Question

Write the procedure of opening and closing of petals in dandelion
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Answer 1

Answer:

Procedure of opening and closing of petals in dandelion:

• The procedure of “opening and closing of petals” in dandelion flowers is called nyctinasty or sleeping movements.
• The dandelion (Taraxacum officinale) flowers are bright yellow-coloured ray flowers that open in the morning and close in the night.
• Nyctinasty refers to the movement or closing of leaves or petals of a flower during the night or in response to changes in light, temperature, and humidity of the external environment and the movement of the “internal circadian clock”.
• At the dawn, with increased temperature, the interior inflated cells with water push open the petals due to increased water turgor.
• In the night, internal cells deflate and petals close.  This movement is to protect the pollens from getting wet in the night dew.

Answer 2

Answer:

The petals of dandelion flower open during the day time and close at the dark night time.

Explanation:

Dandelions are nyctinastic flowers that are seen to possess sleeping movements. These flowers open their petals during the bright sunlight in the day time, whilst they close their petals at dark night time. Nyctinastic flowers are those flowers that move in response to changes in light. At times, a drop or rise in temperature or humidity is also seen to trigger response in these flowers, to open or close their petals.