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plants chap 13/6
| Question | Answer |
|---|---|
| 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. | |
| what are plants exchange surface ? root hairs | |
| what do dicotyledonus root have? endodermis , casparin strip - made of waxy waterproof substance , protoplast , endodermal cell ,xylem ,ploem , cortex. | |
| whqt are root hair responsible for? absorbtion of water and mineral ions. | |
| how to plants lose water mostly? tranpiration: up to 700dm3 per day in large tree. water must be replaced. | |
| how long is root hair cell functional? a few weeks b4 dying. | |
| how is root hair adapted? THIN LONG EXTENSION OF EPIDERMAL CELL LARGE SURFACEA - OCCUR IN 1000S. | |
| Where do root hair cells arise from? epidermal cell | |
| Why does water move via osmosis into root hair cell? root hair cell has sugar aminoA, mineral ions dissolved inside - has LOW WP. | |
| In damp conditions what are root hair surrounded by? soil solution - mineral ions but mostly water. HIGH WP . | |
| what happens after water absorbed into roit hair cell? water continues journey across root via - apoplastic / symplastic pathways. apoplast symplast. | |
| what hqppens in applastic pathway? as water drawn into endodermal cells - pulls water alobg behind it - due to coheive properties. | |
| In the apoplast what does the cohesoin of water cause? tension - which draw water along cell walls of cells of root cortex. cellulose cell walls have mesh like structure - little resistance to pull water ALONG cell walls. - HAS WATER FILLED SPACES. | |
| What is cohesion? is mutual attraction of molecules - ability of molecules e.g. water molecules to stick together. | |
| WP values of SOUTIONS are? negative - water goes from high wp to low wp. - less negative to more negative. | |
| where does symplastic pathway occur? across cytoplams of cells of cortex due to osmosis. | |
| what haps in symplastic pathway? water passes along tiny openings ( PLASMODESMATA). Each PLASMODESMA - filled with strand of cytoplasm - so there is an extensions of the CYTOPLASM from ROOT HAIR CELL to XYLEM at cetre of root. | |
| what does the CASPARIN strip do? It prevents water progressing further along CELL WALL. | |
| As a result of casparin strip preventing water along cell wall? Water is forced into living protoplast of cell - joining water from symplastic pathway. |
Created by:
ufuoma
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