define the terms and functions of each first aerenchyma, karyokinesis, tonoplast ,endosperm,placentation
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1. Aerenchyma is a spongy tissue that forms spaces or air channels in the leaves, stems and roots of some plants, which allows exchange of gases between the shoot and the root.
2. Karyokinesis: During cell division, the process of partition of a cell's nucleus into the daughter cells.
3.A tonoplast is actually the membrane that surrounds the large vacuole in a mature plant cell.
4.The endosperm is a tissue produced inside the seeds of most of the flowering plants following fertilization. It is triploid (meaning three chromosome sets per nucleus) in most species.[1] It surrounds the embryo and provides nutrition in the form of starch, though it can also contain oils and protein.
5. the formation or arrangement of a placenta or placentae in a woman's or female animal's uterus.