Nyctinasty refers to the movement or response of plants to the onset of night, often seen in flowers that open in the evening.

रात के समय पौधों की गति

English Usage: The flowers display nyctinasty as they close in response to the fading light.

Hindi Usage: फूल रात के समय की रोशनी कम होते ही बंद होकर नक्ति नास्ती का प्रदर्शन करते हैं।