The diagram shows the changes in the ovary and to the lining of the uterus during 28 days - Edexcel - GCSE Biology - Question 6 - 2017 - Paper 1
Question 6
The diagram shows the changes in the ovary and to the lining of the uterus during 28 days.
(a) (i) Name the event that takes place
between days 0 - 5.
(ii) at ... show full transcript
Worked Solution & Example Answer:The diagram shows the changes in the ovary and to the lining of the uterus during 28 days - Edexcel - GCSE Biology - Question 6 - 2017 - Paper 1
Step 1
Name the event that takes place between days 0 - 5.
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Answer
The event that takes place between days 0 - 5 is the menstrual phase, during which the old uterine lining is shed.
Step 2
Name the event at day 14.
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Answer
At day 14, ovulation occurs, marked by the release of a mature egg from the ovary.
Step 3
Name the two hormones responsible for the changes to the lining of the uterus.
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Answer
The two hormones responsible for the changes to the lining of the uterus are estrogen and progesterone.
Step 4
Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The uterus lining is maintained after fertilisation (X).
Step 5
State why the uterus lining is maintained.
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Answer
The uterine lining is maintained to support the implantation of a fertilized egg and to provide the necessary nutrients for early embryonic development.
Step 6
Explain how the structures of a human egg cell and a sperm cell are adapted to their function.
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The human egg cell is large and has a nutrient-rich cytoplasm, which provides sustenance for the developing embryo. Its outer layer is protective and facilitates sperm binding. The sperm cell, on the other hand, is streamlined with a flagellum for mobility, allowing it to travel through the female reproductive tract. It contains enzymes in its acrosome that help penetrate the egg's protective layers during fertilization.
