Reproduction

Step 1: Hormones bring body changes during adolescence. Step 2: In boys the voice box may grow. Step 3: This can make the voice deeper.

Step 1: Condom prevents sperm from reaching the egg. Step 2: It can also reduce direct contact with many disease causing agents. Step 3: Therefore it is linked with contraception and sexual health.

Step 1: Copper T is a contraceptive device placed in the uterus. Step 2: It reduces the chance of pregnancy. Step 3: Therefore it is considered an internal contraceptive method.

Step 1: Some contraceptive pills affect hormones. Step 2: This can influence the release of egg. Step 3: Therefore the chance of pregnancy decreases.

Step 1: Surgery is done on sperm duct in male or fallopian tube in female. Step 2: This blocks the path of gametes. Step 3: Therefore it is considered a permanent contraceptive method.

Step 1: Some diseases spread through the reproductive route. Step 2: Unsafe contact increases the risk of infection. Step 3: Safe behaviour and awareness are important for prevention.

Step 1: Hygiene of reproductive organs reduces risk of infection. Step 2: Correct information prevents wrong fear and wrong decisions. Step 3: Therefore both are important for reproductive health.

Step 1: Two gametes fuse in sexual reproduction. Step 2: If both carry half the number their fusion restores the normal number. Step 3: This keeps chromosome number stable across generations.

Step 1: Fertilisation forms the zygote. Step 2: The zygote divides repeatedly. Step 3: This group of cells develops into an embryo.

Step 1: Pollen reaches the stigma. Step 2: The ovule is inside the ovary. Step 3: Pollen tube forms a path for the male gamete to reach the ovule.

Step 1: Stamen is the male reproductive part of a flower. Step 2: Pistil is the female reproductive part. Step 3: If only stamens are present the flower is male.

Step 1: Stamen is the male part. Step 2: Pistil is the female part. Step 3: If both are present in the same flower it is called bisexual flower.

Step 1: Pollen grains are formed in the anther. Step 2: They must reach the stigma. Step 3: Wind insects water or other agents can help in this transfer.

Step 1: After fertilisation the ovary becomes fruit. Step 2: Seeds can remain protected inside the fruit. Step 3: Many fruits also help in dispersal of seeds.

Step 1: Asexual reproduction produces offspring from one parent's information. Step 2: Offspring may be very similar. Step 3: Low variation can limit adaptation in a changing environment.

Step 1: Sexual reproduction needs gamete formation and fusion. Step 2: Genetic information from two parents combines. Step 3: This can increase variation which is useful in changing environments.

Step 1: Egg is produced in the ovary. Step 2: A mature egg can be released from the ovary. Step 3: This process is called ovulation.

Step 1: An embryo forms after fertilisation. Step 2: It attaches to the uterus wall and grows. Step 3: Therefore the uterus provides a safe place for embryo development.

Step 1: Reproductive health is not limited to knowing body structure. Step 2: Safe behaviour and family planning are also important. Step 3: Correct education helps prevent sexually transmitted diseases and unwanted pregnancy.

Step 1: Reproduction produces a new generation. Step 2: Asexual reproduction can be fast and simple. Step 3: Sexual reproduction can increase variation by combining information from two parents.