Yr10 Biology Mock Answers Flashcards
 what is a tissue
A group of similar cells. (Which all do the same job)
Aspirin is a painkiller, which plant does aspirin originate from
Willow
Scientist have extracted chemical afrom the deadly nightshade plant
Chemical a can be used as a painkiller
The scientist usually extract, chemical a from the berries of the deadly nightshade
Suggest one reason why berries are use instead of leaves or roots
Easier to pick/harvest
Easier to extract chemicals
Less likely to harm the plant
Less likely to contain a toxic dose
Suggest one reason why the leaves of a deadly nightshade plants have chlorosis
They look yellow due to the lack of chlorophyll
It is a sign of magnesium deficiency
Suggest one reason why are you a part, making claims about the effects of chemical a may be biased
To help competitors sell their alternatives
Which part of the heart receives oxygenated blood from the lungs?
Left top
Which part of the heart pumps deoxygenated blood to the lungs?
Right bottem
A group of cells called the pacemaker control, the resting heart rate
Where in the heart is the pacemaker found?
Right atrium
Figure two shows a cross-section of an artery and a vein
Describe two ways that the structure of an artery is different from the structure of a vein
Arteries have thicker muscle, thicker elastic tissue, A narrow lumen, no valves
Explain the effect of a partially blocked coronary artery on the human body
Reduce blood flow would reduce oxygen and glucose
Muscle cells can do less aerobic respiration
More anaerobic respiration would happen instead, this releases less energy
Causes reduce muscle contraction
Reduces the ability to circulate blood to the body
Less glucose, plus oxygen circulated
Less CO2 removed
More likely to feel tired
More likely to feel breathless
Chest pains due to lactic acid in heart muscle
How do you salmonella bacteria in food, causes symptoms of vomiting and diarrhoea?
The bacteria produce toxins
Explain how the new systems of animals respond to vaccination, the nearest font in farm animals prevent an outbreak of food poisoning in humans
White blood cells begin to produce antibodies
The antibodies bind to fit onto salmonella antigens
Memory cells, stay active in the future to make high numbers of antibodies quickly
If farm animals have immunity, the chance of humans, eating infected food is far lower
Describe to aseptic technique The scientist should use in a antibiotic investigation
Disinfect your hands/worksurfaces
Use sterilise equipment
Flame any equipment before use
Work near a roaring Bunsen
Keep the agar covered with the Petri dish lid
Use tape to seal the dish
The scientist incubated the bacteria at 37°
Students in school lavatories, incubate bacteria, 25°
Explain why scientist is 37°, but students much is 25° to incubate bacteria
37° is a human body temperature
Salmonella would grow quickly at 37°, which is ideal for a scientist
But 25° is more safe for students as it prevents the growth of harmful bacteria
What is the purpose of the paper disc with no antibiotic in figure for
It is a control to prove the antibiotic is having any effect
