2. PLANT NUTRITION
• 1. How Plants make their own food
• 2. How plants get nutrients
• 3. Photosyntesis
• 4. The distribution of elaborated sap
• 5. Plant respiration
• 6. Growth, movement and the perception of time.

3. 1. How plants make their own food
• Plants and animals are all living things, but
they obtain food in different ways.
• Animals eat other living things, but plants
make their own food.

4. 1. How plants make their own food.
• Plants need air, water and mineral salt to
make their food.

5. 1. How plants make their own food.
• They use sunlight as their source of energy.
• This process is called photosynthesis.

6. 1. How plants make their own food.
• All plants are Autotrophs. Autotrophs are
organisms that make their own food.

7. 2. How plants get nutrients.
• Water and mineral salts are very important for
plant nutrition.
• Mineral salts from the soil dissolve in water.
• Plants absorb water from the soil trough their
tiny root hairs.

8. 2. How plants get nutrients.
• The mixture of water and
mineral salts, called Raw
Sap, travels up the stem
to the leaves through long
tubes, called Xylem
Vessels.
• Carbon dioxide enters a
plant throught tiny pores
called Stomata, situated
on the underside of the
plant´s leaves.
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9. 3. Photosynthesis.

10. 3. Photosynthesis.
• Photosynthesis is a complex chemical process.
• It enables plants to manufacture food from
water, mineral salts, carbon dioxide and
sunlight.

11. 3. Photosynthesis.
• Chlorophyll is a green
substance which traps
sunlight.
• It is found in special
organelles called
chloroplasts which are
inside plant cells.
• Cholorophyll gives
plants their green
colour.

12. 3. Photosynthesis.
• Sunlight is essential for
photosynthesis, so the
process can only take place
during the day.
• In the leaves, the raw sap
mixes with carbon dioxide
and becomes elaborated
sap: the plant´s food.
• Plants release oxygen as a
waste product of
photosynthesis.

13. 3. Photosynthesis.

14. 3. Photosynthesis.

15. 4. The distribution of elaborated sap.
• Elaborated sap is made when
raw sap mixes with carbon
dioxide.
• This food is distributed from
the leaves to all parts of the
plant through tubes called
Phloem vessels.
• This distribution is very
important because
photosynthesis does not take
place in all parts of the plant.
• Phloem vessels are separated
from xylem vessels, so that
raw sap elaborated sap do not
mix.

16. 4. The distribution of elaborated sap.

17. 5. Plant Respiration.
• Plants need to breathe. They
take in oxygen from the air
and give off carbon dioxide.
• Plants combine oxygen with
nutrients to obtain energy.
This gas exchange is called
Respiration.
• During photosynthesis, the
opposite ocurs. Plants take in
carbon dioxide and give off
oxigen.
• However, plants produce more
oxygen than they can use. As a
result, forests are an
important source of oxygen.

18. 5. Plant Respiration.

19. 6. Growth, movement and the
perception of time.
• All plants have sensitivity: they react to
changes in the enviroment.

20. 6. Growth, movement and the
perception of time.
• Roots always grow downwards, and
stems always grow upwards, even if the
ground is sloping.
• Stems and leaves grow towards light.
• Vines, such as grapevines, wrap
themselves round a support and grow
along it.
• The mimosa plant is capable of rapid
movement: Its leaves close if you touch
it.
• Plants can distinguis the seasons by the
number of hours of daylight and
darkness. Days get longer and nights get
shorter in spring when plants normally
grow flowers.

21. 6. Growth, movement and the
perception of time.

22. ANY QUESTIONS???
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VIDEO ABOUT
PHOTOSYNTHESIS
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