Plant Organs 01
The energy for photosynthesis to take place in these leaves comes from sunlight.

Plant Organs 01

The scientific study of plants is known as botany and a person studying plants a botanist. The scientific study of plants really began in 1753 when a Swedish scientist, Carl Linneaus, published a book in which he classified plant species based on their reproductive organs. Nowadays, similar keys based on plant organs are still used to identify plants, you will probably have learnt about these in your science lessons.

Organs are cells and tissues that are grouped together in a certain way in order to carry out a specific function (job) in the plant. The four main plant organs allow the seven life processes to take place - they are the roots, stem, leaves and flower. Each of these has several jobs to do. The flower attracts the insects needed for pollination but also contains the plant's organs of sexual reproduction. The stem supports the leaves and flowers and allows water and nutrients to be transported through the plant. The leaves are the organs of photosynthesis and the roots keep the plant anchored in place and absorb the water and nutrients required for the plant to stay alive.

See how much you do know about plants in the following Science quiz.

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  1. What colour is chlorophyll?
    It is why most plants look green
  2. Which two substances are produced in photosynthesis?
    Oxygen leaves through the stomata
  3. Which two substances are used in photosynthesis?
    Carbon dioxide enters through stomata (small holes) on underside of a leaf
  4. Energy for photosynthesis comes from .......
    When plants don't get enough light, they can't make enough food and they become weakened and can die
  5. Nitrates provide nitrogen. This is important for what?
    Nitrates are also used to make proteins for growth
  6. Photosynthesis does not occur in roots because .......
    They are usually underground organs so little or no light reaches them anyway
  7. Which organ is used in photosynthesis?
    Photosynthesis means making (synthesis) through light (photo)
  8. Which organ is used to absorb water?
    96% of a cucumber is water
  9. Which organ is used in pollination?
    Flowers often contain nectar and some give off a scent in order to attract insects
  10. Plants make their own food. This is stored as what?
    You can test for starch in a leaf by using iodine

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