Structure and Functions in Living Organisms

Worked examples (6)

• 1Match each nutrient to its reagent and result (Getting started)
• 2Method for the reducing-sugar test (Getting started)
• 3Interpret an iodine result (Building confidence)
• 4Explain the emulsion (ethanol) test for fat (Building confidence)
• 5Design a control for a food test (Stretch)
• 6Identify nutrients from a results table (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Put the levels in order of size (Getting started)
• 2Tell an organelle from a cell (Getting started)
• 3Tissue versus organ (Building confidence)
• 4Organ or organ system? (Building confidence)
• 5Classify a leaf with full reasoning (Stretch)
• 6Match named examples to their level (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the structure from its job (Getting started)
• 2Three plant-only structures (Getting started)
• 3Match structures to their functions (Building confidence)
• 4Identify a cell from a diagram (Building confidence)
• 5Compare a plant and an animal cell (Stretch)
• 6Reason about where photosynthesis can occur (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Element unique to proteins (Getting started)
• 2Basic unit of starch and glycogen (Getting started)
• 3Building units of a lipid (Building confidence)
• 4Protein building blocks (Building confidence)
• 5Match each molecule to its elements (Stretch)
• 6Complete the molecule / basic-unit table (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1State the optimum temperature from a graph (Getting started)
• 2Why rate rises as temperature increases (Getting started)
• 3Why rate falls above the optimum (Building confidence)
• 4Describe the rate–temperature curve (Building confidence)
• 5Designing a fair temperature investigation (Stretch)
• 6Cooling a denatured enzyme (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Define an enzyme (Getting started)
• 2Name the part the substrate binds to (Getting started)
• 3Describe the lock-and-key model (Building confidence)
• 4Sequence from substrate to products (Building confidence)
• 5Explain why amylase cannot digest protein (Stretch)
• 6Explain the advantage of enzymes to a cell (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1What the iodine colour tells you (Getting started)
• 2Identify the variables (Getting started)
• 3Fix a flawed method (Building confidence)
• 4Calculate the rate of reaction (Building confidence)
• 5Explain the shape of the rate–temperature graph (Stretch)
• 6Evaluate the experiment (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Define diffusion (Getting started)
• 2Define osmosis (Getting started)
• 3Active transport into a root hair cell (Building confidence)
• 4Which process is happening? (Building confidence)
• 5Why root hair cells have many mitochondria (Stretch)
• 6Compare diffusion, osmosis and active transport (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Read the optimum pH from a graph (Getting started)
• 2Match an enzyme to its environment (Getting started)
• 3Describe how rate changes with pH (Building confidence)
• 4Explain why high pH stops the enzyme (Building confidence)
• 5Compare two enzymes on one graph (Stretch)
• 6Explain experimental results across a pH range (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name factors affecting the rate of diffusion (Getting started)
• 2Why a thin surface speeds movement (Getting started)
• 3Surface area to volume ratio of a cube (Building confidence)
• 4Why blood flow keeps absorption fast (Building confidence)
• 5Adaptations of the alveolus for gas exchange (Stretch)
• 6Interpret a temperature–rate result (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1What process moves the water? (Getting started)
• 2Which way does the iodine move? (Getting started)
• 3Calculate the percentage change in mass (Building confidence)
• 4Make it a fair test (Building confidence)
• 5Read the cell concentration off the graph (Stretch)
• 6Improve the investigation (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1State what photosynthesis is (Getting started)
• 2Write the balanced symbol equation (Getting started)
• 3Identify the limiting factor (Building confidence)
• 4Describe a light-intensity rate graph (Building confidence)
• 5Explain a temperature rate graph (Stretch)
• 6Raise the maximum rate at the plateau (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the layer that does most photosynthesis (Getting started)
• 2Where are the stomata and what do they do? (Getting started)
• 3Label a leaf cross-section (Building confidence)
• 4Explain two light adaptations (Building confidence)
• 5Explain the path of carbon dioxide into a leaf cell (Stretch)
• 6Why a leaf is large and thin (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the ion needed to make chlorophyll (Getting started)
• 2What nitrate ions are used for (Getting started)
• 3Explain yellow leaves on a plant (Building confidence)
• 4Explain stunted growth in a plant (Building confidence)
• 5How roots absorb mineral ions (Stretch)
• 6Match two symptoms to two ions (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Why food must be digested (Getting started)
• 2Name the enzyme and where it is made (Getting started)
• 3Complete the starch digestion pathway (Building confidence)
• 4Match enzymes to proteins and lipids (Building confidence)
• 5Explain the link to absorption (Stretch)
• 6Interpret a starch-digestion result (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Reading the iodine result (Getting started)
• 2Bubbles and lamp distance (Getting started)
• 3Order the starch-test steps (Building confidence)
• 4Variegated-leaf result (Building confidence)
• 5Design a fair test for CO₂ (Stretch)
• 6Analyse a bubble-count table (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Put the parts in the correct order (Getting started)
• 2Why the stomach makes acid (Getting started)
• 3Two regions of the small intestine (Building confidence)
• 4Is the pancreas part of the gut? (Building confidence)
• 5Egestion versus excretion (Stretch)
• 6Track a meal through the gut (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1What moves food along the gut? (Getting started)
• 2Name the two muscle layers (Getting started)
• 3How circular muscle pushes the bolus (Building confidence)
• 4The role of fibre in the gut (Building confidence)
• 5Describe the full process of peristalsis (Stretch)
• 6Predict the effect of a low-fibre diet (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Name the components of a balanced diet (Getting started)
• 2Match the macronutrient to its function (Getting started)
• 3Identify a vitamin from its deficiency (Building confidence)
• 4Explain why fibre and water are needed (Building confidence)
• 5Compare the energy needs of two people (Stretch)
• 6Build a sources-and-functions table (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Where bile is made and stored (Getting started)
• 2Is bile an enzyme? (Getting started)
• 3Why bile neutralises stomach acid (Building confidence)
• 4How emulsification speeds up fat digestion (Building confidence)
• 5Both roles of bile in one answer (Stretch)
• 6Distinguish bile from lipase (Stretch)

Model answers (5)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1What is absorbed and where it goes (Getting started)
• 2Why villi increase absorption (Getting started)
• 3Thin wall and diffusion distance (Building confidence)
• 4How the blood supply keeps absorption going (Building confidence)
• 5Explain three adaptations of a villus (Stretch)
• 6The role of the lacteal (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1State what is meant by respiration (Getting started)
• 2Name the molecule made in respiration (Getting started)
• 3Uses of the energy released by respiration (Building confidence)
• 4Respiration versus breathing (Building confidence)
• 5Why muscle cells have many mitochondria (Stretch)
• 6Respiration and active transport (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1What respiration is and where it happens (Getting started)
• 2Products of anaerobic respiration (Getting started)
• 3Word and symbol equations for aerobic respiration (Building confidence)
• 4Two differences between aerobic and anaerobic respiration (Building confidence)
• 5Explaining oxygen debt after a sprint (Stretch)
• 6Why anaerobic respiration yields less energy (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response

Worked examples (6)

• 1Which CO₂ test result shows respiration? (Getting started)
• 2Why germinating seeds and not dry seeds? (Getting started)
• 3Reading the heat experiment (Building confidence)
• 4Purpose of the boiled seeds (Building confidence)
• 5Designing a fair test for heat (Stretch)
• 6Evaluating an unexpectedly small temperature rise (Stretch)

Model answers (6)

• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style
• ✓Model answer — 4WSD0/1B style — extended open response
• ✓Model answer — 4WSD0/1B style — extended open response