Biology
Given below are diagrams showing the different stages in the process of fertilisation of an egg in the human female reproductive tract.
Study the diagrams and answer the questions:
(i) Arrange the letters given below each diagram in a logical sequence to show the correct order in the process of fertilisation.
(ii) Where does fertilisation normally take place? What is 'Implantation' that follows fertilisation?
(iii) Mention the chromosome number of the egg and zygote in humans.
(iv) Explain the term 'Gestation'. How long does Gestation last in humans?
(v) Draw a neat, labelled diagram of a mature human sperm.
Reproductive System
ICSE 2018
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Answer
(i) DCBA (It can also be CBAD as there is not a clear difference between egg cell and zygote)
(ii) Fertilization usually takes place in fallopian tube (oviduct) that links an ovary to the uterus. The process of fixing of the blastocyst to the wall of the uterus/endometrium is termed implantation.
(iii) Chromosome number of the egg is 23 and zygote is 46 / 23 pairs.
(iv) The period of full term development of the embryo in the uterus. This period lasts for 280 days. It is the period between implantation and birth of baby.
(v) Labelled diagram of a mature human sperm is shown below:
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