Reproduction

Step 1: Potato is a modified stem. Step 2: Its eyes contain buds. Step 3: Under suitable conditions these buds can form new plants.

Step 1: Stamen is the male part of a flower. Step 2: The anther is present at its upper part. Step 3: Pollen grains are formed in the anther.

Step 1: Pistil is the female part of a flower. Step 2: It has stigma at the top, style in the middle, and ovary at the base. Step 3: This order helps understand flower structure.

Step 1: In pollination, pollen grains reach the stigma. Step 2: In fertilization, male and female gametes fuse. Step 3: Therefore pollination occurs before fertilization.

Step 1: A pollen grain germinates on the stigma. Step 2: A pollen tube grows from it. Step 3: The pollen tube carries the male gamete to the egg in the ovule.

Step 1: Ovule is present inside the ovary. Step 2: After fertilization, the ovule develops into a seed. Step 3: At the same time, the ovary grows into a fruit.

Step 1: Self-pollination uses pollen from the same plant. Step 2: Cross-pollination uses pollen from another plant of the same species. Step 3: This changes the genetic combination and can increase variation.

Step 1: Wind can carry pollen from one flower to another. Step 2: Light pollen grains spread easily in air. Step 3: Therefore light pollen is useful in wind pollination.

Step 1: Some flowers are colorful to attract insects. Step 2: Insects may carry pollen on their bodies while visiting flowers. Step 3: This can transfer pollen to the stigma of another flower.

Step 1: Sperms are produced in testes. Step 2: Sperm formation needs a temperature slightly lower than normal body temperature. Step 3: The external sac helps maintain this temperature.

Step 1: Sperm has to reach the egg. Step 2: Its tail helps it move through fluid. Step 3: Therefore the tail is linked with the chance of fertilization.

Step 1: Sperms are formed in testes but need fluid to move. Step 2: Accessory glands produce this fluid. Step 3: This fluid supports sperm nutrition and movement.

Step 1: Ovary is a main organ of the female reproductive system. Step 2: It produces eggs. Step 3: It also produces female hormones that help body changes.

Step 1: Egg enters the fallopian tube after release from ovary. Step 2: Sperm can also reach this tube. Step 3: Therefore fertilization usually occurs in the fallopian tube.

Step 1: The uterine lining prepares during each cycle. Step 2: If fertilization occurs, the embryo implants in this lining. Step 3: This lining supports early nourishment and protection.

Step 1: The uterine lining thickens to prepare for pregnancy. Step 2: If fertilization does not occur, no embryo implants. Step 3: The lining breaks down and leaves as blood and tissue.

Step 1: The embryo depends on the mother for food and oxygen. Step 2: The placenta allows exchange of materials between mother and embryo. Step 3: It also helps remove wastes from the embryo.

Step 1: After fertilization, the zygote divides to form an embryo. Step 2: The embryo attaches to the uterine wall. Step 3: This attachment is called implantation.

Step 1: Many changes occur during adolescence. Step 2: These changes occur under the influence of hormones. Step 3: Hormones play a major role in maturation of reproductive organs.

Step 1: Sperm must move to reach the egg. Step 2: So it is small and has a tail. Step 3: The egg is larger and has more cell material for early development.