Q. 34.0( 10 Votes )

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. (AS 3)

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?

Answer :

a) They float in water due to the presence of air filled spaces in them.

b) Leaf bases of water plants form air filled structures to keep them afloat.

c) Partially submerged plants have numerous air spaces inside the stems leaves, roots that aid in gaseous exchange and buoyancy. This amplifies the buoyant force of the water making them float.

d) NOTE: To draw the diagram you must observe a cross-section of the plant stem under light microscope after staining it with safranin dye. Draw and label all the structures that can be observed.

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