Question

3. Where are the following structures located and what
are their functions?
(a) Thalamus
(b) Stigma
(c) Anther
(d) Placenta
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Answer 1

Answer:

Thalamus- The terminal part of the pedicel is called thalamus or torus or receptacle. It is a condensed axis of the flower from which all floral parts arise.The thalamus is a modified stem as it possesses distinct nodes and internodes. It supplies nutrients to flower just like stems transfer it to leaves. Thalamus is Located at the basal part of flower near the lower stalk of anther.

Stigma-The stigma (plural: stigmas or stigmata) is the receptive tip of a carpel, or of several fused carpels, in the gynoecium of a flower.The stigma is part of the female reproductive part of a flower, the pistil. The stigma is on top of the style. The stigma can be either hairy or sticky, or both to trap pollen. When the pollen lands on the stigma, the pollen will grow a pollen tube down the style, and into the ovary of the pistil.

Anther-The male reproductive part of a flower is called the stamen. It is composed of a long tube, called a filament, and has a pollen-producing structure on the end. This oval-shaped structure is called the anther. It is crucial in the reproduction of flowering plants, as it produces the male gametophyte, known as pollen. The anther consists of the pollen grains. These pollen grains are carried to the stigma by different agents, and the process of reproduction begins.

Placenta-In flowering plants, placentation is the attachment of ovules inside the ovary. The ovules inside a flower's ovary (which later become the seeds inside a fruit) are attached via funiculi, the plant part equivalent to an umbilical cord. The part of the ovary where the funiculus attaches is referred to as the placenta.

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