Physiological (Oral) Contraceptive « Devices.

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Answer

Physiological devices are in the form of oral contraceptive pills or birth control pills. 5 They are hormonal preparations and check ovulation by inhibiting the secretion of follicle stimulating hormone and luteinizing hormone.
Woman who is using pills does not release ovum at the time of ovulation and therefore conception does not occur.
Birth control pills have side effects such as nausea, breast tenderness, weight gain and ‘break through’ bleeding, i.e. slight bleeding between the menstrual periods. These health hazards are due to synthetic hormones.
These pills also alter the quality of cervical J mucus to prevent the entry of sperms.
The birth control pills contain progesterone and estrogen. Mala-D to be taken daily and Saheli to be taken weekly are two common birth control pills in India. These pills are non-steroidal.

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You are given tall pea plants with yellow seeds, whose genotypes are unknown. How would you find the genotype of these plants? Explain with the help of cross.
Identify A, B and C in the table given below:

Pattern of Inheritance	Monohybrid $F_1$ Phenotypic Expression
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‘B’	Progeny resembled only one of the parents.
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