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Last updated at 15:26 GMT, Friday, 10 December 2010

Seeds

picture of greenhouse at Kew Gardens, London

Researchers from the Royal Botanic Gardens at Kew are collecting seeds

In this programme, Rob and Yvonne are talking about seed banks – a place where the seeds from all kinds of plants are carefully stored. Unfortunately, researchers are warning that about one fifth of the world's plants are at risk of becoming extinct.

This week's question:
The Youtan Poluo is one of the rarest flowers and was recently found by a farmer in China.

How often does it bloom? Is it every:

a) 1,000 years

b) 3,000 years

c) 5,000 years

Listen out for the answer in the programme.

Listen

Seeds

End of Section

Vocabulary

extinct

doesn't exist anymore

bloom

flower or open up

species

different groups of plants or flowers. (It can also refer to groups of animals)

agriculture

farming

urban centres

areas such as cities or towns where large numbers of people live, work and shop

plant biodiversity

wide variety of plants that support a balanced environment

botanical experts

people with specialist knowledge of flowers, plants and trees

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