Q18 of 30 Page 1

How do ‘implants’ act as an effective means of contraception in human females? Mention one advantage of the implants over the pills.

Implants act as an effective means of conception in human females as they release their dose in small and steady amounts and keep the body/ uterus already prepared so that pregnancy may not take place. They either change the timing of ovulation or change the environment of uterus and cervix non susceptible or make endometrial layer non susceptible for implantation.

The advantage of implant over the pill is that a pill should be taken within 48 hrs of coitus but there is no hurry with an implant. If it is already there then nothing to worry but if not then you have a 72 hr window to get an implant.


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OR


Give reasons why ‘hot spot’ regions of the world are identified for maximum protection by conservationists. Name any two hot spots in India.


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(a) Name the disorder and any two symptoms caused by the gain of an extra copy of Chromosome 21.

 20

The collection of certain moths after industrialisation in England (1920), showed population of light winged less than that of dark winged moths, which was reverse of the observation made prior to industrialisation (1850s). Explain the observation made, with reference to Darwinian natural selection.