Given below are diagrams showing the different stages in the process of fertilisation of an egg

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:

1. Arrange the letters given below each diagram in a logical sequence to show the correct order in the process of fertilisation.
2. Where does fertilisation normally take place? What is ‘Implantation’ that follows fertilisation?
3. Mention the chromosome number of the egg and zygote in humans.
4. Explain the term ‘Gestation’. How long does Gestation last in humans?
5. Draw a neat, labelled diagram of a mature human sperm.

Answer

1. D C B A/ C B A D
2. Oviduct, fixing of the embryo in the wall of uterus
   or
   Fallopian tube blastocyst in the wall of uterus
3. Egg – 23, Zygote – 46 / 23 pairs
4. Full term development of the embryo in the uterus, 280 days / 40 weeks/9 months. It is the period between implantation and birth of baby
5.