AP BIOLOGY

Detailed explanation-1: -It stores food and has the potential to develop into a new plant under optimal conditions. Fertilization is the process of fusion of male gamete and female gamete to form a zygote. Pollen grains are transferred to stigma by various pollinating agents such as water, wind, butterflies, insects, animals, birds, etc.

Detailed explanation-2: -Seeds are fertilised, mature ovules-the result of sexual reproduction in plants. Not all plants produce seeds, but those that do often rely on these seeds to replicate themselves over successive seasons and years. Seeds are of immense biological and economic importance.

Detailed explanation-3: -Seed dispersal promotes the survival of plant species. It allows plants to unfold in an extensive area. Thus, preventing plants from competing for light, water, and nutrients from the soil, which occurs when plants grow closer to each other.

Detailed explanation-4: -In flowering plants, haploid gametes-an egg cell and a sperm cell fuse to form the first diploid cell-the zygote. The zygote is the progenitor stem cell that gives rise to all the embryonic and post embryonic tissues and organs.

Detailed explanation-5: -Seeds are the products of ripened ovule. Seeds contain two cotyledons or a single cotyledon as in cereals which help in providing food to the embryo (baby plane). These cotyledons are enclosed within the seed coat which also acts as a protective layer. On germination, seeds give rise to new baby plant.