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Tamil Nadu Board of Secondary EducationHSC Science Class 12

Answer the following type of question Assertion (A) and Reason (R) (A) - Ovulation is the release of ovum from the Graafian follicle. - Zoology

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Question

Answer the following type of question Assertion (A) and Reason (R).

(A) - Ovulation is the release of the ovum from the Graafian follicle.

(R) - It occurs during the follicular phase of the menstrual cycle.

Options

  • A and R are true, R is the correct explanation of A.

  • A and R are true, R is not the correct explanation of A.

  • A is true, R is false.

  • Both A and R are false.

MCQ

Solution

A is true, R is false.

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Chapter 2: Human Reproduction - Evaluation [Page 29]

APPEARS IN

Samacheer Kalvi Biology (Zoology) [English] Class 12 TN Board
Chapter 2 Human Reproduction
Evaluation | Q 17. | Page 29
Samacheer Kalvi Biology (Zoology) [English] Class 12 TN Board
Chapter 2 Human Reproduction
Evaluation | Q 15. | Page 28

RELATED QUESTIONS

Differentiate between the following pair: 

Menarche and menopause 


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Painful menstruation is termed as ____________.


Explain the various phases of the menstrual cycle.


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In the absence of fertilization, corpus luteum ____________.


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When does the following step take place?


To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.

 

The peak observed in Subject 1 and 2 is due to ______ 


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  HORMONE A HORMONE B
Subject 1 Shows a peak on the 14th Day of the menstrual cycle. Falls down during the luteal phase.
Subject 2 Shows a peak on the 14th Day of the menstrual cycle. The level is maintained high in the luteal phase.

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  5. What happens if implantation does not occur?

In the figure given below, parts A and B show the level of hormones which influence the menstrual cycle. Study the figure and answer the questions that follow:

  1. Name the organs which secrete the hormones represented in parts A and B.
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Answer the following questions by observing the diagram of menstrual cycle: 

  1. What is the period of menstruation?
  2. On which day does ovulation occur during the menstrual cycle?
  3. In the menstrual cycle which reproductive organs undergo changes?
  4. Which period is said to be the period of regeneration of endometrium?
  5. Which period is said to be the period of secretions of glands in endometrium?

Complete the following table by writing the name of the structure or the function of the given structure:

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1. Corpus luteum 1. ______
2. ______ 2. Produces male gametes in mass
3. Leydig cells 3. ______
4. ______ 4. Stores the sperms until they mature and become mobile
5. Umbilical cord 5. ______
6. Fallopian tube 6. ______

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