Download B1 Core revision

B1 Core revision
Session 1
We are going to concentrate on the
key knowledge needed for the exam
We need to practice answering to a
time limit
Answers to Q1
Kingdom
Characteristics
Animalia
multicellular, no cell walls, no
chlorophyll, feed heterotrophically
Plantae
multicellular, have cell walls, have
chlorophyll, feed autotrophically
Fungi
multicellular, have cell walls, no
chlorophyll, feed saprophytically
Protoctista
unicellular, have a nucleus
Prokaryota
unicellular, have no nucleus
The next 3 questions will take 3min
• Why are viruses not classified in a kingdom?
• What does Chordata mean?
• What are vertebrates?
Q2
• VIRUSES are classified as NON LIVING
because…
• The virus does not show the characteristics of
life such as growth and feeding (1)
• They need a host to reproduce
Q3
• A Rod shaped Backbone
• Spinal cord will be marked
wrong
• It is also the PHYLUM
Q4
Animals with backbones
1min
• Why would a scientist classify an animal as a
vertebrate?
• If it had a backbone
What reasons could cause an animal to
become extinct?
• It says reasons so more than one
• Timer is 2 mins
You get lots of these types of
questions.
• Cave Bears have the bimominal name Ursus
spelaeus, which is the genus and which is the
species?
• This fungi is Russula silvicola, which is the
genus and which is the species?
• The binominal name for tigers is Panthera
tigris, which is the genus and which is the
species?
Evolution
• What are the stages of evolution?
V O C A B
• Variation – individuals in a species differ
• Overproduction – more offspring than survive
to be adults
• Competition
• Advantageous characteristic – they survive
• Breeding – those with AC will reproduce
What does geographic isolation mean?
• When animals are separated from the rest of
their group, usually by accident so they can’t
all interbreed anymore.
• E.g an earthquake
• The two groups will evolve different
advantageous characteristics to survive
Why might an animal become extinct?
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Predators killing them
Disease
Change in environmental conditions e.g snow
Loss of food source
Increased competition
Limited adaptations
Unable to rproduce
Nervous system
1. What are the three type of neurone?
2. What is a stimulus?
3. What is an effector?
3 minutes
Answers
• Sensory, motor, relay
• A change in environment
• The organ that carries out the response e.g
the muscle that moves
• How does information travel along a sensory
neurone?
2 minutes
Answers
• From the receptor
• To the brain/spinal cord
• As an electrical impulse
• What is the role of the myelin sheath?
2 minutes
Answer
• Insulates – NOT Protects
• The axon and speeds up the impulse
• Describe the pathway of a nerve impulse
through a reflex arc.
3 minutes
Answer
• Receptor cells pick up a stimulus
• Sensory neurone sends a message to the
spinal cord.
• The message travels from the spinal cord to a
relay neurone then to the motor neurone
• There is a response in the effector
Plant growth Hormones
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What is a seedling?
Which way should shoots grow?
Which way should roots grow?
What is gravitropism?
What is phototropism?
Answers
• When a shoot emerges from the top of a seed
and begins to grow.
• Upwards towards light
• Downwards towards gravity
• Growing towards gravity
• Growing towards light
Higher level questions
• Explain how plant shoots grow towards the
light.(You must include the words Auxin and
elongation in your explanation)
• Explain how plant roots grow towards
gravity.(You must include the words Auxin and
elongation in your explanation)
How shoots grow towards light
• AUXIN moves to the shaded side
• Causes cell elongation
• Shoot bends towards light.
How roots grow towards gravity
• AUXIN moves to the underside of the root
• It Inhibits the elongation of cells on the
underside of the root
• Cells on the upper side continue to elongate
• Root bends downwards