Question

3. Where does fertilisation occur in human beings? How does the zygote formed
eventually develop into an infant?​

Answer 1

Answer:

Explanation:

Fertilization takes place in the fallopian tubes, which connect the ovaries to the uterus.

Stages of human development:-

(i) Zygotic stage: The zygote is formed when the male gamete (sperm) and female gamete (egg) fuse.

(ii) Blastocyst stage: The single-celled zygote begins to divide into a solid ball of cells. Then, it becomes a hollow ball of cells called a blastocyst, attaching to the lining of the mother's uterus.

(iii) Embryonic stage: The major internal organs and external features begin to emerge, forming an embryo. In this stage, the heart, brain, and spinal cord become visible. Arms and legs start to develop.

(iv) Fetal stage: Once the formed features of the embryo begin to grow and develop, the organism is considered a fetus. Differentiation and specialization of structures happens during this time.