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gcse science B4 - C

specific for ocr gateway additonal science B.

QuestionAnswer
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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