- ADecreases sperm motility
- BIncreases sperm motility
- ✓Barrier to prevent fusion of sperm and ova
- DIncreases phagocytosis
These methods prevent the contact of sperm and ovum with the help of barriers. Such methods are $(i)$ Condoms are the barriers made of thin rubber/latex sheath used to cover the penis in the male or vagina and cervix in female. It prevents the deposition of the ejaculated semen into the vagina of the female. $(ii)$ Diaphragms, cervical cap and vaults are the barriers made of rubber that are inserted into the female reproductive tract to cover the cervix during coitus. $(iii)$ Spermicidal creams, jellies and foams are used along with these barriers to increase their contraceptive efficiency
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$I$. There are no favourable seasons in tropics
$II$. Less solar energy is available in tropics
$III$. Rate of extinction is low in tropics
$IV$. Resource availability is higher in tropics
Choose the correct option
