Plants and ecosystems
Quiz by Adam Coggins
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- Q1
What is the function of the guard cells on a leaf?
They allow water to condense on the leaf.
They control the size of the stomata.
They prevent bacteria from getting into the leaf.
They help to control the amount of light that enters the plant during photosynthesis.
120s - Q2
Koalas are only found in Southern and Eastern Australia and survive almost solely on eucalyptus, which is toxic to most animals. This means they have little competition for their food. What is the term used to describe an organism like a Koala that lives in a very specific environment?
Users enter free textType an Answer120s - Q3
Identify the products in the photosynthesis reaction
carbon dioxide and water
glucose and water
glucose and oxygen
glucose and carbon dioxide
120s - Q4
Match the shape of the root systems to the function they are adapted to perform.
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Why are plants essential for humans? Identify the two correct answers
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The graph shows that, as the light intensity received by a plant increases, the rate of photosynthesis changes. Which statement about region A on the graph is correct?
The plant cannot photosynthesise any more.
The plant is photosynthesising at its maximum rate.
The plant’s rate of photosynthesis has increased.
The plant’s rate of photosynthesis has decreased.
120s - Q7
An experiment was carried out to investigate the relationship between the rate of photosynthesis and the average amount of sucrose arrival in the roots. The results are displayed in the graph. What pattern does the graph show?
no correlation between the average rate of photosynthesis and the arrival of sucrose in the roots
the arrival of sucrose in the roots was not affected by the average rate of photosynthesis
a negative correlation between the average rate of photosynthesis and the arrival of sucrose in the roots
a positive correlation between the average rate of photosynthesis and the arrival of sucrose in the roots
120s - Q8
How does having tiny hairs on the surface of a desert plant reduce water loss?
The hairs reduce airflow close to the surface of the plant, which reduces the rate of evaporation of water vapour.
The hairs are hollow and allow the storage of water.
The hairs reduce the surface area of the plant, so less water can evaporate.
The hairs act as insulation during the cold desert nights.
120s - Q9
Two students performed an experiment on four identical plants, over two weeks, to see the effect of light in the production of starch. The students then performed a starch test using iodine on one of the plant’s leaves. What colour would each of the leaves have been after the test?
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Why might governments be concerned about farmers using pesticides when growing crops for food? Choose three correct answers.
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Competition for limited resources can lead to one organism surviving while the other dies. If competition can be problematic, which of the following could be a reason why can cattle and sheep survive in the same field?
Sheep and cows are friends
Sheep only eat during the day, whilst cows only eat during the night
They are the same species
Cows tend to eat the courser and thicker grass in pasture land whilst sheep tend to eat the fine grass and plants that are closer to the ground
120s - Q12
What effect does closing the stomata have on a plant?
maximises the rate of photosynthesis, by preventing water loss
limits the rate of photosynthesis, by limiting carbon dioxide availability
limits the rate of photosynthesis by stopping oxygen getting in
increases the rate of photosynthesis by conserving carbon dioxide
120s - Q13
Corn is a very important crop across the world. It is used for many different purposes. Traditionally, corn is sold as human or animal food but it can also be used to make ethanol. Ethanol is used as a biofuel to power machines. Which of the statements is NOT correct?
There is some correlation between increased use of corn for ethanol production and increased corn prices.
There is unlikely to be a link between corn prices and ethanol production from corn
The price from 1979 to 2007 has increased from just over $3 to just under $4.50.
The production of ethanol using corn has increased from 0% in 1979 to 25% in 2007 (or any two correct numbers).
120s - Q14
Stomata allow gases to enter and leave a leaf. However, the plants need to avoid excessive water loss. Choose three features of a leaf that prevent the excessive loss of water vapour.
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The relationship between predators and their prey is very important if an ecosystem is to remain in balance. A typical predator–prey relationship is shown in the graph.
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