Reproduction

Step 1: Sexual reproduction forms male and female gametes. Step 2: Their fusion forms a zygote. Step 3: This fusion is called fertilisation.

Step 1: Ovule is present inside the ovary. Step 2: After fertilisation an embryo can develop in it. Step 3: Therefore ovule usually becomes a seed.

Step 1: The ovary of flower protects ovules. Step 2: After fertilisation the ovary grows. Step 3: This ovary usually becomes the fruit.

Step 1: A seed contains an embryo plant. Step 2: Under favourable conditions the seed germinates. Step 3: A new plant forms from it.

Step 1: A seed needs water to become active and grow. Step 2: Air is needed for respiration and suitable temperature for growth. Step 3: So water air and temperature are important for germination.

Step 1: Male gametes are formed in the male reproductive system. Step 2: These male gametes are called sperms. Step 3: A sperm can fuse with an egg in fertilisation.

Step 1: The female reproductive system forms female gamete. Step 2: This female gamete is called egg. Step 3: During fertilisation egg can fuse with sperm.

Step 1: Testes are main organs of the male reproductive system. Step 2: Sperms are produced in the testes. Step 3: Link testes with sperm production.

Step 1: Ovaries are main organs of the female reproductive system. Step 2: Ovaries produce eggs. Step 3: Remember ovary with egg production.

Step 1: Egg moves from ovary into the fallopian tube. Step 2: Sperm can fuse with egg here. Step 3: Therefore fertilisation usually occurs in the fallopian tube.

Step 1: Fusion of male and female gametes forms a new cell. Step 2: This first cell is called zygote. Step 3: The zygote divides further to form an embryo.

Step 1: After fertilisation the zygote divides. Step 2: The embryo attaches to the wall of uterus and grows. Step 3: Therefore uterus is the place of embryo development.

Step 1: The embryo needs nutrients and oxygen in the uterus. Step 2: Wastes also need to be removed. Step 3: Placenta helps exchange materials between mother and embryo.

Step 1: The uterus prepares an inner lining for pregnancy. Step 2: If pregnancy does not occur this lining breaks and comes out. Step 3: This process is called menstruation.

Step 1: During adolescence the body begins to mature. Step 2: Hormones start many changes in the body. Step 3: These changes help develop reproductive ability.

Step 1: Sperms are formed in testes. Step 2: Testes are located in a sac outside the body. Step 3: Slightly lower temperature is suitable for sperm formation.

Step 1: Contraception is related to reproductive control. Step 2: It can reduce the chance of fertilisation or pregnancy. Step 3: Link it with family planning and health.

Step 1: Condom prevents sperm from reaching the egg. Step 2: It works like a physical barrier. Step 3: Therefore it is called a barrier contraceptive method.

Step 1: In sterilisation reproductive ducts are operated upon. Step 2: This blocks the path of gametes. Step 3: Therefore it is a surgical contraceptive method.

Step 1: Some diseases can spread through the reproductive route. Step 2: Unsafe sexual contact increases their spread. Step 3: Safe behaviour and awareness are important.