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plants chap 13/3

QuestionAnswer
When would water leak out if xylem vessel broken? If xylem under pressure.
Is transpiration passive or active? why? passive. xylem vessel dead - can' t move water.
because xylem are dead what hap to end walls? they can break down. forms continous unbroken tubes from root. to leaves. good for cohesion - tension theory.
what does casparin strip prevent? movement of water across cell wall.
HUG a tree finger will meet in day , but not at night.
role of trans: how are leave adapted for photosynthesis? have large surfaceA - to absorb light. stomata - inward diffusion of C02. both result in LOSS OF WATER.
Why is transpiration not neccessary? it helps bring water to leaves - but OSMOSIS THOSE THE SAME.
What is stomata? the opening in leaves through which CO2 needed photo DIFFUSES.
How does light affect transpiration? photosynthesis only in light. stomata most plants open in LIGHT close in DARK.Day and night. increase in light intensity - increase in transpiration. when stomata open - water move out into atm.
how does temp affect transpiration? rise in temp: increases kinetic energy of h2o mole. rate of evaporation. increase transpirtion. decreases Airs water potential. (factors that affect transpiration) (factors that affect transpir
reduction in temp on transpiration? decreases rate of transpiration.
what are the 2 things temp affects? (factors that affect transpiration) WP of air . speed water molecules move.
what does humidity affect? (factors that affect transpiration) the wp grad of air outside leaf and in leaf.
when air outside leaf has higher humidity? (factors that affect transpiration) GRADIENT REDUCED. RATE OF TRANS LOWER.
Low humidity of air outside leaf? (factors that affect transpiration) GRADIENT INCREASED. INCREASE TRANS.
what happens when water diffuses out stomata? accumulates vapour around stomata . (factors that affect transpiration)
what does this accumulated vapour cause ? Wp to increase. reducing WP gradient of air in AIR SPACES in leafs and OUTSIDE. Transpiration (REDUCED) .
how would you increase the rate of transp ? humidity (factors that affect transpiration) movement of air around leaf. disperse humid layer on leaf . decreases WP of air . increasing WP gradient. hence rate of transpiration.
greater WP between outside and inside of leaf....? faster water moves out. Faster rate of transpiration.
why does sun drive transpiration? influences humidity ,temp,light,air movement.
changes to to external enviroment? affect transpiration
measure water uptakes using potometer? difficult to measure transpiration - coz diff to condense & collect all water vapour. 99% of water take up by plants lost.
what conditions can you measure water uptake? (3) wind speed , temp or humidities.
why / how do plants need to conserve water? terestial - cannot absorb water over general body surface. has waterproof layer.
Created by: ufuoma
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