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Figure 2 shows the leaves and flowers of water lily plants (Nymphaea dorata) on a lake - Edexcel - GCSE Biology - Question 2 - 2020 - Paper 1
Question 2
Figure 2 shows the leaves and flowers of water lily plants (Nymphaea dorata) on a lake. (a) Water lilies have stomata on the upper surface of the leaves. Explain w... show full transcript
Worked Solution & Example Answer:Figure 2 shows the leaves and flowers of water lily plants (Nymphaea dorata) on a lake - Edexcel - GCSE Biology - Question 2 - 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 the leaves because the lower surface is submerged in water. As a result, it is not in contact with air, inhibiting gas exchange. Thus, carbon dioxide and oxygen cannot easily diffuse through this surface, limiting transpiration.
Step 2
Step 3
Describe how this sugar is transported from the leaves to the flowers of the water lily.
Answer
The sugar produced in the leaves is transported to the flowers through the phloem. It dissolves in water and is moved by translocation, utilizing active transport to ensure that the energy-rich compounds reach the flowers efficiently.
Step 4
Explain why this non-indigenous plant now covers the whole surface of the lake.
Answer
This non-indigenous plant now covers the whole surface of the lake for several reasons: Firstly, the conditions in the lake are suitable for growth and photosynthesis, as they may mirror those from its native habitat. Secondly, it has outcompeted the native plants for resources. Lastly, the absence of natural herbivores to eat or restrict its growth further contributes to its rapid proliferation.