Plants and photosynthesis

Green and growing

Photosynthesis is a process in which_________ energy is used to make_____________

Plants and photosynthesis

The site of photosynthesis is in the _______

Chloroplast contain the pigment________

Chlorophyll absorbs colors of light and reflects only_____, this why leaves are _______

WORD LIST:

chlorophyll

chloroplast, green

photosynthesis

WORD LIST

carbon dioxidewatersunlightoxygenglucose

Plants and photosynthesis

carbon dioxidefrom the air

waterfrom soil

photosynthesis

oxygen

glucose

some oxygen and glucose used in respiration

fats and oils for storage

Photosynthesis

light energy taken in

water+ sugar+

How fast does a plant photosynthesise? This question is very important to farmers and growers.

We can use this apparatus to measure the rate of photosynthesis. How?

We might count the oxygen bubbles per minute, or collect the gas given off in one minute and measure its volume.

What would happen if we increased the light level?

light source

oxygen collects

test tubewater

pondweed (Elodea)

beaker

funnel

Here are some results from the pondweed experiment.

What effect does light have on the rate of photosynthesis?

light level bubbles of oxygen per minute

very high 24

high 22

medium 15

low 7

very low 0

________________________

Without light energy, the reactions of photosynthesis cannot work.

TRUE!

1. Photosynthesis only happens in the light.2. Plants make food from oxygen and sunlight.3. Photosynthesis and respiration work in opposite directions.

4. Plants look green because they contain the chemical chlorophyll.

5. Roots carry out half the photosynthesis that takesplace in a healthy oak tree.

6. Plants give out carbon dioxide when they arephotosynthesising.

True or false?

They take in carbon dioxide. Oxygen is produced by photosynthesis.

FALSE!Photosynthesis produces glucose and oxygen, while respiration breaks them down to make carbon dioxide and water.

TRUE!Chlorophyll absorbs all the colours in light except green – we see the green light because it is reflected from the plant.

TRUE!They are vital to the plant but roots cannot carry out photosynthesis – they’re underground in the dark.

FALSE! Plants need carbon dioxide from the air and water from the soil to build sugars. Oxygen is produced in photosynthesis. 

FALSE!

WATER CYCLE

How do plants contribute to the water cycle ?

___________________________

NITROGEN CYCLE

How do plants contribute to the Nitrogen cycle ?

_________________________

How do plants contribute to the carbon cycle ?

_______________________

CARBON CYCLE