Surgical method of contraception prevents gamete transport. In males it is called vasectomy and in females it is called tubectomy.

Tricomoniasis is one of most common type of sexually transmitted disease , caused by a parasite . While HIV , HPV & Herpes can be spread by causes or than unprotected sex with infected person .

 The carrying capacity for any species is maximum number of individuals that can be indefinitely supported at a given consumption level by some specific environmental conditions. Intraspecies and interspecies interactions like predation, resources and competition between organisms all affect sustainable population size of an environment.

So, correct answer is 'All of se can affect population size'

Density of population indicates number of people living per square kilometer. The approximate national average for Density of Population is 400 persons per square kilometer. Density of population is not same for all states in India. It depends upon both- endowment of natural resources and level of development.

1960 The first oral contraceptive, Enovid, was approved by US Food and Drug Administration (FDA) as contraception.

Dependency rate is above 37 in India. It measures ratio between dependent population and working population, that means, ratio between number of dependents aged zero to 14 and over age 65 to total population aged 15 to 64.

Malaria is disease which is spread by mosquitoes. Anopheles mosquito is known to be carriers or vectors for malarial parasites Plasmodium. These malarial parasites complete its life cycle in two hosts, first when it enters human body as sporozoites from body of mosquito which grows as merozoites in human blood stream and moves on as gametocytes back to body of mosquito. 

The presence of progesterone and estrogen prevent secretion of Follicle Stimulating hormone and Luteinising hormone that are required for maturation of primary follicle and ovulation from Graffian follicle.

Sex education at a proper age is very important so as to maintain a healthy reproductive society. Also we need proper medical facilities & good knowledge of birth control devices to maintain same