neuron and plant respont

Which numbered parts form the central nervous system?

• 1 only

• 1 and 2

• 2 and 3

• 3 only

• A

• B

• C

• D

The diagram shows a reflex arc.

Which labelled part is the effector?

• A

• B

• C

• D

Gravitropism and phototropism are names given to specific plant growth responses.

How do shoots and roots normally respond?

• A

• B

• C

• D

• gravitropism

• photosynthesis

• phototropism

• reflex

What is the sequence of neurones connecting a receptor to an effector in a reflex arc?

• motor > relay > sensory

• motor > sensory > relay

• sensory > motor > relay

• sensory > relay > motor

The diagram shows a seedling growing inside a dark box.

• A

• B

• C

• D

The diagram shows a reflex arc.

• A

• B

• C

• D

What is an example of phototropism?

• a chemical messenger produced by a plant

• a painful sensation in response to a stimulus

• The growth of a plant root towards the centre of the Earth

• the growth of a plant shoot towards light

Sensory neurones conduct impulses from

• the brain and spinal cord to muscles.

• one sense organ to another sense organ.

• sense organs to the brain and spinal cord.

• sense organs to muscles.