Science - B4 - Photosynthesis

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Photosynthesis is a TWO-stage process:
1st - light energy splits water into oxygen gas and hydrogen ions. 2nd - carbon dioxide gas combines with the hydrogen to make glucose and water.
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ISOTOPE experiments show that the oxygen comes from the water.
Limiting factors of Photosynthesis: Carbon dioxide, light and temperature.
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Greek scientists all improved the understanding of photosynthesis.
Leaves are adapted for effective photosynthesis - large surface area, thin, contain pigments, have vascular bundles and guard cells.
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The balanced symbol equation for photosynthesis is:
light energy
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DIFFUSION is..
the net movement of particles from a high concentration to a low concentration.
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The rate of DIFFUSION is increased by -
a shorter distance, a greater concentration gradient and a greater surface area.
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TRANSIPRATION is..
the evaporation and diffusion of water from leaves.
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Transpiration rates is INCREASED by
increased light intensity, temperature, air movement and a decrease in humidity.
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Osmosis is..
the net movement of water from a high to a low water concentration across a partially permeable membrane.
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PLANTS require:
NITRATES for cell growth PHOSPHATES for respiration and growth POTASSIUM for respiration and MAGNESIUM for photosynthesis.
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Minerals are ABSORBED by ACTIVE transport which needs energy.
DETRITIVORES feed on DEAD and DECAYING material.
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Organic farming uses animal manure, crop rotation, weeding and differing planting times.
Biological control has advantages (for chemical pesticides) and disadvantages
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Hydroponics has advantages (better control of minerals and water) and disadvantages (lack of support).
Intensive food production improves the efficiency of energy transfer.
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Other cards in this set

Card 2

Front

ISOTOPE experiments show that the oxygen comes from the water.

Back

Limiting factors of Photosynthesis: Carbon dioxide, light and temperature.

Card 3

Front

Greek scientists all improved the understanding of photosynthesis.

Back

Preview of the front of card 3

Card 4

Front

The balanced symbol equation for photosynthesis is:

Back

Preview of the front of card 4

Card 5

Front

DIFFUSION is..

Back

Preview of the front of card 5
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