In a human female, the reproductive phase starts on the onset of puberty and ceases around middle age of the female. Study the graph given below regarding menstrual cycle and answer the questions that follow:
(a) Name the hormones and their source organ, which are responsible for menstrual cycle at puberty.
In a human female, the reproductive phase starts on the onset of puberty and ceases around middle age of the female. Study the graph given below regarding menstrual cycle and answer the questions that follow:
(a) Name the hormones and their source organ, which are responsible for menstrual cycle at puberty.
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Solution and Explanation
- Hormones: Follicle Stimulating Hormone (FSH) and Luteinising Hormone (LH).
- Source organ: Pituitary gland.
Top Questions on Menstrual Cycle
- Assertion (A): Corpus luteum secretes the hormone, progesterone. Reason (R): Hormone Progesterone is essential for maintenance of the endometrium.
- CBSE CLASS XII - 2025
- Biology
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- Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
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Reason R: Rapid secretion of LH in the middle of menstrual cycle induces rupture of Graafian follicle and thereby the release of ovum.
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- (b) For successful pregnancy, at what phase of the menstrual cycle an early embryo (up to 3 blastomeres) should be implanted in the uterus (IUT) of a human female who has opted for Assisted Reproductive Technology (ART)? Support your answer with a reason.
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(1) Menstruation
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Questions Asked in CBSE CLASS XII exam
Answer the following questions:
[(i)] Explain the structure of a mature embryo sac of a typical flowering plant.
[(ii)] How is triple fusion achieved in these plants?
OR
[(i)] Describe the changes in the ovary and the uterus as induced by the changes in the level of pituitary and ovarian hormones during menstrual cycle in a human female.
- CBSE CLASS XII - 2025
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- In his experiment on photoelectric effect, Robert A. Millikan found the slope of the cut-off voltage versus frequency of incident light plot to be \( 4.12 \times 10^{-15} \, \text{Vs} \). Calculate the value of Planck’s constant from it.
- CBSE CLASS XII - 2025
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Write a letter to the editor of a local newspaper expressing your concerns about the increasing “Pollution levels in your city”. You are an environmentalist, Radha/Rakesh, 46, Peak Colony, Haranagar. You may use the following cues along with your own ideas:
- CBSE CLASS XII - 2025
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Simar, Tanvi, and Umara were partners in a firm sharing profits and losses in the ratio of 5 : 6 : 9. On 31st March, 2024, their Balance Sheet was as follows:
Balance Sheet of Simar, Tanvi, and Umara as at 31st March, 2024
Liabilities Amount (₹) Assets Amount (₹) Capitals: Fixed Assets 25,00,000 Simar 13,00,000 Stock 10,00,000 Tanvi 12,00,000 Debtors 8,00,000 Umara 14,00,000 Cash 7,00,000 General Reserve 7,00,000 Profit and Loss A/c 2,00,000 Trade Payables 6,00,000 Total 52,00,000 Total 52,00,000 Umara died on 30th June, 2024. The partnership deed provided for the following on the death of a partner:
- Goodwill of the firm be valued at 3 years purchase of average profits for the last 5 years. The profits/losses for the previous four years were:
- 2022-23: ₹ 3,10,000 (loss)
- 2021-22: ₹ 3,00,000 (profit)
- 2020-21: ₹ 4,00,000 (profit)
- 2019-20: ₹ 2,50,000 (profit)
- Umara’s share of profit or loss till the date of her death was to be calculated on the basis of profit or loss for the year ended 31st March 2024.
- Calculate Goodwill of the firm.
- Pass the necessary journal entry for the treatment of goodwill on Umara’s death.
- Calculate Umara’s share in the profit or loss of the firm till the date of her death.
- Pass the necessary journal entry to record Umara’s share of profit or loss till the date of her death.
- CBSE CLASS XII - 2025
- Profit and Loss Account
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