Question

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

Answer 1

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.

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.