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Abio otic facttors and d com mmunitie es – Stre engthen n CB9b b.2 Name N 1 a b Class s Below w is a list of factors f that can c affect the e rate of grow wth of a plant when they have low values. Draw one liine to link ea ach factor witth one reaso on why it affects plant growth. Facto or Reason low te emperature reduces reaction ratees because most m reactions s in cells takee place in so olution low m mineral ion co ontent of soil enzyme--controlled reeactions are slower low w water contentt of soil reduces the amount of energy the plant receives for photosynnthesis low light levels reduces the amount of some sub bstances (e.g g. proteins)) the plant caan make e the name of o the type off factors liste ed above. Circle abiottic factors 2 Daate biotic factors community c fa actors polluttants The draw wing shows part p of a wood. If half the trees are cut down, it will chang ge some of the factors th hat affect the low-grow wing plants. a Desccribe and exp plain how the e factors belo ow would chang ge. Give a re eason for eac ch answer. i w water availab bility _ ___________ ___________ ___________ __________ _ _ ___________ ___________ __________ __________ ii light availabillity _ __________ ___________ ___________ __________ ___________ ___________ ___________ ___________ _ _ __________ ___________ ___________ __________ ___________ ___________ ___________ ___________ _ b Expla ain how the growth g of low w-growing pla ants might ch hange withou ut the trees. ____ __________ ___________ ___________ __________ ___________ ___________ ___________ ___________ _ ____ __________ ___________ ___________ __________ ___________ ___________ ___________ ___________ _ S1 A wood dland is thinn ned by removing half the e trees. Expla ain what effect this may hhave on low-g growing plants in the following year. 3 A belt tra ansect is pla aced so that it starts in a w wood and en nds in open meadow. m Thee transect is used to study the e distribution n of low-grow wing dandeli on plants. a Desccribe how you u would spac ce out the qu uadrats along g the transec ct. ____ __________ ___________ ___________ __________ ___________ ___________ ___________ ___________ _ b Dand delion plants do not grow well in shad de. Predict the distribution n of dandelioon plants alon ng the transect, giving a reason for your y answer. ____ __________ ___________ ___________ __________ ___________ ___________ ___________ ___________ _ ____ __________ ___________ ___________ __________ ___________ ___________ ___________ ___________ _ © Pearson Educcation Ltd 2017.. Copying permiitted for purchasing p instittution only. Thiss material is not copyright free. 3
