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Proximal end of the filament of a stamen is attached to
A) Thalamus or petal
B) Anther
C) Connective
D) Placenta

Answer
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Hint: The stamen is a male reproductive organ of a flower. It produces the pollen. The stamen has two parts: anther and stalk. The stalk is also called a filament.

Complete Answer:
A part of the stem is the basal thickened Thalamus to which all floral appendages are found attached. The colored structural unit of the corolla are Petals to which The ovules are found attached to the region of the wall of the ovary which is known as the placenta. Anther and filament has consisted of a stamen. Anther contains two long and cylindrical microsporangia in its lobes and it is a broad knob part of the stamen. Two anther lobes join together with the middle parenchymatous tissue which is termed as connective tissue.

The filament consists of a stamen which is a stalk and an anther that contains microsporangia. Most commonly anthers are two-lobed and Either at the base or in the middle area of the anther are attached to the filament and most commonly anothers are two-loaded.

Stamens attached to petals are epipetalous. The androecium is collectively the stamens in a flower. The androecium form a great variety of patterns in various species of plants, some of them highly complex.

Hence, The option A: Thalamus or petal is the correct answer.

Note: A flower can have many stamens. A ring inside the ring of petals may be formed with them. The anther is the stalk or filament and the swollen tip. Inside the anther the pollen is made.