Kafui T
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Report Thread starter 4 weeks ago
#1
Hello,
Please could someone mark this 6-marker, for me
Any help would be welcome

In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate.
Animals and plants have features (adaptations) that allow them to survive in the conditions in which they normally live.
Describe how animals and plants are adapted to survive in dry conditions such as deserts.
For each adaptation that you give, describe how the adaptation helps the animal or plant to survive in dry conditions.
To obtain full marks you should refer to both animals and plants.
(Total 6 marks)

An elephant’s large ears increases its surface area to volume ratio, which allows it to lose more thermal energy. This is made possible because an elephant's ears have a good blood supply, which means that there will be a high rate of vasodilation, which makes it more effective for the elephant to transfer heat out of the blood and into the surroundings. This allows elephants to maintain a cool body temperature, to cope with high temperatures in their dry environment.
Marram grass has physical adaptations, which helps it to reduce water loss from transpiration, with water being a scarce resource in a dry environment. This is because to photosynthesize it needs to access carbon dioxide, which enters into marram grass through the stomata, but doing so has the negative effect of losing water, as the water is evaporated leaving the atmosphere as water vapour. Marram grass have less stomata on their leafs, which means that there will be less opportunities for water to escape from the plant. Also, marram grass has rolled-up. This helps them to trap the water vapour it loses from the stomata, and makes it less susceptible to the wind. The wind is a factor which increases the rate of the evaporation of water, which in turn increases transpiration, so if less wind comes in contact with the plant, the rate of transpiration will be reduced. This in turn, reduces the total amount of water that marram grass loses.
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viol.aaa
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That seems like a very comprehensive answer, I think you fully understand the topic and have addressed all the points in the markscheme. For that reason I’d give you probably 5 or 6. To extend further, could reference camels as a good desert animal example in that they store fat in their humps which can be broken down for metabolic water and energy source - useful in going long periods without food/water. Are you in year 12 or 13? If you’ve studied the kidney, could perhaps link to varying lengths of loop of Henle in animals to prevent water loss. But you’ve talked about loads of good ideas so they would only be extras! Could also mention sunken stomata for the plants, and maybe the keyword of xerophytes? But I’d still probably give full marks as you cover a lot!
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Kafui T
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Report Thread starter 4 weeks ago
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Thank you! I'll consider including the other points, as well.
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