2475887
Descripción
Mapa Mental por Lilac Potato, actualizado hace más de 1 año
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Creado por Lilac Potato
hace más de 9 años
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GCSE AQA Biology 2 Plants & Photosynthesis
- Plant tissues & organs
- Organs in a plant...
- Stem
- Roots
- Leaves
- Stem
- Tissues in a leaf...
- Mesophyll - where most of
photosynthesis happens
- Xylem & phloem - transport
water, mineral ions & sucrose
- Epidermal -
covers the plant
- Mesophyll - where most of
photosynthesis happens
- Organs in a plant...
- Photosynthesis equation
- How photosynthesis works
- Photosynthesis produces 'food' - glucose
- Happens inside chloroplasts
- Chloroplasts contain chlorophyll which
absorbs sunlight & uses its energy to...
- Convert carbon dioxide and water into
glucose, oxygen is produced as by-product
- Convert carbon dioxide and water into
glucose, oxygen is produced as by-product
- Chloroplasts contain chlorophyll which
absorbs sunlight & uses its energy to...
- Happens in the leaves of all green plants
- Photosynthesis produces 'food' - glucose
- The rate of
photosynthesis
- Affected by
3 factors...
- Light
Nota:
- Provides energy needed for photosynthesis
- Too little slows down rate
- As light level increased, rate
increases steadily up to certain point
- Past that point, increasing
light levels further won't
make any difference
Nota:
- Carbon dioxide or temperature has become a limiting factor
- Past that point, increasing
light levels further won't
make any difference
- Carbon dioxide
Nota:
- One of the raw materials needed for photosynthesis
- Too little slows
down rate
- Increasing levels will
only increase rate up
to certain point
- After that, carbon dioxide
is no longer limiting factor
- After that, carbon dioxide
is no longer limiting factor
- Temperature
Nota:
- Has to be right
- If temp. is limiting -
usually because too low
- Enzymes needed work
more slowly at lower temp.
- Enzymes needed work
more slowly at lower temp.
- If plant is too hot -
enzymes denatured
Nota:
- Happens at about 45 degrees C
- Light
- Affected by
3 factors...
- Creating the ideal conditions for growing crops in a greenhouse
- Heat
- Greenhouses trap Sun's
heat - temp. isn't limiting
- In winter, farmers
might use heaters
- In summer, farmers might
use shades and ventilation
- Greenhouses trap Sun's
heat - temp. isn't limiting
- Light
- Supply artificial light at night
- Supply artificial light at night
- Carbon dioxide
- Use paraffin heaters to heat
greenhouse - makes carbon
dioxide as by-product
- Use paraffin heaters to heat
greenhouse - makes carbon
dioxide as by-product
- Pests & diseases
- Keeping plants
enclosed makes
it easier to keep
them free from
pests & diseases
- Can add fertilisers to soil to provide minerals
- Keeping plants
enclosed makes
it easier to keep
them free from
pests & diseases
- Heat
- How plants use glucose
- For respiration
- Releases energy enabling
plant to convert rest of glucose
into other useful substances
- Need minerals from soil as well
- Need minerals from soil as well
- Releases energy enabling
plant to convert rest of glucose
into other useful substances
- Making cell walls
- Glucose converted into
cellulose for making
strong cell walls
- Especially in rapidly
growing plant
- Especially in rapidly
growing plant
- Glucose converted into
cellulose for making
strong cell walls
- Making proteins
- Glucose combined with
nitrate ions (from soil) to
make amino acids which
are made into proteins
- Glucose combined with
nitrate ions (from soil) to
make amino acids which
are made into proteins
- Storing in seeds
- Glucose turned into
lipids for storing in seeds
- Glucose turned into
lipids for storing in seeds
- Storing as starch
- Glucose turned into starch & stored
in roots, stems & leaves for when
photosynthesis isn't happening
- Starch is insoluble - better
for storing than glucose
- Starch is insoluble - better
for storing than glucose
- Glucose turned into starch & stored
in roots, stems & leaves for when
photosynthesis isn't happening
- For respiration
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