Upgraded B002 Ntbi0204 Precise Sequence Outcomes Double — a labelled NEET Biology diagram with a definitions lexicon.
Diagram illustrating the precise sequence and outcomes of double fertilization. Labelled parts: Double Fertilization, Cross-section, Fertilization, Reproductive, Pollen tube, Angiosperm, Endosperm, Micropyle, Nucleus, Ovules, Petals, Ovary, Ovule, Seeds, Sepal. A unique mechanism in flowering plants involving syngamy (egg + sperm) and triple fusion (polar nuclei + sperm). A diagrammatic view of an organ or tissue obtained by cutting it at a right angle to its longitudinal axis. FYI: Transverse sections (T.S.) are standard in plant anatomy to study the arrangement of vascular bundles. The process where a haploid male gamete (sperm) fuses with a haploid female gamete (ovum) to form a diploid zygote. This restores the species' characteristic chromosome number. FYI: The formation of the zygote marks the beginning of the embryonic development, and the initial mitotic divisions are called cleavage. The segment of a population composed of individuals who are currently capable of producing offspring. FYI: The size and health of this group directly determine the current birth rate of the population. A tubular extension of the pollen grain that transports male gametes through the style to the ovule. FYI: Its growth is chemotropic, guided by chemicals secreted by the synergids. Vascular plants that produce seeds enclosed within a fruit (ovary). FYI: Angiosperms are the most evolutionarily advanced group of plants and are responsible for the vast diversity of flowering plants. A tissue produced inside the seeds of most flowering plants that provides nutrition to the embryo. A small opening in the integuments of an ovule through which the pollen tube enters. FYI: In seeds, it remains as a small pore to facilitate water and oxygen entry during germination. A membrane-bound organelle in eukaryotic cells that contains the genetic material in the form of chromatin and coordinates cellular activities. FYI: The nucleolus within the nucleus is the specific site for the synthesis of ribosomal RNA (rRNA). Ovules are structures located inside the ovary that contain the female gametophyte (egg cell). They are the precursors to seeds. FYI: Pollination leads to the fertilization of the ovule, and the mature ovule develops into a seed. The bright, leaf-like structures of a flower that collectively form the corolla. FYI: Their primary function is to attract pollinators through color and scent. The ovary is the swollen, basal part of the gynoecium that contains one or more ovules. After fertilization, the ovary develops into the fruit. FYI: The type of ovary (e.g., superior or inferior) is a key feature used in plant taxonomy. The integumented megasporangium of a seed plant that contains the female gametophyte and develops into a seed after fertilization. FYI: The ovule is attached to the placenta by a stalk called the funicle and the junction is called the hilum. The ripened and fertilized ovules containing an embryo and stored food for future growth. FYI: Seeds are the final product of sexual reproduction in Spermatophytes (gymnosperms and angiosperms). The outermost green leaf-like structures of a flower that protect the floral bud before it opens. FYI: Collectively, the sepals are known as the calyx.