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Plants and Photosynthesis. How do plants make their own food?. Plants make their food from carbon dioxide and water in a chemical reaction called... photosynthesis . carbon dioxide (from the air). glucose. oxygen. water (from the soil).

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Presentation Transcript
how do plants make their own food
How do plants make their own food?

Plants make their food from carbon dioxide and water in a chemical reaction called...


carbon dioxide

(from the air)




(from the soil)

The food made by photosynthesis is the sugar glucose.

Oxygen gas is also made as a by-product of photosynthesis.

how do plants grow
How do plants grow?

Plants need energy for photosynthesis to take place.

Where does this energy come from?

light energy

carbon dioxide

(from the air)




(from the soil)

The energy for photosynthesis comes from the Sun.

Where in a plant does photosynthesis take place?

how do plants grow1
How do plants grow?

Plant cells in the upper surface of leaves have chloroplasts which contain the green pigment called chlorophyll.

light energy


carbon dioxide

(from the air)




(from the soil)

It is chlorophyll that absorbs light energy from the Sun

to make photosynthesis happen.

photosynthesis summary
Photosynthesis summary

Plants make their own food by the process of photosynthesis.

In this chemical reaction, chlorophyll in plant cells absorbs light energy to change carbon dioxide and water into glucose and the by-product oxygen.

What is the word equation for photosynthesis?

light energy







This equation can be read as:

“carbon dioxide and water, in the presence of light energy

and chlorophyll, produces glucose and oxygen”.

how about at night
How about at night?


Carbon dioxide



Glucose + oxygen  carbon dioxide + water (+energy)

how are leaves adapted
How are leaves adapted?

Leaves are small ‘factories’ that produce food for plants

by photosynthesis.

Leaves are adapted so that photosynthesis can take place.

Plants need carbon dioxide, water, sunlight and chlorophyll to carry out this important process.

What features of leaves

make them suitable for photosynthesis?

how are leaves adapted1
How are leaves adapted?

The features of leaf that make it suitable for photosynthesis are:

  • A leaf is broad and flat to capture lots of sunlight.
  • carry water to the leaf and take food from the leaf

to the rest of the plant. Veins

also help to support the leaf.

  • Certain plant cells contain chloroplasts with chlorophyll.
  • Small holes called stomatain the underside of a leaf allow gases in and out.
  • Veins
how does water enter a plant
How does water enter a plant?

Water is one of the raw materials needed for plants to carry out photosynthesis.

How does water enter a plant?

Water from the soilenters a plant through the roots.

You can’t normally see them but

roots are a very important part of a plant.

Why are roots branched and spread out through the soil?

water movement inside the plant
Water movement inside the plant
  • Xylem is responsible for the transportation of water.
  • Phloem is responsible for the transportation of glucose (sugar).
how are roots adapted


How are roots adapted?
  • Roots are branched and spread out
  • for two reasons:
  • to absorb water (and mineral salts)

from a large amount of soil.

  • to anchor the plant in the soil.
  • Taking a closer look, roots are
  • covered in root hair cells.
  • Root hair cells have thin walls
  • and a large surface area to help
  • them absorb lots of water.
  • How are roots adapted to their job?
draw a table in your books
Draw a table in your books…

Angiosperms (Flowering plants)

draw a table in your books1
Draw a table in your books…

Angiosperms (Flowering plants)

flower challenge
Flower challenge
  • Dissect your flower.
  • Is it a monocot or a dicot?
  • How do you know?

In your books, you need to:

1. Draw and label your flower.

2. Describe the features of the flower.

3. Is it a monocot or a dicot? Explain how you know.

4. Have a look at some of the pollen under the microscope. Draw it.

answer these questions in your books
Answer these questions in your books…
  • How many acorns grow into a mature tree?
  • What anchors the tree?
  • What do fallen leaves do?
  • What does pruning do?
  • Trees can grow to around _________ years old.
plant profile
Plant profile
  • Pictures of
    • Plant
    • Flower (labelled parts)
    • Pollen
    • Region where it’s found.
  • Information about
    • Where it’s found
    • Name + scientific name
    • Dimensions
    • Leaves
    • Lifecycle including…
      • Flowering information including pollen
      • Seed dispersal information
  • Presentation style;
  • Poster
  • Written document
  • Powerpointpresentation
  • video
  • Animation
  • song


Is it a monocot, dicot or non-flowering plant?

Does it have medicinal value?

Who discovered it/ named it? When?

Full sentences please!!!!