CBSE Class 12 Biology Reproduction in Human Beings. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
1 a) When and how does placenta develop in human female?
b) How is the placenta connected to the embryo?
c) Placenta acts as an endocrine gland. Explain.
2 Explain the different stages of Oogenesis in humans starting from foetal life till its completion. When and where in the body is oogenesis completed?
3 Describe the process of spermatogenesis. Where does it occur in human male?
4 Trace the development of zygote till implantation.
5 Represent diagrammatically spermatogenesis and oogenesis.
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