,"$L3f",null,{"backHref":"/igcse/biology/edexcel/questions","basePath":"/igcse/biology/edexcel/the-organism-in-the-environment/questions","formulaUrl":null,"initialIndex":18,"initialQuestionWindow":[{"id":"61bc8909-28c6-4b86-b019-b1af1e0acb63","revisionId":"eb903825-432b-4ffa-9dd5-f2459cfca857","questionNumber":null,"questionType":"LA","specification":"","difficulty":3,"difficultyBand":"easy","totalMarks":3,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"fca04d2f-f017-4476-8ab9-55efaa688080","label":null,"content":"In a large woodland conservation area, ecologists estimate that there are $4,800$ native red squirrels and $68,000$ invasive grey squirrels.\n\nCalculate the percentage of all squirrels in this conservation area that are native red squirrels.\n\nShow your working and give your answer to one decimal place.","markscheme":"- Calculates the total number of squirrels: $4,800 + 68,000 = 72,800$ (or sets up the fraction $\\frac{4,800}{4,800 + 68,000}$) M1\n- Calculates the proportion of red squirrels and converts to a percentage: $\\frac{4,800}{72,800} \\times 100 \\approx 6.5934\\%$ M1\n- Rounds correctly to one decimal place to obtain $6.6\\%$ A1","marks":3,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"a4d916cc-64a7-4296-958a-ef7785790ab2","revisionId":"ae6674f8-f764-401e-9bff-f491e17985d5","questionNumber":null,"questionType":"LA","specification":"During an ecological survey of a nature reserve, researchers sampled populations of the native two-spot ladybird (*Adalia bipunctata*) and the invasive harlequin ladybird (*Harmonia axyridis*). They recorded \$2,850\$ native two-spot ladybirds and \$41,200\$ invasive harlequin ladybirds.","difficulty":3,"difficultyBand":"easy","totalMarks":2,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"d2064cfb-098c-4d2d-97a8-b2f52c25bd5e","label":null,"content":"Calculate the percentage of all sampled ladybirds in this survey that are native two-spot ladybirds.\n\nShow your working and give your answer to one decimal place.","markscheme":"- Calculates the total number of ladybirds: $2,850 + 41,200 = 44,050$ and sets up the fraction: $\\frac{2,850}{44,050} \\times 100$ M1\n- State $6.5\\%$ (accept $6.5$) A1","marks":2,"order":0,"markingRubric":null,"explanation":null,"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null}],"subjectCode":"igcse_biology","summaries":[{"id":"008277fa-79c3-4622-817e-197bd78ca66f","difficultyBand":"medium","calculatorUse":null},{"id":"042298f1-52b3-4b3f-8a34-fd4f9f7a3b1e","difficultyBand":"medium","calculatorUse":null},{"id":"07f8af0f-ab2e-48bb-afdd-49a9d81dfe5b","difficultyBand":"medium","calculatorUse":null},{"id":"08b79ac5-0d3f-4931-8c33-e9d595d9224d","difficultyBand":"medium","calculatorUse":null},{"id":"093ea698-2a90-4daf-ac52-d3b8a6560bca","difficultyBand":"medium","calculatorUse":null},{"id":"0a64d4c1-c2f5-46e0-95a8-060816e69c84","difficultyBand":"medium","calculatorUse":null},{"id":"0c650a1f-1bc6-488f-bd7a-bc49b68f2fd2","difficultyBand":"medium","calculatorUse":null},{"id":"19cea3b6-0ff9-4f23-9a69-8ad4d7147925","difficultyBand":"medium","calculatorUse":null},{"id":"2258ea55-8515-4770-bfa9-1b85f1b7d2f8","difficultyBand":"medium","calculatorUse":null},{"id":"24399b58-1c83-4fbe-abce-6ee329e14e71","difficultyBand":"medium","calculatorUse":null},{"id":"3dac809e-40b4-44b0-9ebf-f051dfb220a0","difficultyBand":"medium","calculatorUse":null},{"id":"4cf412a4-dbe3-4c54-8f06-780c5992c181","difficultyBand":"medium","calculatorUse":null},{"id":"4d3bfdbc-281f-42d5-908e-75174fc712c4","difficultyBand":"medium","calculatorUse":null},{"id":"50f8fb3f-e575-4b46-a1a1-99bcf7935b30","difficultyBand":"medium","calculatorUse":null},{"id":"5a8215b6-999e-4991-8c51-093123e4e886","difficultyBand":"medium","calculatorUse":null},{"id":"5bfafc7d-0641-4f4c-897c-b77899a80d61","difficultyBand":"medium","calculatorUse":null},{"id":"5dc5969e-af39-4965-a7dd-7a683f4f9f91","difficultyBand"

The organism in the environment

Question 1

The organism in the environment Questions

The organism in the environment

Question 1

The organism in the environment Questions