The diagram shows some of the early stages in the development of a human embryo - Leaving Cert Biology - Question 5 - 2021
Question 5
The diagram shows some of the early stages in the development of a human embryo.
(a) Name the event that occurs at A in the diagram.
(b) Identify the hormone respo... show full transcript
Worked Solution & Example Answer:The diagram shows some of the early stages in the development of a human embryo - Leaving Cert Biology - Question 5 - 2021
Step 1
Name the event that occurs at A in the diagram.
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Answer
The event that occurs at A in the diagram is known as Ovulation. This is when an ovary releases an egg, which is critical for fertilization.
Step 2
Identify the hormone responsible for the event named at part (a) above.
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The hormone responsible for ovulation is the Luteinizing Hormone (LH). This hormone triggers the release of the egg from the ovary.
Step 3
Identify the stages labelled B and C in the development of the embryo.
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Answer
B: Morula
C: Blastocyst. The morula stage is a solid ball of cells, whereas the blastocyst stage consists of a hollow structure that is essential for implantation.
Step 4
What event is illustrated by D in the diagram?
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D illustrates the event of Implantation. This is the process where the blastocyst embeds itself into the uterine lining.
Step 5
Name the two tissues involved in the formation of the placenta.
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Answer
Tissue 1: Endometrium or uterine lining.
Tissue 2: Embryonic tissue (also known as trophoblastic tissue) which contributes to the formation of the placenta.
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