Class 10 Life processes notes
Very Short Answer Type Questions:
- What do you understand by life processes?
- What is nutrition?
- What is respiration?
- What is excretion?
- The molecules in food are usually based on which element?
- Answer: The processes which are essential to maintaining life are called life processes.
- Answer: The process of taking in and utilising food by an organism is called nutrition.
- Answer: The process of taking in and utilising oxygen to produce energy from carbon-based molecules is called respiration.
- Answer: Removal of waste substances from the body is called excretion.
- Answer: Carbon
Fill in the blanks:
- Locomotion is seen in animals but not in ………………….
- ………………movements in living beings are not perceptible to naked eyes.
- ………………..of broken molecules with new molecules is necessary to continue life.
- For an individual organism, the source of energy comes from ……………the body.
- ……………………..reactions are the most common reactions to produce energy in the body.
- Answer: Plants
- Answer: Molecular
- Answer: Replacement
- Answer: Outside
- Answer: Oxidation-reduction
Write True/False for the following:
- Reproduction is not considered as life processes.
- Lack of observable movement means the absence of life.
- Virus behaves like non-living when it outside the host cell; because it shows no molecular movement in that case.
- Oxygen is the main source of energy for living beings.
- Harmful substances quickly need to be removed from the body.
Answer: 1 → T, 2 → F, 3 → T, 4→F, 5 → T
Short Answer Type Questions:
- Which are the obvious signs of life in big animals?
- Why do we see different modes of nutrition in different organisms?
- Why do complex organisms need an elaborate system of transportation?
- Answer: Big animals show any obvious signs of life. A big animal shows locomotion, i.e. movement from one place to another. This is a clear sign of life in them. Breathing in big animals is easily observable. This is another obvious sign of life in such animals.
- Answer: Organisms differ in terms of complexity in structure. Based on this, different organisms need different kinds of food. Different food needs to mean that there would be different modes of nutrition in different organisms.
- Answer: Unlike unicellular organisms, diffusion cannot be enough to ensure availability of food in every part of a complex organism. Similarly, diffusion cannot be enough to ensure availability of oxygen in every part of a complex organism; because diffusion can only facilitate transport of substances to a short distance. Complex organisms have a separate system for intake of food and another separate system for intake of oxygen. For supplying food and oxygen to different parts of the body, there is a need for an elaborate system of transportation in complex organisms.
Conservation of natural resources:
Human’s Eye and Colourful World