Reproduction

Step 1: Reproduction produces new organisms of the same kind. Step 2: It helps maintain the species. Step 3: In exams, connect reproduction with continuity of species.

Step 1: Asexual reproduction forms offspring from one parent. Step 2: It does not involve fusion of male and female gametes. Step 3: So the offspring are very similar to the parent.

Step 1: Sexual reproduction forms two types of gametes. Step 2: Male and female gametes fuse to form a zygote. Step 3: This fusion is the key feature of sexual reproduction.

Step 1: In binary fission, one cell divides into two parts. Step 2: This method is commonly seen in Amoeba. Step 3: Therefore, Amoeba is the correct example of binary fission.

Step 1: In budding, a small bud forms on the parent body. Step 2: This bud can grow into a new organism. Step 3: Hydra is an easy example of budding.

Step 1: Spirogyra has a filament-like body. Step 2: This body can break into separate fragments. Step 3: Each fragment can grow into a new Spirogyra.

Step 1: In regeneration, a body part can form a new organism. Step 2: Small pieces of Planaria can grow into new organisms. Step 3: Therefore, Planaria is a well-known example of regeneration.

Step 1: Vegetative propagation can form a new plant without seeds. Step 2: Parts like root, stem, or leaf can form new plants. Step 3: It is a method of asexual reproduction in plants.

Step 1: Buds form on the leaf margins of Bryophyllum. Step 2: These buds can separate and form new plants. Step 3: This is an easy example of vegetative propagation.

Step 1: A flower may have male and female reproductive parts. Step 2: The stamen produces pollen grains. Step 3: Therefore, the stamen is the male part of a flower.

Step 1: The female part of a flower is called the pistil. Step 2: It includes stigma, style, and ovary. Step 3: Ovules are present inside the ovary.

Step 1: The stamen is the male part of the flower. Step 2: Pollen grains are formed in the anther of the stamen. Step 3: Pollen grains are linked with male reproductive cells.

Step 1: Pollen grains are formed in the anther. Step 2: Pollination occurs when they reach the stigma. Step 3: Pollination occurs before fertilization.

Step 1: The male gamete reaches the egg through the pollen tube. Step 2: Male and female gametes fuse. Step 3: This fusion forms a zygote.

Step 1: Ovules are present inside the ovary. Step 2: After fertilization, the ovule develops. Step 3: The developed ovule becomes a seed.

Step 1: The pistil of a flower contains the ovary. Step 2: After fertilization, the ovary grows. Step 3: It develops into a fruit.

Step 1: A seed contains a small embryo. Step 2: Under suitable conditions, the seed germinates. Step 3: After germination, a new plant forms.

Step 1: A seed needs water to become active. Step 2: Air is needed for respiration and suitable temperature for growth. Step 3: With these conditions, a seed can germinate.

Step 1: The male reproductive cell in humans is called sperm. Step 2: It is produced in the testes. Step 3: Sperm fuses with the egg to form a zygote.

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.