How Do Organisms Reproduce

Female germs cells are called eggs and male germ cells are called sperms.

Angiosperms are seed-bearing vascular plants. In angiosperms, reproductive organs are located in the flower.

In binary fission, organism divides and forms two daughter cells.

Testis is the main reproductive organ in males. A pair of testes is placed in a structure called scrotum, which is located outside the abdominal cavity.

Reproduction in plants can occur in all the given ways.

The sperms enter through the vaginal passage during sexual intercourse. They travel upwards and reach the oviduct where they may
encounter the egg. The fertilised egg, i.e. the zygote, gets implanted in the lining of the uterus.

The pollen needs to be transferred from the stamen to the stigma. If this transfer of pollen occurs in the same flower, it is referred to as self-pollination. On the other hand, if the pollen is transferred from one flower to another, it is known as cross-pollination.

Paternity can be checked by DNA matching.

The main examples are banana, pineapple, rose, jasmine, etc. in which vegetative propagation is practised.

Cross pollination is not a type of vegetative propagation.

Option 1 is the correct answer because flowers that bear pistils only are called pistillate flowers, which are considered as female flowers, and those that bear stamens only are called staminate flowers, which are considered as male flowers.

Grafting is the method in which two plants are joined together in such a way that they unite and grow as one plant.

If an individual is somehow cut or broken up into many pieces, many of these pieces grow into separate individuals. For example, simple animals like Hydra and Planaria can be cut into any number of pieces and each piece grows into a complete organism. 

Plasmodium reproduces asexually through multiple fission.

Stamen is the male reproductive part of a flower and it produces pollen grains that are yellowish in colour.