Birth control

Correct answer: A. Responsible planning of the number of children and the spacing between births

Explanation: Family planning is based on voluntary, informed choices about whether to have children, when to have them, how many to have, and how to space pregnancies. These decisions can improve maternal and child health and support responsible reproductive care. Therefore, option A is correct. Family planning does not mean forcing every couple to avoid children, promoting uncontrolled growth, or ending health services.

Correct answer: A. Measures to prevent pregnancy or reduce its likelihood

Explanation: Contraception refers to methods used to prevent pregnancy or reduce its likelihood. Condoms, contraceptive pills, and intrauterine devices are examples. Sperm formation, milk production, and embryo development are different biological processes, so option A is correct.

Correct answer: A. Condom

Explanation: A barrier contraceptive works by creating a physical block that prevents sperm from reaching the ovum. A condom is placed over the penis and functions in this way; it can also reduce the risk of some sexually transmitted infections when used correctly. Copper-T is an IUD, the pill is hormonal, and vasectomy is a surgical method. Hence, option A is correct.

Correct answer: A. Intrauterine device (IUD)

Explanation: Copper-T is a copper-releasing intrauterine device inserted into the uterine cavity by a trained healthcare professional. Copper ions impair sperm motility and fertilising ability, helping prevent fertilisation. It is not swallowed like an oral pill, does not act as an external barrier like a condom, and is not a permanent surgical procedure. Therefore, option A is correct.

Correct answer: A. Uterus

Explanation: The term intrauterine literally means “within the uterus,” and an IUD is placed in the uterine cavity by a trained healthcare professional. Its location allows it to influence sperm function and the uterine environment. It is not inserted into the ovary, vagina, or fallopian tube. Thus, option A is correct because the uterus is the organ named by the device’s classification.

Correct answer: A. They reduce sperm motility and fertilising capacity.

Explanation: Copper ions released by a copper IUD create an environment that is unfavorable to sperm, reducing their motility and fertilising capacity. Less motile sperm are less able to travel through the female reproductive tract, and reduced fertilising ability lowers the chance of fertilisation. Therefore, option A is correct. The other choices describe effects opposite to the contraceptive action.

Correct answer: A. Hormonal control

Explanation: Oral contraceptive pills use reproductive hormones or hormone-like compounds to alter the normal cycle. Their main action is usually inhibition of ovulation; they may also thicken cervical mucus and change the uterine lining, reducing the likelihood of fertilisation and implantation. Thus, option A is correct. A mechanical barrier is typical of condoms, while radiation and blood donation have no contraceptive role.

Correct answer: A. It is a non-steroidal oral contraceptive pill.

Explanation: Saheli is a non-steroidal oral contraceptive containing centchroman, also known as ormeloxifene. Its major identifying feature is that it is taken orally but is not a conventional steroid-based pill. It is therefore different from an IUD placed in the uterus, a male barrier method such as a condom, or a permanent surgical method. Option A is correct.

Correct answer: A. After unprotected intercourse or contraceptive failure, as soon as possible; in the textbook context, generally within 72 hours

Explanation: Emergency contraceptive pills are used after unprotected intercourse or contraceptive failure to reduce the chance of unintended pregnancy. They should be taken as soon as possible. In the Class 12 textbook context, their use is commonly described within 72 hours, and they do not prevent sexually transmitted infections.

Correct answer: A. Males

Explanation: Vasectomy is a male surgical sterilization method and therefore the correct answer is males. In this procedure, the vas deferens, which carry sperm from the testes, are cut, sealed, or blocked. Sperm then cannot enter the semen, although hormone production and sexual function generally continue. Tubectomy is the corresponding female sterilization method; foetuses are not treated by either procedure.

Correct answer: B. Females

Explanation: Tubectomy is a permanent surgical contraceptive method performed in females. The fallopian tubes are cut, tied, or blocked, preventing the ovum and sperm from meeting. The corresponding male sterilization method is vasectomy, which involves blocking the vas deferens.

Correct answer: A. Periodic abstinence

Explanation: Periodic abstinence involves avoiding sexual intercourse during the fertile days of the menstrual cycle. It is considered a natural method because it does not require a contraceptive device, medicine, or surgery. Copper-T is an intrauterine device, a condom is a barrier method, and tubectomy is a permanent surgical method.

Correct answer: A. Absence of menstruation during exclusive or nearly exclusive breastfeeding after childbirth

Explanation: LAM is based on the temporary suppression of ovulation associated with exclusive or nearly exclusive breastfeeding after childbirth. It is generally effective only when menstruation has not returned, the infant is mainly breastfed, and the infant is younger than six months. The other options describe an intrauterine device, vasectomy, and hormonal contraception.

Correct answer: A. The penis is withdrawn from the vagina before ejaculation

Explanation: Coitus interruptus, also called the withdrawal method, involves withdrawing the penis from the vagina before ejaculation. Its purpose is to reduce the chance of semen entering the female reproductive tract, although it is not completely reliable. The other options describe an intrauterine device, tubectomy, and a hormonal contraceptive pill.

Correct answer: A. Barrier method

Explanation: A diaphragm is a flexible, dome-shaped device placed in the vagina to cover the cervix. It acts as a physical barrier that prevents sperm from entering the uterus, so it is classified as a barrier method. It does not work by releasing hormones, surgery, or relying only on the timing of the menstrual cycle.

Correct answer: A. Destroy sperm or reduce their motility

Explanation: Spermicidal creams contain chemicals that kill sperm or reduce their motility. This makes it more difficult for sperm to move through the female reproductive tract and reach the ovum, thereby reducing the chance of fertilisation. They do not increase ovum production, promote embryo implantation, or stimulate milk secretion.

Correct answer: A. Condom

Explanation: A condom is a barrier contraceptive that helps prevent sperm from entering the female reproductive tract. When used correctly and consistently, it reduces the risk of pregnancy and lowers the risk of transmitting several STIs, including HIV. Copper-T, oral pills, and tubectomy do not protect against STIs.

Correct answer: A. The method’s suitability for the person’s health, needs, and circumstances

Explanation: A contraceptive method should be selected according to the person’s health, reproductive goals, preferences, and possible risks or side effects. Guidance from a qualified healthcare professional can support an informed choice, whereas advertisements, random decisions, and peer pressure are not reliable bases for selecting a suitable method.

Correct answer: A. A decline in the death rate while the birth rate remains high

Explanation: Population can increase rapidly when the death rate declines while the birth rate remains high. Improved survival increases the number of people, and a large gap between births and deaths produces rapid growth. Increased education generally supports awareness and family planning, whereas zero fertility would prevent population growth.

Correct answer: A. To promote small, planned families for the health and well-being of parents and children

Explanation: The small-family norm promotes planned and responsible parenthood. A smaller planned family can help parents provide adequate nutrition, healthcare, education and care, thereby supporting the well-being of both parents and children. The other options oppose the goals of reproductive health.

Correct answer: A. Condom

Explanation: A condom is a barrier contraceptive because it forms a physical barrier that prevents sperm from entering the reproductive tract and thereby reduces the chance of fertilisation. Thus option A is correct. Oral contraceptive pills mainly act through hormones, an IUD is placed inside the uterus and may prevent fertilisation or implantation, and sterilisation is a permanent surgical method. These mechanisms distinguish the distractors from a barrier method.

Correct answer: A. By preventing sperm from reaching the ovum

Explanation: Barrier methods such as condoms and diaphragms create a physical obstruction that prevents sperm from reaching the ovum, so fertilisation is less likely; option A is correct. Their principal action is mechanical rather than hormonal. Suppression of ovulation is mainly associated with hormonal contraceptives, stopping menstruation is not the defining mechanism, and changing blood group has no contraceptive role. Therefore the distractors do not explain barrier contraception.

Correct answer: A. Ovulation

Explanation: Many hormonal contraceptives supply or imitate reproductive hormones and alter the normal feedback control of the hypothalamus, pituitary, and ovaries. This commonly prevents the LH surge and therefore inhibits ovulation, the release of an ovum from the ovary; option A is correct. Some methods also thicken cervical mucus or alter the uterine lining, but digestion and respiration are not their intended primary reproductive targets.

Correct answer: A. Vasectomy

Explanation: Vasectomy is a surgical contraceptive method in which the vas deferens are cut, sealed, or blocked so sperm cannot enter the semen; hence option A is correct. It is intended as a permanent method, although reversal may sometimes be attempted. A condom is a barrier method, periodic abstinence is a natural or behavioural method, and spermicidal cream is a chemical method, so none of those is surgical.

Correct answer: A. Vasectomy

Explanation: The governing concept is surgical sterilisation. In vasectomy, the vas deferens are cut, sealed, or blocked, so sperm produced in the testes cannot enter the semen that is ejaculated. It is intended as a permanent contraceptive method, although reversal is not guaranteed. Condoms and spermicidal creams are temporary barrier or chemical methods, while periodic abstinence depends on avoiding intercourse during fertile days. Therefore option A is correct.