FSH (Follicle Stimulating Hormone) is produced by the...
In which food chain will the greatest proportion of biomass and energy of the plants be passed to humans?
plants --> sheep --> human
plants --> grasshoppers --> frogs --> trout --> human
plants --> human
Which of the following adaptations would a plant in a hot, dry climate NOT have?
Decreased surface area
Leaves are flat and wide (large surface area) to try and collect as much water as possible
Widespread roots to absorb more water
Fleshy, thick stem to absorb more water
Thick waxy layer to reduce evaporation, water loss and transpiration
Fewer stomata to reduce evaporation, water loss and transpiration
A vaccine prevents infection as it contains dead pathogens which are harmless but still have antigens. White blood cells in your body reproduce rapidly upon re-infection. These antibodies kill pathogens.
A bird makes a nest with air vents. The bird opens and closes the air vents of the nest at different times of the day.
Suggest why the bird opens and closes the air vents.
Opening the vents allows CO2 in
Micro-organisms and eggs need oxygen
Opening allows release of CO2 from respiration of microorganisms
Opening allows heat to come to the eggs
Closing retains moisture
Opening allows the eggs to get used to the sounds of their surroundings
Opening allows the bird to see her eggs
The sex of a megapode bird depends on the temperature at which the egg was kept.
Suggest why megapode birds control the temperature of their nests.
The megapode prefers girls
Maintains sex balance
Which of the following is NOT an adaptation an animal living in hot, dry climates (e.g camel) would have?
Long eyelashes to keep dust out of their eyes
Nocturnal so they reduce sweat loss as they face the heat of the day for fewer hours
Reduced amount of body fat which reduces insulating layer
Small feet so there is a smaller surface to get burned by the hot ground
What does a vaccine contain?
White blood cells to fight pathogens
Why would an animal be adapted to have large ears?
It lives in cold climates so larger ears would mean a larger surface area to have thick fur on, so the animal could trap more hot air to keep it warm.
It lives in hot climates so larger ears would mean a larger surface area : volume ratio so it could lose more heat.
Apart from measles, which two other diseases does the MMR vaccine protect against? (SELECT TWO)
Measles is a virus.
Explain why antibiotics cannot be used to treat measles.
When antibiotics and measels combine, they poison you.
Antibiotics can't kill viruses because viruses have a hard outer layer which antibiotics aren't strong enough to penetrate.
Antibiotics can't kill viruses because viruses live inside cells.
Use Lamark's theory to explain how the elephant's trunk evolved. (It stretched)
The mother stretched its offspring's trunks.
The mother stretched her own trunk during her lifetime and reproduced
The mother asked her offspring to develop longer trunks
Suggest ONE advantage to the population as a whole of children having a second MMR vaccination.
Less chance of spread of disease
Makes vaccine more effective
Makes parents happy
Why do antibiotics become less useful at treating an infection if the antibiotic is overused?
Bacteria develops resistance.
Bacteria develops immunity.
Your body overdoses on antibiotics and it can poison you.
A bird collects dead plants and puts them in their nest. The dead plants in the nest decay. The decaying process helps keep the eggs warm for many weeks.
Micro-organisms respire which releases CO2 and heat
The dead plants and eggs rub against each other, causing friction, which creates heat
Water inside the plants heats up and acts as a hot water bottle
Oestrogen inhibits further production of FSH.
What was thalidomide originally developed to treat?
Using a recreational drug may cause the person to become dependent on the drug. What happens in the body to make someone dependent on a drug?
Changes in chemical processes
Drug tastes nice
Suggest ONE reason which would need to be considered before a legalisation of a drug.
How high it makes you
The long term effects
How expensive it is
How easy it is to mass produce
In the 1800s, many scientists could not decide whether Lamark's theory or Darwin's theory of evolution was the right one.
Give TWO reasons why.
Not enough evidence
Mechanism of inheritance not known
Lamark was not alive so they could not ask him questions
Neither of them had a background in science - Darwin was a gardener and Lamark was a musician.
Plant shoots grow towards light.
This response is called...
What does metabolic rate mean?
The speed at which chemical reactions take place in the body
The rate at which you eat food
The rate at which your body excretes waste
Auxin is a hormone that DOESN'T control...
rate of photosynthesis
Which of the following health problems is NOT associated with obesity?
Type 2 Diabetes
High blood pressure
Sense organs detect...
foreign substances in the bloodstream
FSH stimulates the mature egg to be released from the ovary.
I have written out the 6 steps of a reflex reaction when a bee stings someone's finger.
However, I have added an extra false step.
Select the fake step.
1. Bee stings finger
2. Stimulation of the pain receptor
3. Impulses travel along the sensory neurone
4. Impulses are passed along a relay neurone, via a synapse
5. Impulse travels to the mouth, which produces saliva
6. Impulses travel along a motor neurone
7. When impulses reach muscle, it contracts.
The body carefully controls its internal environment. Which is NOT one of the internal conditions that are controlled?