OCR Gateway GCSE Combined Science A biology organisms and ecosystems overview quiz quiz

Effector, motor neurone, relay neurone, sensory neurone, receptor

Receptor, sensory neurone, relay neurone, motor neurone, effector

Receptor, motor neurone, relay neurone, sensory neurone, effector

Sensory neurone, receptor, effector, relay neurone, motor neurone

Because the body's response actually makes the original change even bigger over time

Because the body temperature being controlled is always a negative number on the scale

Because the response opposes the change and returns the condition to normal

Because no feedback of any kind is involved in controlling body temperature at all

Glucagon

Adrenaline

Testosterone

Insulin

Photosynthesis

Respiration in animals

Combustion of fuels

Decomposition by microbes

Because nitrogen gas from the air is highly poisonous to all green plants

Because they can only absorb nitrates from the soil, made by bacteria

Because nitrogen gas is far too heavy for the plant to draw up its roots

Because plants do not actually need any nitrogen in order to grow well

1 to 1

1 to 2 to 1

3 to 1

2 to 1

Sexual reproduction makes identical clones, while asexual reproduction makes genetically varied offspring

Both sexual and asexual reproduction always make genetically identical clones of the parent

Both sexual and asexual reproduction make genetically varied and different offspring

Sexual reproduction makes genetically varied offspring; asexual makes identical clones

Random mutation makes some bacteria resistant, and the antibiotic kills the rest so the resistant ones survive and reproduce

The antibiotic itself deliberately and directly changes the genes of the bacteria so that they all become resistant to it

All of the bacteria in the whole population somehow decide together at the same time that they will become resistant to the drug

Resistance to an antibiotic is completely impossible in bacteria and can never actually happen to any of them at all

Live and fully active pathogens, which then cause the body to make its own antibiotics to fight them

Dead or inactive pathogen or its antigens, causing the body to make antibodies and memory cells

A dose of antibiotics, which goes on to kill the invading pathogen directly inside the body

Nothing but sugar, which works by strengthening the blood and the immune system overall

Because antibiotics are far too expensive to use on such common illnesses

Because colds and flu are not actually real diseases that need any treatment

Because colds and flu are caused by viruses, which antibiotics do not kill

Because antibiotics only ever work on plants and never on the human body