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Figure 1 shows the leaves and flowers of water lily plants (Nymphaea odorata) on a lake - Edexcel - GCSE Biology Combined Science - Question 1 - 2020 - Paper 1
Question 1
Figure 1 shows the leaves and flowers of water lily plants (Nymphaea odorata) on a lake. a) Water lilies have stomata on the upper surface of the leaves. Explain wh... show full transcript
Worked Solution & Example Answer:Figure 1 shows the leaves and flowers of water lily plants (Nymphaea odorata) on a lake - Edexcel - GCSE Biology Combined Science - Question 1 - 2020 - Paper 1
Step 1
Explain why water lilies have no stomata on the lower surface of the leaves.
Answer
Water lilies have no stomata on the lower surface of their leaves because the lower surface is submerged in water and therefore does not come into direct contact with air. As a result, gas exchange cannot occur effectively, as this would limit the intake of essential gases like carbon dioxide and the release of oxygen.
Step 2
Step 4
Describe how this sugar is transported from the leaves to the flowers of the water lily.
Answer
The sugar, sucrose, is transported from the leaves to the flowers of the water lily primarily through the phloem. It is dissolved in water and is moved from source to sink by translocation, utilizing active transport mechanisms to ensure efficient delivery.
Step 5
Explain why this non-indigenous plant now covers the whole surface of the lake.
Answer
This non-indigenous water lily plant now covers the whole surface of the lake because the conditions in the lake are suitable for its growth and photosynthesis. It has outcompeted native plants, as it has adapted well to these conditions, and it has fewer natural herbivores to restrict its growth.