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Last Updated: Thursday, 30 September, 2004, 16:50 GMT 17:50 UK
Quiz: Species and extinction
Komodo dragon - endangered species, London Zoo
London Zoo's Komodo dragon - see question 10
Scientists warn that human activities may be bringing about the sixth mass extinction of species in the world's history.

As decision-makers discuss the future of the planet's flora and fauna at the 2004 CITES conference in Bangkok, test your knowledge of the web of life.

Question 1
There are an estimated 13-14 million species in the world. How many of those have been recorded and described?
A: 1.75 million
B: 5 million
C: 7 million
D: 11 million
Question 2
What is the biggest threat to species?
A: Habitat loss
B: Hunting, fishing and collecting
C: Alien invasive species
Question 3
How many plant species are used in medicines worldwide?
A: 100 – 200
B: 1,000 – 2,000
C: 10,000 – 20,000
D: 100,000 – 200,000
Question 4
The Rosy Periwinkle is a plant species native to Madagascar. What condition is it used to treat?
A: Kidney stones
B: Heart disease
C: Leukaemia
D: Rheumatism
Question 5
Which country has the most endangered plants in the world?
A: Indonesia
B: Malaysia
C: Ecuador
D: Brazil
Question 6
Wild wheat varieties found in Turkey have a genetic property valued at $US50 million a year. What is it?
A: Resistance to pesticides
B: High levels of vitamin A
C: Resistance to plant disease
D: Twice yearly crops
Question 7
The Sumatran tiger is at risk of extinction. Which everyday product is behind the threat?
A: Hamburgers - the tiger’s rainforest home is being cut down to make way for cattle.
B: Paper – logging companies are exploiting the forests for paper pulp.
C: Toothpaste – workers collecting an ingredient from the sap of a certain tree are disturbing the tigers’ breeding cycle.
D: All of the above are true.
Question 8
What happened when a predatory snail from the US was introduced on the Pacific island of Moorea to control an imported African edible snail?
A: The edible snails’ shells were too tough to crack, so the predatory snails died out.
B: The predatory snail picked up a local disease, which was then carried back to the US in imported goods.
C: Instead of eating the African edible snail, the predator turned on a local species, which is now at risk of dying out.
D: The predatory snail was palatable to a local monkey species, and the sudden abundance of food triggered a population explosion.
Question 9
During the 1990s, by how much was the Earth's forest cover reduced every minute?
A: 0.37 football pitches
B: 3.7 football pitches
C: 37 football pitches
D: 370 football pitches
Question 10
Dinosaurs were wiped out in the mass extinction 65 million years ago - or were they? Which modern day group of animals do many experts say are technically dinosaurs?
A: Crocodiles
B: Komodo dragons
C: Frogs
D: Birds

 Press the button and see how you have done




SEE ALSO:
Oblivion threat to 12,000 species
18 Nov 03  |  Science/Nature
Extinction threat to ancient plant group
04 Jul 03  |  Science/Nature
Species face tough fight for survival
07 Oct 02  |  Science/Nature


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