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B1 GCSE

gcse unit 1 AQA

QuestionAnswer
the nucleus contains.. genetic material in the form of chromosomes
metabolism? The chemical reactions that take place in the body
metabolic rate? the rate at which chemical reactions take place in the body
organisms compete for? Plants: light,space,water,nutrients. Animals: space/territory,food,water,mates.
how many chromosomes dos the nucleus have? 23 pairs
chromosomes carry.. ..genes that control the development of different characteristics-is a short length of the chromosome.
what is a healthy diet? it contains the right balance of the different foods we need.
factors causing environmental changes. Living: infectious disease, predators, availability of food sources, competitors. Non-Living: average temp. average rainfall. air/water pollution.
Food groups & their uses Carbs-provide energy. Proteins- growth,cell repair/replacement. Fibre: everything runs smoothly through digestive system. Fats: keep warm and release energy. Minerals/Vitamins: small amounts for healthy functioning.
Menstrual cycle: Stage 1 Day 1-is when the bleeding starts. the uterus lining breaks down for about four days.
Menstrual cycle: Stage 2 The lining of the uterus builds up again, from day 4-14, into a hick spongy layer full of blood vessels ready to receive a fertilised egg.
Menstrual cycle: Stage 3 an egg is released from the ovary at Day 14
Menstrual cycle: Stage 4 thickened uterus tissue lasts for around 14 days and if no fertilisied egg is received the uterus lining breaks up and the cycle repeats itself.
Created by: CBA
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