LIFE PROCESSES , Class 10

Mahanand Tudu October 13, 2025

LIFE PROCESSES

INTEXT QUESTIONS

Topic - 1, Life processes



Ans: In multicellular organisms, all the cells may not be in direct contact with the surrounding environment. So, diffusion is insufficient to meet the oxygen requirements of large multicellular organisms.

Ans:- (i) Movement : It is the major criterion . It may be incurred through locomotion (running ,walking etc.), action of body parts (e.g., chewing of cud by cow), breathing , growth ( in plants), maintenance and repair of cellular structures and molecular movement in metabolic reactions.
(ii)Requirement of food for performing life processes.
(iii) Respiration and utilisation of the inhaled oxygen for oxidation of food.
(iv) Display of growth and development.
(v) expulsion of metabolic wastes (Excretion).

Ans: (i)An autotrophic organism (like a green plant) uses outside raw materials such as carbon dioxide, water and minerals alongwith sunlight to make its own food by the process of photosynthesis.
(ii) A hetrotrophic organism (like an animal) uses outside raw materials such as readymade organic food to grow, develop, synthesise proteins and other substances needed in the body.
(iii) Most of the organisms use oxygen (of air) as outside material for breaking down food and releasing energy for themselves in a process called respiration.

Ans: Nutrition, Respiration, Transport, excretion, Control and coordination, Growth, Movement and Reproduction.

Ans: The basic functions performed by living organisms to maintain their life on this earth are called life processes.
The basic life processes common to all the living organisms are;,br>
  • Nutrition
  • Respiration
  • Transport
  • Excretion
  • Control and Coordination
  • Growth
  • Movement
  • Reproduction

Topic - 2, Nutrition



Ans:-
s.no.Autotrophic NutritionHeterotrophic Nutrition
1.Food is synthesised from simple inorganic raw materials such as CO2 and water.Food is obtained directly or indirectly from autotrophs.This food is broken down with the help of enzimes.
2.Presence of green pigments (chlorophyll ) is necessary.No pigment is required .
3.Food is generally prepeared during day time.Intake of food takes place at any time.
4.All green plants and some bacteria have this type of nutrition.All animals and fungi have this type of nutrition.


Ans : CO2 and water are the raw materials required for potosynthesis. Terrestrial plants get CO2 from environment and water from the soil. Aquatic plants take up CO2 that is present in dissolved form in water . Water is simply absorbed by the parts of the aquatic plant submerged in water.

Ans: The acid (hydrochloric acid ) secreted inside the the stomach makes the medium acidic which is necessary for the activation of enzyme pepsin. It converts inactive propepsin into active pepsin.Also, hydrochloric acid kils any bacteria which may enter the stomac along with food.

Ans: Disestive enzymes convert the large and insoluble food molecules into small water soluble molecules in the process of digetion.
For example , pancreas secretes enzymes like amylase, trypsin and lipase. The enzyme amylase breaks down the starch, trypsin breaks down the proteins and lipase breaks down the emulsified fats into simple sugars, amino acids and fatty acids respectively.

Ans : The inner lining of small intestine has millions of tiny finger like projections called villi.The presence of villi gives the inner walls of the small intestine a very large surface area for absorption of digested food.The villi are richly supplied with blood vessels which take the absorbed food to each and every cell of the body.

Topic - 3, Respiration



Ans:
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