This is the correct option. The cells involved in sexual reproduction are called gametes.

An intrauterine device (IUD) is a small contraceptive device that is inserted into the uterus (womb) to prevent pregnancy. The two types available are copper IUD and hormonal IUD.

Rhizopus reproduces asexually by spore formation.

The little stalk with swollen tops just inside the ring of petals in a flower is called stamen.

A cotyledon is a significant part of the embryo within the seed of a plant.

Layering method is used for the propagation (or reproduction) of plants like hibiscus.

The middle piece consists of a sheath of ring-shaped mitochondria grouped around the axoneme to provide energy for flagellar movement.

Some plants like potato, ginger and sweet potato develop into new plants from the ‘eye’ of that plant, i.e. they undergo vegetative propagation.

Hydra reproduces by budding.

Fertilisation in humans occurs in the oviduct of the female. 

It is a part of the female reproductive system. It is present between the uterus and vagina. Therefore, the correct answer is cervix.

As fertilisation between sperm and ovum takes place in the fallopian tube, the best way to prevent pregnancy is to cut the two slender tubes (fallopian tubes) and burn, clip or band the cut ends. Thus, tube ligation prevents pregnancy from occurring.

Stamens and carpels are reproductive parts of a flower, which contain germ cells.

Birth control pills, use of mechanical barriers and blocking of fallopian tubes or vas deferens are contraceptive methods.

Bacterial infections such as gonorrhoea and syphilis, and viral infections such as warts and HIV AIDS are sexually transmitted diseases.