GCSE Biology: Wrong answered questions

Cards (94)

  • Explain why NITRATE (mineral), has the greatest effect on crop yield (2 marks)
    1.-Amino Acids
    2.-Protein
  • Suggest why an MRSA infection (a superbug resistant to many antibiotic) may have to be treated with many different antibiotics (1 mark)
    Any of these:
    to make sure ALL are killed (or destroyed)
    to find an antibiotic that is kills them all
  • Suggest a method that you could use to measure the rate of sweating (3 marks)
    Max 3 of these:
    1.-Measure the : mass or weight or volume or moisture of colour change

    2.-An apparatus used to measure the clothing/shirt/paper tower -> measuring cylinder (or a moisture sensor!)

    3.-Reference to time

    4.-Repeat/average
  • In a graph showing the effects of increasing ight intensity, there is a point in which there is NOT exchange of Carbon dioxide. Explain (1 mark)
    Because Respiration = Photosynthesis
  • Explain what is meant by the term transgenic organism (1 mark)
    Contains gene (or allele or DNA) from a different SPECIES
  • Name 2 large insoluble molecules in food that contain energy (2 marks)
    starch or cellulose or glycogen
    protein
    Note: reject carbohydrates!
  • Suggest why cells do not store glucose (instead convert to glycogen). (2 marks)

    1.-It is soluble (dissolves)
    2.-Osmotic effect, etc
  • Which blood vessel contains the most glucose after a meal? (1 mark)
    Blood vessel between intestines and liver
  • Which blood vessel contain the least oxygen
    Blood vessel between heart and lungs
  • SUGGEST how an individual can produce a chromosome such as XYY (1 extra!) (2 marks)
    1.-Failure of chromosomes to separate
    2.-Gamete has an extra chromosome
    3.-Normal egg/gamete fertilised by abnormal sperm/gamete
  • Many genetic disorders are caused by recessive allele, rather than a dominant allele.
    Explain how examing a family pedgree would enable you to tell if a condition was caused by a recessive allele.
    (3 marks)
    1.-The condition is present in the offspring but not in parents

    2.-It skips generations

    3.- Carriers are present
  • Suggest a reason for the difference between the BOD (Biological Oxygen Demand) of raw domestic sewage and the BOD of treated domestic sewage.
    Note: the amount of Oxygen removed from the water is called BOD
    (2 marks)
    1.-Raw domestic sewage has a higher B.O.D.
    2.-There is more bacteria/microorganisms in the raw sewage
    3-and SO there is more RESPIRATION
    4.-Raw seawage has more nutrients
  • Suggest two reasons why scientists obtain blood samples from a vein rather than from an artery.
    (2 marks)
    1.-There is a slower blood flow (lower pressure) in a vein (so it will not spurt out :-))

    2.-A vein has thinner walls (for the syringe to get in....)

    3.-Easier to see (access) as nearer the surface
    4.-wider lumen
  • Suggest 2 reasons why a pregnang woman needs more energy than a non pregnant woman.
    (2 marks)
    1.-A pregnant woman has more mass (is heavier)
    2.-more energy for growth/development or respiration of the fetus
  • Suggest how the tissue samples are removed and transferred to the agar medium.
    (Note: this is related to micropropagation of plants)
    (2 marks)
    1.-Cut with scalpel (or razor/scissors/knife)
    2.-Transfer with tweezers
    3.-Sterile the apparatus
  • Suggest why blood flow in a leg vein is slow when there is lack of movement (2M)
    .-There is muscles CONTRACTION
    .-Squeeze vein/ push blood
  • Suggest how to mantain the water quality in a pond (2M)
    Any 2:
    1-More OXYGEN (prevent stagnation). Could use paddles, pump or water plant to add ore oxygen

    2.-Remove the waste like faces, dead fish, leaves..

    3.-Prevent Eutrophication, e.g. don't fertilise nearby fields, so you prevent alga growth etc
  • Suggest how to control predation in the pond (2M)
    Any 2
    1.-Separate species/sizes/ages (adults eating babies..)

    2.-Cover with a net (or fence or cage etc)

    3.-Shoot birds! or an scarecrow or shoot predators!
  • Suggest how to control disease in the pond (2M)

    Any 2

    1.-antibiotics
    2.-fungicide
    3.-(kill) bacteria/fungi
    4.-remove dead/diseased fish
    5.-Reduce numbers ->do not overcrowd
    6.-Use resistant strains (i.e. fishes that are resistant to illness)
    7.-keep out wild fish (as they maybe sick)
  • Suggest feeding methods (for the fish) in the pond (2M)

    any 2 of these
    1.-Small quantities of food (so there is not uneaten food ...)

    2.-Feed the several times a day

    3.-High protein food

    4.-Remove the waste food

    5.-for less bacterial growth
  • Explain the change in water loss of the plant when half the leaves were removed (2M)
    1.-There is less surface area
    2.-There is fewer number of stomata
  • Explain what is meant by term hormone (2M)
    .-released from gland/endocrine
    .-travels in blood
    .-to target cells/organs
    .-effect/response/coordination/control/causes change..
  • suggest why amino acids are provided in the growth medium
    protein/enzymes/named protein
  • what is meant by the term pathogen (1M)
    organism that causes disease
  • which of these stop clocks(a digital one and one with min, sec and 1/100 and clock B that has minutes and seconds) give a more precise reading? (1M)
    A because has smaller scale intervals/ more decimals
  • Suggest why many plants may find it difficult to grow in sandy soil (2M)
    .-less water/water drains away or eq
    .-less anchorage
  • use your knowledge of how plant roots absorb mineral ions to suggest why some plants may find it difficult to grow in clay soil (2M)
    any 2:
    .-less oxygen
    .-active transport/active uptake
    .-respiration/energy/ATP
  • Describe what is meant by the term excretion (2M)
    removal
    of waste products of: cells /metabolisim/respiration or chemical reactions
  • Explain the rule of insuline in homeostasis (2M)
    lower blood glucose./sugar
    liver/muscle
  • Name the part of the gut where faeces are stored (1M)
    recturm
  • Selective breeding involves ?????? choosing organisms (1M)

    humans/breeders/scientists/farmers
  • Explain what happens in a leaf when it is destarched (2M)
    .-starch is removed
    .-(converted) to glucose
    .-respiration/energy
  • Bugs caught in a trap for 10 hours before being counted. How can this affect the results obtained ? (2M)

    results would be inaccurate/different
    bugs can escape
    bugs can be eater
    bugs can reproduce
  • Explain how having more red blood cells is an advantage to athletes who take part in long distance races (4M)
    .-more Oxygen
    .-haemoglobin
    .-muscles
    .-respiration
    .-(less) anaerobic respiration
    .-(less) lactic acid/ (less) oxygen debt/ (less) cramps
    .-more energy
    .-run faster/run longer/less tired
  • After an infection does the number of red blood cells and white blood cells increase? (2M)
    .-red blood cells numbers : do not increase
    .-white blood celss numbers: increase
  • Describe the sequence of events that cause a person to withdraw their hand from a hot object (5M)
    .-receptor/nerve ending
    .-sensory neuron / sensory nerve
    .-impulse / message /signal
    .-CNS/ spinal cord/grey matter
    .-synapse
    .-relay neurone/relay nerve
    .-motor neurone
    .-muscle/effector
    .-contract
  • He measured the rate of CO₂ y counting the number of bubbles per minute. How could be improved the accuracy of the measurements of the rate of CO₂ production (1M)

    volume of gas/ measuring cylinder/ syringe
  • What is meant by diffusion? (2M)
    .-movement of particles
    .-high concentration to low concentration
    -PASSIVE
  • Give 3 advantages of using biological control (in a crop field) instead of chemical pesticide (3M)

    Any 3
    1.-last longer/no need to reapply
    2.-it is specific: no harm to other species
    3.-no bioaccumulation
    4.-no resistance
    5.-no affect to food chain(s)
  • Name and describe the process used by root cells to absorb mineral ions (2M)
    .-active transport
    .-low to high conentration (or against concentration gradient)