FACTORS AFFECTING TRANSPIRATION

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HOW ARE GUARD CELLS ON LEAF ARE ADAPTED TO ROLE?

Thicker inner cell wall;
Able to change shape/bend;
Presence of chloroplasts;

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COHESION-TENSION THEORY TO MOVE WATER? (3)

Evaporation takes place at the top of plant;
Creates tension in xylem;
Water molecules stick together/are cohesive;
Then pulled/drawn up by tension;

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WHAT ARE ASSIMILATES? HOW DO THEY MOVE? (2)

Assimilates - sucrose, amino acids;
Movement - diffusion;

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HOW DO DIFFERENT SIZED LEAVES AFFECT TRANSPIRATION

Different numbers of stomata;
Surface area different;

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HOW DO WET LEAVES AFFECT TRANSPIRATION? (1)

Decreases water potential gradient;

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EXPLAIN EFFECT OF TEMP. ON PHLOEM TRANSPORT. (3)

Active transport requires ATP;

At low temperatures molecules have low kinetic energy;
Therefore less ATP made;
Less movement of sugars into the sieve tube;

ORA

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