Reproduction

Step 1: The female reproductive cell is called egg. Step 2: It is produced in the ovary. Step 3: Fusion of egg and sperm forms a zygote.

Step 1: Testes are major organs of the male reproductive system. Step 2: Sperms are produced in them. Step 3: Testes also produce testosterone hormone.

Step 1: Ovaries are important organs of the female reproductive system. Step 2: Eggs are produced in them. Step 3: Ovaries also produce female hormones.

Step 1: The egg moves from the ovary into the fallopian tube. Step 2: Sperm can meet the egg there. Step 3: Therefore, fertilization usually occurs in the fallopian tube.

Step 1: After fertilization, the zygote divides and forms an embryo. Step 2: The embryo implants in the uterine wall. Step 3: The uterus provides a safe place for embryo development.

Step 1: The embryo needs nutrition and oxygen. Step 2: The placenta helps transfer useful materials from the mother to the embryo. Step 3: It also helps move wastes from the embryo to the mother.

Step 1: The uterine lining thickens to prepare for pregnancy. Step 2: If fertilization does not occur, this lining breaks down. Step 3: It leaves the body as blood and tissue, called menstruation.

Step 1: Reproductive organs begin to mature during adolescence. Step 2: Hormone secretion increases at this time. Step 3: Hormones bring many physical changes in the body.

Step 1: Contraception is a method to prevent pregnancy. Step 2: It helps in family planning. Step 3: Some methods can also help prevent sexually transmitted diseases.

Step 1: A condom prevents sperm from reaching the egg. Step 2: It acts as a physical barrier. Step 3: Therefore, it is called a barrier contraceptive method.

Step 1: In sterilization, the reproductive passage is blocked surgically. Step 2: This prevents gametes from meeting. Step 3: It is generally considered a permanent contraceptive method.

Step 1: Sexually transmitted diseases can spread through sexual contact. Step 2: A condom forms a barrier and reduces contact. Step 3: Therefore, it can help in protection.

Step 1: Sperm is the male gamete. Step 2: Egg is the female gamete. Step 3: Their fusion forms a zygote.

Step 1: Fertilization forms a zygote. Step 2: The zygote divides repeatedly. Step 3: These divisions begin the development of an embryo.

Step 1: Testes produce sperms. Step 2: Testes also produce the male hormone testosterone. Step 3: It is linked with many male changes during puberty.

Step 1: Ovaries are part of the female reproductive system. Step 2: They produce eggs. Step 3: They also help produce female hormones.

Step 1: Sperms are formed in testes. Step 2: They need to reach the passage for release. Step 3: The vas deferens helps transport sperms.

Step 1: An egg is released from the ovary. Step 2: The fallopian tube carries it toward the uterus. Step 3: Fertilization usually occurs in this tube.

Step 1: In self-pollination, pollen remains within the same plant. Step 2: It may reach the stigma of the same flower or another flower of the same plant. Step 3: This is one type of pollination.

Step 1: In cross-pollination, pollen goes from one plant to another plant. Step 2: The other flower belongs to the same species. Step 3: This can increase variation in offspring.