Reproduction

Testosterone

Step 1: Testosterone is the primary male sex hormone secreted by the testes during puberty. Step 2: This hormone is responsible for the development of secondary sexual characteristics in boys. Step 3: These characteristics include deepening of voice, growth of facial hair, broadening of shoulders, and muscle development. Step 4: Estrogen and progesterone are female hormones, while oxytocin helps in childbirth. Step 5: Testosterone also plays a role in the production of sperm and the development of male reproductive organs.

Fallopian tube

Step 1: After ovulation, the egg travels from the ovary into the fallopian tube (oviduct). Step 2: If sperm are present, fertilization typically occurs in the fallopian tube. Step 3: The sperm swims up through the vagina, cervix, and uterus to reach the fallopian tube. Step 4: Once fertilized, the zygote travels down the fallopian tube to the uterus for implantation. Step 5: The fallopian tube provides the ideal environment for the sperm and egg to meet and fuse.

Growth of potato from tuber

Step 1: Vegetative propagation is a form of asexual reproduction where new plants grow from vegetative parts like roots, stems, or leaves. Step 2: Potato tubers are modified underground stems that can give rise to new potato plants. Step 3: Each 'eye' on a potato tuber can sprout into a new plant with the same genetic makeup as the parent. Step 4: Seed germination involves sexual reproduction as seeds form from fertilized ovules. Step 5: This method is commonly used by farmers to grow crops like potatoes, ensuring identical plants with desirable characteristics.

Oviparous

Step 1: Oviparous animals are those that reproduce by laying eggs outside their body. Step 2: The embryo develops inside the egg, getting nourishment from the yolk. Step 3: Examples include birds, reptiles, fish, and amphibians like frogs. Step 4: Viviparous animals give birth to live young that develop inside the mother's womb. Step 5: The term 'ovi' comes from 'ovum' meaning egg, making it easy to remember this classification.