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Biology 4
what i need to know for my exam
| Question | Answer |
|---|---|
| name the sections of a leaf? | the top is the cuticle. then theres a lower and upper epidermis, then a spongy mesophyll and plaisade cell, at the bottom a stomata and a guard cell. veins. |
| how are leaves adapted to do photosynthesis? | they have a large surface area. thin and short for gas to travel over. they contain cholorphyll to absorb light/energy. has a network and vein for support and tranport. the stomta is for gas exchange |
| what is diffusion? | it is the movement of water from an area of a high water concentation to an area of a low concentration. across a partially-permeable membrane and is a consequence of the random movement of individual particles. |
| Explain how plants are supported by the turgor pressure within cells:water pressure acting against inelastic cell wall. | when thier is enough water in the cell it will swell making it more turged and supported |
| Explain the terms: flaccid, plasmolysed. | when thier isnt enough water the cell/plant will begin to shrink, this is becasue their isnt enough pressure, this makes it flaccid and the cell is plasmolsyed. |
| decribe a phloem and the xylem | a phloem is manily for food such as sugars, it allows them to travel in to ways (directions), the xylem only allows things to travel up. |
| nitrates, phosphates and potassuim, what happens when their isnt enough and what are they used for. | nitrates: for maiking amino acids and proteins, cell growth. if there are none it stunts growth. |
| nitrates, phosphates and potassuim, what happens when their isnt enough and what are they used for. | phospahtes: for DNA and cell membranes, respiration and growth, none casues purple leaves. potassium: help emzyms, none casues poor flower/fruit growth , discoloured leaves |
| Explain how the cellular structure of a leaf is adapted for efficient photosynthesis: | epidermis is transparent;palisade layer at the top containing most of the chloroplasts;air spaces in the spongy mesophyll allow diffusion between stomata and photosynthesising cells; internal surface area / volume ratio very large. |
Created by:
emilyrosegray
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