IGCSE Biology Paper-3: Specimen Questions with Answers 267 - 268 of 358
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Passage
Many flowering plants can reproduce sexually and asexually.
Question 267 (7 of 7 Based on Passage)
Explanation
Asexual reproduction is a type of reproduction where fertilization does not take place as only a single parent is involved. Offspring produced is identical to the parent because they are produced as clones.
Passage
shows a diagram of the human female reproductive system.
Question 268 (1 of 4 Based on Passage)
Write in Short
Short Answer▾Oestrogen is a hormone responsible for the development of secondary sexual characteristics during puberty.
State the name of the part of the female reproductive system that secretes oestrogen.
Explanation
In women, estrogen is produced mainly in the ovaries. Ovaries are grape-sized glands located by the uterus and are part of the endocrine system.
- Estrogen is also produced by fat cells and the adrenal gland. At the onset of puberty, estrogen plays a role in the development of so-called female secondary sex characteristics, such as breasts, wider hips, pubic hair, and armpit hair.
- Estrogen also helps regulate the menstrual cycle, controlling the growth of the uterine lining during the first part of the cycle. If the woman՚s egg is not fertilized, estrogen levels decrease sharply and menstruation begins. If the egg is fertilized, estrogen works with progesterone, another hormone, to stop ovulation during pregnancy.