Photosynthesis is the process required by plants to produce
energy. The process involves absorbing the sunlight and
Photosynthesis is a very important process in maintaining the
levels of oxygen and carbon dioxide.
Carbon dioxide + water -> glucose + oxygen
Photosynthesis takes place in plants cells in small sub units
called chloroplasts which contain a small green pigment
These green pigments help to absorb light and convert light
into energy which can be used by the plant.
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Plants get water from the ground through the roots, and they
gain carbon dioxide from the air as it absorbed through the
leaves. The products of photosynthesis are then released
Adaptations of a leaf
The leaf is a very important part of a plant. The leaf is
important in absorbing sunlight but also exchanging gases
such as carbon dioxide with the air surrounding it.
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A leaf has many parts. The top of the leaf is known as the
waxy cuticle, which protects the leaf and prevents water loss.
The upper part of the leaf is where the sunlight hits. Therefore
the upper part of the leaf has many palisade cells( cells for
photosynthesis) . These palisade cells have many chloroplasts
and look like the plant cell drawn above.
Carbon dioxide enters the plant through small pores in the
leaves called stomata. Guard cells control these pores and
help maintain the conditions within the plant and help it adapt
to the conditions outside for example weather.
The lower part of the leaf cell is called the spongy layer. It has
many gaps, which allows the carbon dioxide to move around
and reach other cells.
Water is absorbed from the ground. The roots have root hair
cells, which are adapted to getting the maximum amount of
water from the ground. There are long and thin , which allows
them to reach the maximum area, also they have very thin
walls thus reducing the diffusion distance for water.
1 – what is the equation for photosynthesis?
2 – which pigment helps to absorb sunlight?
3 – Describe the adaptations of a leaf?
4 – which cell is adapted to absorb sunlight?
5 – which cell is adapted to absorb water?
6 – what is the function of the waxy cuticle?