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Question

Buoyancy in hydrophytes is due to the presence of
  1. spongy parenchyma
  2. chlorenchyma
  3. aerenchyma
  4. collenchyma


Solution

The correct option is C aerenchyma
Parenchyma is an example of a simple permanent living tissue. It has different functions depending on its characteristics.
When there are very large intercellular spaces, it is called aerenchyma. This helps in buoyancy in hydrophytes such as water lily.

Chlorenchyma is parenchyma or collenchyma with chloroplasts in the cells. It helps in photosynthesis.

When there are considerable intercellular spaces in the parenchyma, the type of parenchyma is known as spongy parenchyma. It helps in the exchange of gases and in transpiration.

Collenchyma is an example of a simple permanent living mechanical tissue. The cell wall is made of cellulose, hemicellulose and pectin.

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