the data in both statements I and II together are necessary to answer the question. Who reached station first among P, Q, R, S, T and V? I. Q reached before R but not before S, who reached after V but before P. II. T reached after V and Q. P reached after S, who did not reach after Q.

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 frog gray cresent is formed during fertilization R : I...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  18. A : Developments is the emergence of a multicellular organism f...

    Text Solution

    |

  19. A : Synthesis of milk is stimulated by rise in the level of ox...

    Text Solution

    |

  20. A : Blastocyst undergoes gastrulation to produce the three germinal...

    Text Solution

    |