Plants and photosynthesis Green and growing Photosynthesis is a process in which_________ energy is...
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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