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1. Why are there numerous small vacuoles in an animal cell while only 1 or 2 large vacuoles are present in a plant cell ?

2. Why are lysosmes called as suicidal bags ?

Ans-1) Plants have single large vacoule as compared to the animals which have many small vacuoles. The main reason behind this fact are as follows: 

Storage: Plants form the base of the food chain. They are capable of converting inorganic matter to organic matter. To store these inorganic ions they are provided with the large vacuoles. Moreover, plants can not move from one place to another. So, it is very easy for a plant to be able to store extra nutrients when they are around for use later when nutrients may not be available.

 Growth: Plant cells grow by swelling. They are provided with a rigid cell wall. To make this wall expand, plant cells fill their vacuoles to exert pressure from inside.

Ans-2) Lysosomes are the membrane-bound vesicles, which contain digestive (hydrolytic) enzymes like acid hydrolase. They digest a variety of substances including worn out organelles, food particles, viruses, and bacteria. They are also known as ‘suicide-bags’ of cells as they burst out and release hydrolytic enzymes in the cytosol, where cells are heavily injured.

@Sanidhya:- Very nice answer, keep contributing!!

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ANS1) Plant cells have a large vacuole due to the amount of water the cell must hold to maintain its shape. The water in the vacuole creates something called turgor pressure. When the vacuole has lots of water, the turgor is high and pushes against the cell wall so the cell is rigid. When vacuole has little water, the turgor is low so the cell is flaccid. 

Animal cells don't have to worry so much since our cells are already in an aqueous environment and get water in lots of other ways.

ANS2) Lysosomes are called the suicidal bags of a cell because when a cell gets damaged or ruptured they secrete enzymes which digest the whole cell. Therefore, killing the cell itself.

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