'Test tube trees':An insurance policy against extinction.

'Test tube trees':An insurance policy against extinction. Source-BBC news

• A tiny oak trees emerges from test tube in the laboratory.
• Raised using technique pioneered in fertility labs, it is the product of new effort to preserve the seeds of wild plants.
• This has been stored in bomb proof,flood proof and radiation proof vaults.
• It aims to save world's plants from extinction.
• The goal is to store atleast 75% of threatened plant seeds by 2020.
• This technique is know as cyropreservation.
• Cryopreservation involves removing the plant embryo from the rest of the seed, then freezing it at very low temperatures in liquid nitrogen. 
• This is invention is done in Kew's Millennium Seed Bank at Wakehurst in West Sussex.