Nutrition

Traps in Nutrition

• Enzyme-substrate mismatches in digestion
  Amylase: starch → maltose (mouth, duodenum). Pepsin: protein → polypeptides (stomach, acid). Lipase: fats → fatty acids + glycerol (small intestine). Bile emulsifies but is NOT an enzyme.
• Gives the job of a neighbouring structure or stage
  Learn structures as pairs of 'name → one job' and contrast neighbours: ribosome makes protein, mitochondrion releases energy; cochlea hears, semicircular canals balance. When two options sit in the same organ or process, ask which one does exactly the job in the stem.
• Mixes up a pair of similar technical terms
  Make a two-column table for each confusable pair with one defining feature each, and a memory hook (aTLas holds the 'world' (skull) and nods; aXis lets you shake 'no'). Underline the defining feature the stem gives before you look at the options.
• Takes one contributing factor as the whole answer
  Watch for 'only', 'just', 'mainly'. Ask: is this the MAIN reason, or one contributor? If it would need other things to work (plasma proteins need platelets), it is incomplete.
• Uses an everyday idea instead of the biology
  Translate everyday words into the textbook definition before choosing. If the only reason an option attracts you is its name or looks, test it against the definition in the stem.
• Transfers a feature to the wrong organism group
  Keep a feature grid: rows = groups (bacteria, fungi, mosses, ferns, conifers, flowering plants, insects, fish, mammals), columns = wall, nucleus, gas exchange, reproduction. Check the option against the right row.
• Confuses food classes and their functions
  Carbohydrates and fats: energy. Proteins: growth and repair. Vitamins and minerals: protection (e.g. vitamin C → scurvy, iron → anaemia, iodine → goitre). Water and roughage are needed too. A balanced diet has all classes in the right proportions.
• Reverses a direction, order or effect
  Before answering, say the process out loud in order with arrows (receptor → sensory → relay → motor → effector; lungs → pulmonary vein → left atrium). Then ask: does my option point the same way? If an option is the mirror image of a fact you know, it is a trap.
• Chooses a true but irrelevant statement
  Re-read the question word (why, which, where, what causes). An option can be a true fact and still be wrong because it answers a different question.
• Enzyme misconceptions
  Enzymes are protein catalysts, specific (lock and key), unchanged by reaction. High temperature denatures them; low temperature only slows them. Each has an optimum pH (pepsin ≈ 2, salivary amylase ≈ 7).
• Puts an example in the wrong group
  Classify by the defining features in the key, not by habitat or name: mammals have hair and mammary glands; true fruits come from the ovary only. Check each option against the defining feature in turn.
• Disease and vector misconceptions
  Malaria: Plasmodium, vector female Anopheles. Sleeping sickness: Trypanosoma, tsetse fly. Bilharzia: Schistosoma, water snail. Tuberculosis: bacterium, droplets. Control: break the vector's life cycle, vaccination, sanitation.