FOTOPERIODISME TUMBUHAN PDF

Gas Beracun Dan Gas Tidak Beracun - Ada beberapa gas pengotor pada udara tambang bawah tanah yang dapat dikelompokan menjadi gas beracun dan gas berbahaya. Gas ini berasal dari proses yang terjadi dalam tambang dan berasal dari batuan maupun bahan galiannya. Gas yang memiliki sifat beracun merupakan gas yang bereaksi dengan darah dan bisa mengakibatkan kematian. Sedangkan gas berbahaya merupakan gas pengotor yang membahayakan kehidupan manusia ataupun bisa mengakibatkan peledakan.

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Photoperiodism is the physiological response of a plant to photoperiod. Vernalization is the process by which flowering due to the cold treatment given to the seed fully hydrated ie, seed absorbs water or to the growing plant. Spesies lain memerlukan fotoperiode selama beberapa hari untuk berbunga, Akan tetapi, tumbuhan yang lain merespon fotoperiode hanya jika sebelumnya dipaparkan ke stimulus lingkungan yang lain, misalnya periode suhu dingin.

Gandum musim dingin, tidak akan berbunga jika belum dipaparkan ke suhu 10 derajat celcius selama beberapa minggu. Beberapa minggu setelah gandum musim dingin divernalisasi, fotoperiode dengan hari yang panjang malam pendek menginduksi perbungaan. The nature of temperature stimulus is as elusive as that of the agent responsible for photoperiodic induction.

When plant are induced to flower by exposure to cold, floral differentiation before the shoot begin to elongate, but when GAS are applied to a cold requiring rosette plant, the first observable response is the elongation of a vegetative shoot followed by the transformation of the apex to floral state.

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