AQA GCSE COMBINED SCIENCE TRILOGY B2 Questions and Answers

AQA GCSE COMBINED SCIENCE
TRILOGY B2 Questions and Answers.


Plasma - (correct answer) - Transports dissolved substances around the body
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red blood cells - (correct answer) - Transports oxygen from lungs to body cells
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white blood cells - (correct answer) - Protects body against infection
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Ateries - (correct answer) - Carries blood away from the heart
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Veins - (correct answer) - Carries blood into the heart
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Capillaries - (correct answer) - Substances such as oxygen and glucose to diffuse in and out of cells
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Platelets - (correct answer) - Helps the blood to clot
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Correlation - (correct answer) - Doesn't prove cause simply suggests they might be linked
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causal mechanism - (correct answer) -
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something that explains how one factor influences another through a biological process
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risk factors - (correct answer) - Factors leading to an increased rate of disease
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Cancer - (correct answer) - Changes in cells that lead to uncontrolled growth and mitosis
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Benign tumour - (correct answer) -
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Growth of abnormal cells contained in one area in a membrane. Doesn't invade other parts of the bod
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Malignant tumours - (correct answer) - cv cv cv cv cv




Invade neighbouring tissues and move into bloodstream and spread to form secondary tumours.
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Health - (correct answer) - State of physical and mental well being
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coronary arteries - (correct answer) -cv cv cv cv cv




Provide oxygen to muscle cells of heart used in respiration for contraction
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CHD (coronary heart disease) - (correct answer) - Layers of fatty material build up in coronary ateries
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, upper epidermis - (correct answer) - Transparent-
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allows light to pass through to the photosynthetic cells
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lower epidermis - (correct answer) - contains stomata
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palisade mesophyll - (correct answer) - Full of chloroplasts for photosynthesis
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Spongy mesophyll - (correct answer) -
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Full of air spaces for c02 to diffuse from stomata to spongy mesophyll to palisade cells
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Xylem - (correct answer) - Transports water from roots to stem and leaves.
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Structure of xylem - (correct answer) -
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Hollow tube strengthened by lignin for efficient transport of water in transpiration stream
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Phloem - (correct answer) -
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Transports dissolved sugars from leaves to rest of plant. Stored as starch or used for respiration
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Structure of phloem - (correct answer) -
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Tubes of elongated cells. Cell sap move from one phloem cell to another through pores in end walls
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Translocation - (correct answer) - Movement of sugars through phloem
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Meristem - (correct answer) - Contains stem cells
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Root hair cell - (correct answer) -
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Adapted by osmosis for uptake of water and active transport for uptake of mineral ions
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Tissue - (correct answer) - Group of cells with a similar function
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Organ - (correct answer) - Group of tissues which work together to form organisms
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Organ system - (correct answer) - Group of organs which work together to form organisms
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Digestion - (correct answer) - cv cv cv cv




Large food molecules broken down to smaller ones by enzymes which is then absorbed to the bloodstr
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Proteins(digestive enzymes) - (correct answer) - cv cv cv cv cv




Broken down by proteases to form amino acids which are then absorbed into the bloodstream
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Carbohydrates(digestive enzymes) - (correct answer) - Broken down by carbohydrases cv cv cv cv cv cvcv cv cv cv




Lipids (digestive enzymes) - (correct answer) -
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Digested by lipase and produces glycerol and fatty acids which is found in the small intestine and pancr
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Bile(digestive enzymes) - (correct answer) - Large lipid droplets to smaller ones and emulsifies the lipid
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