IGCSE Biology Paper-3: Specimen Questions with Answers 268 - 269 of 358

Get unlimited access to the best preparation resource for Bank-PO : get questions, notes, tests, video lectures and more- for all subjects of Bank-PO.

Passage

shows a diagram of the human female reproductive system.

Reproductive System

Question 268 (1 of 4 Based on Passage)

Edit

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.

Question 269 (2 of 4 Based on Passage)

Edit

Write in Short

Short Answer▾

Using letters P – U, identify the parts of the human female reproductive system in Fig. 11.1.

where eggs are made …

where fertilization occurs …

where implantation of the zygote occurs …

Explanation

where eggs are made … T …

where fertilization occurs … S …

where implantation of the zygote occurs … P …

Ovary

  • The ovary is the primary female sex organ.
  • Ovary produces ova and secretes female sex hormones viz. , estrogens and progesterone

Fertilization

Fusion of a haploid male gamete and a female gamete to form a diploid cell, the zygote, is called fertilization. Fusion of gametes in the fertilization is called as syngamy. Fusion of cytoplasm is plasmogamy and fusion of nucleus is karyogamy.

Implantation

In humans, implantation is the stage of pregnancy at which the embryo adheres to the wall of the uterus. At this stage of prenatal development, the conceptus is called a blastocyst. It is by this adhesion that the embryo receives oxygen and nutrients from the mother to be able to grow.

Developed by: