How is 'oogenesis' markedly different from 'spermatogenesis' with respect to the growth till puberty in the humans?

102.

Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.

Mention any three characteristics of Neanderthal man that lived in near east and central Asia.

(a) Name the technology that has helped scientists to propagate on a large scale the desired crops in a short duration. List the steps carried out to propagate the crops by the said technique.

(b) How are somatic hybrids obtained?

Describe the process of Parturition in humans.

During the reproductive cycle of a human female, when, where and how does a placenta develop? What is the function of placenta during pregnancy and embryo development?

When and where do chorionic villi appear in humans? State their function.

Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions.

(a) Acrosome

(b) Nucleus

(c) Middle piece

(a) Draw a diagrammatic sectional view of the female reproductive system of human and label the parts:

(i) where the secondary oocytes develop

(ii) which helps in collection of ovum after ovulation

(iii) where fertilization occurs

(iv) where implantation of embryo occurs.

Write the location and function of the sertoli cells in humans.