What is a flower? Describe the parts of a typical angiosperm flower.

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(N/A) flower is defined as the reproductive unit of an angiosperm,specialized for sexual reproduction.
$A$ typical flower consists of four distinct whorls arranged on a condensed axis called the thalamus:
$(A)$ Calyx: The outermost whorl consisting of sepals. They are typically green and protect the flower in the bud stage. If sepals are free,it is polysepalous; if fused,it is gamosepalous.
$(B)$ Corolla: The second whorl consisting of petals. They are often brightly colored to attract pollinators. If petals are free,it is polypetalous; if fused,it is gamopetalous.
$(C)$ Androecium: The male reproductive whorl consisting of stamens. Each stamen has a filament and a bilobed anther,where pollen grains are produced via meiosis.
$(D)$ Gynoecium: The innermost female reproductive whorl consisting of one or more carpels. Each carpel comprises an ovary at the base,a style (tube),and a stigma (receptive surface). The ovary contains ovules attached to the placenta.

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The diagram given denotes the various parts of a typical flower. Identify the labelled parts $A$,$B$,$C$,and $D$ and choose the correct option.

$A$ versatile anther is attached to the filament:

Identify $A$ to $E$ in the following diagram.

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A$: $A$ flower is defined as a modified shoot wherein the shoot apical meristem changes to a floral meristem.
Reason $R$: The internode of the shoot gets condensed to produce different floral appendages laterally at successive nodes instead of leaves.
In the light of the above statements,choose the correct answer from the options given below:

Most of the flowering plants produce which type of flowers?

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