IMO Practice Test — Kinds of Plants
6 Questions • 12 min • Olympiad level
12:00
Question 1 of 6
hard
A potted plant's leaves are turning yellow and drooping. It most likely needs…
More darkness
Water and sunlight
Less air
A bigger pot only
Explanation: Yellow, drooping leaves often mean it needs water and light.
Question 2 of 6
medium
How do plants help keep our air clean?
They make smoke
They take in bad air and give out oxygen
They eat dust only
They do nothing
Explanation: Plants take in carbon dioxide and give out oxygen.
Question 3 of 6
hard
What is the main way we tell trees, shrubs and herbs apart?
The day they grow
Their colour only
Their smell only
Their size and how woody the stem is
Explanation: We sort them by size and stem type.
Question 4 of 6
hard
Why are most herbs grown afresh each season?
They are made of wood
They have short lives with soft stems
They never die
They are very tall
Explanation: Soft-stemmed herbs are short-lived and re-grown.
Question 5 of 6
medium
Why does a climber need a stick or wall?
To hide
It likes the colour
Its weak stem needs support to rise up
It does not need one
Explanation: A climber's weak stem needs support to climb.
Question 6 of 6
hard
Why do gardeners add manure or compost to soil?
It removes water
It dries the soil
It blocks sunlight
It feeds the plant with nutrients
Explanation: Manure adds nutrients that help plants grow.