Soft Wool

The soft wool signify internal archery target i.e soft female ovum during process of weak fertilisation.

Fertilisation is the biological process in sexual reproduction where a male gamete (sperm) fuses with a female gamete (egg) to form a single-celled zygote. This event combines the genetic material from both parents, restoring the normal chromosomal number and initiating the development of a new, genetically unique offspring. [1, 2, 3, 4]

Key Concepts in Human Fertilisation

• The Journey: Out of millions of sperm released during ejaculation, only a few hundred successfully navigate the female reproductive tract to reach the egg in the fallopian tube. [1]

• The Fusion: The sperm penetrates the outer layers of the egg (the corona radiata and zona pellucida) using enzymes released from its acrosome. [1, 2]

• The Block: As soon as a single sperm fuses with the egg's membrane, the egg alters its outer surface to prevent other sperm from entering. [1, 2]

• The Zygote: The nuclei of the sperm and egg merge, establishing a full set of 46 chromosomes. This single cell is called a zygote and immediately begins dividing as it travels to the uterus. [1, 2, 3, 4]

Variations in Reproduction

• In-Vitro Fertilisation (IVF): A clinical process where an egg and sperm are combined outside the body in a laboratory dish.

• Double Fertilisation: A unique process in flowering plants (angiosperms) where one male gamete fertilises the egg, and a second fuses with two polar nuclei to form the endosperm.

Fertilisation in flowering plants is the crucial process where male and female gametes fuse to produce a diploid zygote, which eventually develops into a plant embryo. This biological mechanism occurs sequentially: [1, 2, 3]

1. Pollination: Pollen grains (male gametes) land on the sticky female surface called the stigma.

2. Germination: The pollen grain grows a slender tube down through the style toward the ovary.

3. Penetration: The pollen tube enters the ovule (which contains the egg cell) via a tiny pore.

4. Fertilization: The male nucleus fuses with the female ovule nucleus. In most flowering plants, this is a "double fertilisation" process: one sperm fertilizes the egg (forming the embryo), and another fuses with polar nuclei to create the endosperm (a food store for the seed.