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Achlamydeous flower occurs in
(a) Sunflower
(b) Betel
(c) Onion
(d) Avena

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Answer
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Hint: This flower belongs to the special type of inflorescence which is known as cyathium. This inflorescence looks like a flower while it is naked.

Complete step by step answer:
Achlamydeous flower occurs in Betel. This flower is known for the absence of both the calyx and the corolla called perianth. There is no distinction between petals and sepals.
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So. The correct answer is ‘Betel’.

Additional information:
- Betel that is Piper betle is famous as paan, family Piperaceae.
- Mostly the achlamydeous flowers occur in cyathium inflorescence.
- Cyanthium looks like a single flower and contains glands.
- Each cyathium is actually a flower cluster or inflorescence containing unisexual, apetalous male and female flowers.
- A cup- shaped involucre formed by bracts encloses a single flower and a number of male flowers.
- The female flower is single and centrally placed. It has a pedicle and a tricarpellary pistil with a lobed stigma.
- The male flowers are numerous and are arranged centrifugally. It has a similar pedicle and a single stamen.
- Sunflower shows calyx as pappus and corolla. This has a capitulum type of inflorescence. Capitulum inflorescence is found in the family Compositae.
- Onion has a perianth arranged in two whorls. Umbel type of inflorescence is found in it. Onion belongs to the Alliaceae family.
- Avena has a hypogynous flower. This simple racemose type of inflorescence is found called spikelet. Also, the lemma and palea are present. Avena belongs to the Gramineae family.

Note:
- The arrangement of flowers on the axis is called anthotaxy (anthotaxis).
- Longest inflorescence is found in agave (12m) , Amorphophallus (5.5m).
- Betel chewing is addictive as this stimulates a chemical similar to nicotine.