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.

The food made by photosynthesis is the sugar glucose.Oxygen gas is also made as a by-product of photosynthesis.

oxygen

glucosecarbon dioxide (from the air)

water (from the soil)

How do plants grow?Plants need energy for photosynthesis to take place. Where does this energy come from?

The energy for photosynthesis comes from the Sun.Where in a plant does photosynthesis take place?

oxygen

glucosecarbon dioxide (from the air)

water (from the soil)

light energy

How do plants grow?Plant cells in the upper surface of leaves have chloroplasts which contain the green pigment called chlorophyll.

oxygen

glucosecarbon dioxide (from the air)

water (from the soil)

light energy

It is chlorophyll that absorbs light energy from the Sun to make photosynthesis happen.

chlorophyll

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?

glucose

light energy

chlorophyll

carbondioxide water oxygen

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?

oxygenCarbon dioxide

water

Respiration

Glucose + oxygen carbon dioxide + water (+energy)

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?

http://australia.twig-world.com/films/parts-of-the-plant-leaves-1181/

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 stomata in the underside of a leaf allow gases in and out.

Veins

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 soil enters 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

• Xylem is responsible for the transportation of water.

• Phloem is responsible for the transportation of glucose (sugar).

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?

water

Water and sugar in plants

Flowering plants

Pollen

Draw a table in your books…

Features Monocot Dicot

Petals

Veins

Roots

Stem

Angiosperms (Flowering plants)

Monocot or a dicot?

Draw a table in your books…

Features Monocot Dicot

PetalsMultiples of 3 Multiples of 4 or 5

VeinsParallel veins Net veined

Roots Branching, adventitious roots Tap root

Stem Vascular bundles scattered around

Vascular bundles near the edge of the stem

cotyledon1 multiple

Angiosperms (Flowering plants)

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…

• 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• 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- Powerpoint presentation-video-Animation-song Full sentences please!!!!

Bonus:Is it a monocot, dicot or non-

flowering plant?Does it have medicinal value?

Who discovered it/ named it? When?