B1 Weak Topics

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Suggest a feature that helps to protect the Pompeii worm from the extreme heat in hydrothermal vents
It has a large SA to facilitate heat loss as well as an insulating/fat layer.
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Explain how soil bacteria produce nitrates
Decomposers break down dead animal and plant matter in the soil into Ammonia. Then, Ammonia is converted into nitrates by nitrifying bacteria.
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What is thermoregulation an example of?
Negative feedback
3 of 22
Explain how exercise can cause body temperature to increase
Muscles contract and relax. As well as this, friction causes heat to build up and heat is also released by respiration.
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Define the term drug
A chemical substance that causes psychological/behavioural changes.
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Why is alcohol classed as a depressant?
It increases reaction times, slows down neurotransmission, and slows down the activity of the brain.
6 of 22
Describe the long term effects of alcohol abuse
Liver/Brain/Kidney damage. It can also cause addiction or alcoholism and cirrhosis.
7 of 22
What are the ethics of allowing alcoholics to have an organ transplant
Some say addiction is and illness and alcoholics have caused their own liver to fail. Many also say that other people may deserve the liver more because an alcoholic may start drinking again, damaging the organ.
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Explain why a person with cystic fibrosis may lose body mass.
Mucus blocks the small intestine wall/digestive system. This prevents enzymes from being released, causing less digestion of food and less absorption.
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Explain how Type 1 diabetes can be controlled
Use of a low carbohydrate/healthy diet. They can also increase exercise to lower glucose levels.
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How are impulses transmitted in a reflex arc
Impulses travel along neurones as electrical signals. The message travels from the stimulus, along the axon (insulated by ms) and dendron of the sensory neurone, and to the spinal cord. The reflex arc is important to keep the body safe.
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Describe the main symptoms of sickle cell disease
Swelling of hands and feet, Short of breath/reduced oxygen capacity, and tired/lethargic.
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Explain the relationship between tube worms and chemosynthetic bacteria.
The bacteria convert hydrogen sulphide compounds into food for the tape worms. The tube worms provide a habitat and oxygen for the bacteria. It is an example of a mutualistic relationship.
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What are some characteristics of a dodo bird similar to other Animals
They feed heterotrophically, do not have chlorophyll/cell walls, and are multicellular.
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Suggest why and animal may become extinct
They may have lost their food source, they could have been unable to reproduce. There could have been a change in environmental conditions, or there could have been an increase in competition for food and resources.
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Describe the causes of variation in a population
Genetic variation, Environmental variation, hybridisation/interbreeding, and mutations.
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Explain how stimulants increase neurotransmission
They increase transmission, they cause more neurotransmissions, and they (stimulants) act at the synapse.
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Explain why the temperature of an external body part decreases with temperature.
Heat loss to the environment; less blood is delivered to the skin's surface; vasoconstriction; less heat loss by radiation.
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How can a mosquito spread the disease malaria?
It carries protozoan and transfers protozoan to blood by biting someone.
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Suggest the advantages of a plant with a response of positive gravitropism
It helps to stabilise the plant, anchoring it. It also helps the root to reach water/absorb water/access mineral ions.
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Give one indicator for air pollution
Blackspot fungus on roses.
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What is MRSA?
It is a bacterial infection that is resistant to antibiotics. Antiseptics killed the bacteria for it so less bacteria was transferred from person to person.
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Other cards in this set

Card 2

Front

Explain how soil bacteria produce nitrates

Back

Decomposers break down dead animal and plant matter in the soil into Ammonia. Then, Ammonia is converted into nitrates by nitrifying bacteria.

Card 3

Front

What is thermoregulation an example of?

Back

Preview of the front of card 3

Card 4

Front

Explain how exercise can cause body temperature to increase

Back

Preview of the front of card 4

Card 5

Front

Define the term drug

Back

Preview of the front of card 5
View more cards

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