Question

Question 27
Observe the following figures.
(a)

(b)

(c)

(d)

(i) Identify the stages in the figure during development of human baby.
(ii) Arrange the stages in correct sequence of development.
(iii) Explain the development that takes place in any one stage.

Answer 1

(i)
(a) Embedding of the embryo in the uterus.
(b)Fertilization.
(c)Zygote formation and development of an embryo from the zygote.
(d)Zygote showing fusion of nuclei.

(ii) The correct sequence is c, b, d, a
(iii) Zygote formation The sperm and the egg nuclei fuses to form a single nucleus resulting in the formation of a fertilized single cell called a zygote.
(Note: One step is explained as an example. Students may explain any other step.)