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

Plant Organs 01

This KS3 Science quiz takes a look at plant organs. 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.

1.
Which two substances are produced in photosynthesis?
Carbon dioxide and water
Glucose and carbon dioxide
Oxygen and carbon dioxide
Oxygen and glucose
Oxygen leaves through the stomata
2.
Which two substances are used in photosynthesis?
Carbon dioxide and oxygen
Carbon dioxide and water
Oxygen and glucose
Oxygen and water
Carbon dioxide enters through stomata (small holes) on the underside of a leaf
3.
Which organ is used to absorb water?
Leaf
Root hair
Root tip
Stem
96% of a cucumber is water
4.
Which organ is used in pollination?
Flower
Leaf
Root
Stem
Flowers often contain nectar and some give off a scent in order to attract insects
5.
Nitrates provide nitrogen. This is important for what?
Good roots
Green leaves
Purple flowers
Yellow flowers
Nitrates are also used to make proteins for growth
6.
Energy for photosynthesis comes from .......
Glucose
Oxygen
Sunlight
Water
When plants don't get enough light, they can't make enough food and they become weakened and can die
7.
What colour is chlorophyll?
Brown
Green
Red
White
It is why most plants look green
8.
Photosynthesis does not occur in roots because .......
Root hair cells absorb water
Root hair cells do not have chloroplasts
Roots anchor plants in soil
Roots are used to transport water
They are usually underground organs so little or no light reaches them anyway
9.
Plants make their own food. This is stored as what?
Fat
Glucose
Protein
Starch
You can test for starch in a leaf by using iodine
10.
Which organ is used in photosynthesis?
Flower
Leaf
Root hair
Root tip
Photosynthesis means making (synthesis) through light (photo)
Author:  Sue Davison

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