Unit 2, Feeding the billions, Biology Flashcards
State what is happening to the human population explain why this could be a problem.
The population is increasing so food has to be grown but there is limited land.
Suggest methods to produce more food in the world.
Irrigation Green houses Mechanical farming Plant rotation Animals Basic foods and less cash crops Eating more vegetables
Name the raw materials for photosynthesis.
water
carbon dioxide
Name requirements for photosynthesis.
sunlight
chlorophyll
Their products of photosynthesis.
glucose
oxygen
Right equation for photosynthesis.
water + carbon dioxide -> glucose + oxygen
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sunlight ] [ chlorophyll
Describe what the main product of photosynthesis can be used for.
energy
cellulose
starch (storage)
In the indicator used to test for starch and describe the colour change.
iodine solution
brown - no chlorophyll
blue/black - chlorophyll
Explain each stage in the “testing a leaf for starch” process.
cut a leaf tissue
boil the leaf in water ( 2 mins )
boil leaf in ethanol
wash the alcohol off the leaf with cold water
put leaf on dimple plate with iodine solution
take leaf out and observe
The green pigment found in leaves.
chlorophyll
Explain the role of chlorophyll in photosynthesis.
to absorb light
Name that cells/structures found in leaves.
Upper epidermis wax cuticle pallisade mesophyll mesophyll spongy mesophyll lower epidermis guard cell with chloroplast stomata
Explain how the cuticle of a plant help plants photosynthesise.
waterproof coating
Explain how the upper epidermis help plants photosynthesise.
protective outer layer
Explain how the palisade mesophyll cells help plants photosynthesise.
contain the most chlorophyll and where photosynthesis occurs
Explain how the spongy mesophyll cells help plants photosynthesise.
absorbs extra sunlight and creates ear spaces
Explain how the air spaces help plants photosynthesise.
Allows air/gases to and from photosynthesising cells
Explain how the xylem vessel help plants photosynthesise.
hollow tube allowed passage of water
Explain how the stomata helps plants photosynthesise.
Hole in epidermis that allows gasses in/out of the leaf.
Explain how the guard cells help plants photosynthesise.
open/close stomata
State whether the upper or lower epidermis as the most stomata.
lower
State what a limiting factor is.
If a factor needed for photosynthesis is in short supply and is limiting the photosynthesis rate
Name the factors which may limit photosynthesis in plants.
Temperature
Carbon dioxide concentration
Light intensity
States several practical measurements of photosynthesis that can be made.
volume of oxygen per minute
mass of glucose produced per day
volume carbon dioxide uptake per min
Name three elements required for healthy plant growth.
Nitrogen (N)
Phosphorus (P)
Potassium (K)
Describe the symptoms of plant growth without phosphorus.
poorly developed roots
overall growth reduced
Describe the symptoms of plant growth without nitrogen.
long thin roots
small yellow leaves
growth reduced
Describe the symptoms of plant growth without potassium.
poorly developed flower
growth reduced
