In a human female, menstrual cycle of 28 days is represented by the diagram given below. Select the correct statement related with this diagram.
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Progesterone plays a crucial role in preparing the uterus for pregnancy and maintaining it during the early stages, especially if the fertilized egg implants successfully.
Primary follicle of ovary matures into Graafian follicle in phase II.
The hormone secreted in large amounts in phase III is also responsible for maintaining pregnancy in human females.
Corpus luteum secretes progesterone in phase I, however it degenerates completely in phase III.
Both (A) and (B).
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The Correct Option isD
Solution and Explanation
Step 1: Understanding the phases of the menstrual cycle.
The menstrual cycle in human females is divided into three phases: Phase I, Phase II, and Phase III. The phases are associated with different hormonal changes and physiological events in the body. The diagram shown represents the timeline of these phases.
Step 2: Analysis of options.
(A) Primary follicle of ovary matures into Graafian follicle in phase II: Correct. In Phase II, the primary follicle matures into the Graafian follicle due to the action of hormones like FSH (follicle-stimulating hormone).
(B) The hormone secreted in large amounts in phase III is also responsible for maintaining pregnancy in human females: Correct. In Phase III, progesterone is secreted by the corpus luteum, and this hormone is crucial for maintaining pregnancy.
(C) Corpus luteum secretes progesterone in phase I, however it degenerates completely in phase III: Incorrect. The corpus luteum starts secreting progesterone in Phase II, not Phase I, and it degenerates if pregnancy does not occur, typically after Phase III.
Step 3: Conclusion.
Thus, the correct answer is (D) Both (A) and (B), as both statements are accurate in the context of the menstrual cycle.
Final Answer: Both (A) and (B).
