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10th Biology 'Part...1
Class X NCERT-Science
Life Processes Science
Intext Exercise 1
Question 1:
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
Solution 1:
Multicellular organisms such as humans possess complex body design. They have specialised cells and tissues for performing various necessary functions of the body such as intake of food and oxygen. Unlike unicellular organisms, all cells in a multicellular organism are not in direct contact with the outside environment. Therefore, diffusion cannot meet their oxygen requirements.
Question 2:
What criteria do we use to decide whether something is alive?
Solution 2:
Presence of life processes and the presence of a cellular structure is used to determine whether something is alive or not. The important life processes in living organisms are:
Nutrition, respiration, transportation, excretion. control and coordination growth and reproduction
Question 3
What are outside raw materials 1 for by an organism?
Solution 3:
An organism uses outside raw materials mostly in the form of food, water and oxygen. The raw materials are used by the organism for performing important functions in the body and vary according to the complexity of the organism and its environment.
1. Food is used for providing energy and nutrients for the cells in the body
2. Water is the most important medium in which cellular reactions take place. Water is also required for digestion and is the major constituent of blood and protoplasm
3. Oxygen is used for aerobic respiration so as to release energy stored in the food.
Question 4:
What processes would you consider essential for maintaining life?
Solution 4:
Life and control and co-ordination essential for maintaining life are nutrition, respiration, transportation, excretions
