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gcse science B4 - C
specific for ocr gateway additonal science B.
| Question | Answer |
|---|---|
| what specialized cells form the transport system in a plant? | xylem and phloem cells |
| where are vascular bundles found? | from the roots to the stems and leaves |
| what do xylem cells carry? | water and minerals |
| where do xylem cells carry substances? | from the roots to the leaves for photosynthesis |
| what do phloem cells carry? | dissolved food such as sugars |
| where do phloem cells carry substances? | from the leaves to other parts of the plant |
| what is the movement of dissolved food called? | translocation |
| what is the transported sugar used for? | growth and stored as starch |
| what are xylem cell walls like? | thick and strong |
| what chemical do xylem cell walls contain? | lignin |
| what do xylem cells look like? | they are dead and join together to form a long hollow tube, called xylem vessels |
| what is the hole in the middle of xylem vessels called? | the lumen |
| what do phloem cells look like? | they are alive and make long thin columns |
| when does a high rate of transpiration happen? | -light intensity increases -temperature increases -air movement (wind) increases -humidity (amount of water in the atmosphere) falls |
| why does light intensity effect the rate of transpiration? | when light intensity increases, the stomata opens, allowing more water to escape |
| why does temperature effect the rate of transpiration? | when temperature increases, the random movement of water molecules increases and more water escapes |
| why does wind effect the rate of transpiration? | causes more water molecules near stomata to be removed, which increases evaporation and diffusion of water from inside the leaf |
| why does humidity effect the rate of transpiration? | in dry conditions, there's a very low concentration of water molecules outside the leaf, meaning more diffusion of water from inside the leaf to the outside |
| what do the xylem and phloem cells look like in the roots? | -xylem cells are in the middle -phloem cells are on the outside |
| what do the xylem and phloem cells look like in the stem? | they're in vascular bundles, arranged all around the plant. phloem cells are on the outside xylem cells are in the middle |
| what do the xylem and phloem cells look like in the leaves? | they're in vascular bundles phloem cells are on the outside xylem cells are in the middle |
Created by:
jirwin
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