Human Health and Disease — BIOLOGY STD 12 Science — Question

Answer the following questions:
Differentiate between gametogenesis in human males and females on the basis of:

1. Time of initiation of the process.
2. Products formed at the end of the process.

(a) IVF is a very powerful method these days that is helping childless couples to bear a child. Describe the different steps that are carried out in this technique.
(b) Would you consider Gamete Intrafallopian transfer (GIFT) as on IVF? Give a reason in support of your answer.

Describe in detail the various levels of biodiversity.

What do you understand by Parturition? Discuss the parturition and lactation process in human.

What is malaria ? Write down reason, symptoms, prevention and treatment.###Write about the malaria fever, its causes, symp-toms, control and prevention.###Name the different species of plasmodium which species is responsible for malignant malaria?

Explain the carbon cycle with the help of a simplified model.

A. Cryptorchidism is a condition in which the testes fail to descend into the scrotum. It can also lead to compromised Sertoli cell function and has an impact on Leydig cell function.
(i) Identify at least 3 parameters of male fertility which get affected due to cryptorchidism.
(ii) Which process will be affected if mature spermatids are not released from Sertoli cells?
(iii) Name and explain one assisted reproductive technology (ART process) in which the sperm/semen is used to assist fertilization.
(iv) Name and explain the assisted reproductive technology that should be used to complete the development of embryos I and II shown in the figure given below.

“Forests provide us unlimited benefits.”Explain how this happens with the help of three different areas.

What is spermatogenesis? Briefly describe the process of spermatogenesis.