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Ans,30. when cell gets damaged,lysosome may burst and the enzymes digest their own cell. Therefore lysosomes are known as 'Suicide bags' of a cell.

Ans.31 Yes, it is true that cell is a building unit of an organism. In unicellular organisms, all the functions are performed by a single cell. In multicellular organisms, similar group of cells come together to form tissues.

Ans. 32 when our nervous system is functioning properly, soaking in water sends a message through the nerves telling those blood vessels to shrink.

Ans.33 Endocytosis is observed only in animal cells as plasma membrane of animal cells is in direct contact external medium. The plant cells are covered with cell wall from outside.