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Question

Answer the following question basing on your observations about aquatic plants in the laboratory.
a) Why do they float on water?

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Solution

Aquatic plants float on water because they have buoyancy because of the presence of large air cavities in their parenchyma, and the parenchyma is known as aerenchyma. This makes them float on water.

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Q. Answer the following question basing on your observations about aquatic plants in the laboratory.
a) Are there any other reasons for their floating?

Q. Collect some aquatic plants- cut the leaves and stems. Observe them under microscope and record your observations like air presence / absence of air spaces etc., and answer the below.
a) Why do they float on water?
b) What make them float?
c) Are there any other reasons for their floating?
d) Draw a diagram of what you have observed under microscope?

Q. Why do they float on water?

Question 21

Write the adaptation in aquatic plants due to which

(a) submerged leaves can bend in the flowing water.

(b) leaves can float on the surface of water.

Q. Which of the following adaptations help aquatic plants to float in water?

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