Curriculum
Course: Edexcel A Level Biology A (SNAB) 9BI0
Login

Curriculum

Edexcel A Level Biology A (SNAB) 9BI0

Topic 1 · Lifestyle, Health and Risk

0/50

Topic 2 · Genes and Health

0/76

Topic 3 · Voice of the Genome

0/55

Topic 4 · Biodiversity and Natural Resources

0/51

Topic 5 · On the Wild Side

0/72

Topic 6 · Immunity, Infection and Forensics

0/41

Topic 7 · Run for your Life

0/55

Topic 8 · Grey Matter

0/51
Quiz

8.1.8 Phytochrome – Unit exam questions

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
Cancel Submit
  • Questions count: 12
  • Passing grade: B+
Start Quiz
1.
Which drug action in the table prolongs the signal by keeping transmitter in the synapse?
Blocking receptors
Blocking reuptake
Reducing release
Destroying vesicles
2.
Which statement best describes Neurone?
Jumping of the action potential between nodes of Ranvier, increasing conduction speed.
A cell specialised to transmit electrical impulses.
The period after an action potential when a new one cannot be generated, ensuring one-way, discrete impulses.
The potential difference across the membrane of a resting neurone, about −70 mV, inside negative.
3.
The gap between neurones is the:
Nucleus
Dendrite
Synaptic cleft
Axon
4.

CT scans use

X-rays to give images of structure
magnetic fields
radioactive tracers
ultrasound
5.
Which best defines homeostasis?
Growth of an organism
Response to light
Maintaining a constant internal environment
Producing hormones
6.
How is stimulus intensity coded?
Size of action potential
Frequency of action potentials
Speed of conduction
Duration of refractory period
7.
Which statement best describes Tropism?
A muscle or gland that carries out a response.
A rapid, automatic response to a stimulus that does not involve conscious thought.
A change in the internal or external environment that can be detected by a receptor.
A growth response of a plant towards or away from a directional stimulus.
8.
What is the correct order in a reflex arc?
Receptor, motor, relay, sensory, effector
Receptor, sensory, relay, motor, effector
Effector, motor, relay, sensory, receptor
Sensory, receptor, relay, effector, motor
9.
Which is a feature of hormonal control compared with nervous control?
Faster
Uses electrical impulses
Very precise single target
Longer-lasting effect
10.

The resting potential of a neurone is about

+40 mV
0 mV
−200 mV
−70 mV
11.
A growth response toward or away from a stimulus is a _____.
transpiration
pollination
germination
tropism
12.
Many drugs act at synapses. True or false?
False
True
False, only on myelin
True only for medicines
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
Part of Topic 8 · Grey Matter — see every lesson and quiz in this unit.
Accepted payment methods