The diagram shows the changes in the ovary and 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 the lining of the uterus during 28 days.
(a) (i) Name the event that takes place
between days 0 - 5.
(ii) Name t... show full transcript
Worked Solution & Example Answer:The diagram shows the changes in the ovary and 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, where the lining of the uterus is shed.
Step 2
Name the event at day 14.
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Answer
The event at day 14 is ovulation, when a mature egg is released 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 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 correct answer is A. fertilisation. After fertilisation, the uterine lining is maintained to support the developing embryo.
Step 5
State why the uterus lining is maintained.
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Answer
The uterus lining is maintained to provide a suitable environment for a fertilized egg to embed and develop, ensuring the necessary nutrients and support for embryonic growth.
Step 6
Explain how the structures of a human egg cell and a sperm cell are adapted to their function.
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Answer
The human egg cell, or ovum, is large and has a nutrient-rich cytoplasm that provides energy for the initial stages of development after fertilisation. It also has a protective zona pellucida that facilitates sperm binding and prevents entry of multiple sperm.
The sperm cell, on the other hand, is streamlined and has a flagellum that enables it to swim towards the egg. It contains enzymes in the acrosome that help it penetrate the egg's outer layers. Additionally, sperm cells are small, allowing them to move efficiently through the female reproductive tract.
