Question

Name the organelle which provides turgidity and rigidity to the plant cell ? Name any two substances which are present in it ? How are they useful in unicelluar organisms?

Answer 1

1)vacuole is the organelle which provides rigidity and turgity to the plant cell.2)    the two substances present in vacuole are water . enzyme and small molecules.3)A contractile vacuole (CV) is a sub-cellular structure (organelle) involved in osmoregulation. It is found predominantly in protists and in unicellular algae. It was previously known as pulsatile or pulsating vacuole.

Answer 2

Answer:

1. Vacuole

2. Water, enzymes, organic acids and carbohydrate molecules

3. Storage, ingestion, digestion, excretion and expulsion of excess water.

Explanation:

1. Vacuole is the organelle which provides turgidity and rigidity to the plant cell. Vacuoles usually act as a storage organelle and also provide structural support to the cell. The solution of the vacuole is different from the solution of cytoplasm since it contains stored food, waste material and enzymes.

2. Vacuoles are membrane-bound cell organelles which are present in the cytoplasm and usually filled with a watery fluid containing various substances.

The substances that are present inside a vacuole are as follows:

• Water
• Enzymes
• Organic acids
• Carbohydrate molecules

3. Importance of vacuoles in unicellular organisms are as follows:

• Vacuoles help in the removal of unwanted structural debris.
• They store all the waste products of cells.
• In Amoeba, food vacuoles store food.
• Isolate materials that might harm to the cell
• Contain waste products
• Maintain internal hydrostatic pressure or turgor within the cell
• Maintain an acidic internal pH
• Export unwanted substances from cell

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