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In the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?


A cell is the basic structural and functional unit of life. Each living cell along with its components like protoplasm and various organelles, has the capacity to perform basic functions of life. If this organisation of a cell is destroyed, then cell will not be able to perform certain basic functions and it may lead to its death in the future.

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A, B, C and D are basic parts of all the cells. The part A contains thread like structures called E which transfer the characteristics from parents to their offsprings into the cell and out of the cell. The part B provides energy to the cell. The part C is found in plant cell but not in animal cell. The part D is a transparent, jelley–like material. What could A, B, C, D and E be?


A : Nucleus
B : Mitochondria
C : Cell membrane
D : Cytoplasm
E : Chromosomes.

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Explain various types of organisms on the basis of number of cells.


There are two types of organisms on the basis of number of cells:

(i) Unicellular : The organisms contain only single cell in the body are called unicellular organisms. For example : amoeba and paramecium.

(ii) Multicellular : The organisms made up of more than one cells, are called multicellular organisms. For example human, tree, dog, etc.

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Why is the plasma membrane called a selectively permeable membrane?


The plasma membrane allows or permits the entry and exists of some materials in and out of the cell. It also prevents movement of some other materials. The cell membrane, therefore, is called a selectively permeable membrane.

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What is an organ system?

(a) Give two examples of organ systems in animals.

(b) Name the two main organ systems in plants.


A group of interconnected organs which works together to do a big job for the organism, is called an organ system.

(a) Various organ systems of animals (including human beings) are Digestive system, Respiratory system, Circulatory system, Nervous system etc.

(b) The plants have two main organ systems : Root system and shoot system.

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