CBSE CLASS 10th Science Chapter 6 Biology Life Processes

Life Processes

Living Being are normally considered beings who show signs of life like breathing, walking etc like Humans, animals etc, in case of plants growth/greenery of the plant is criteria to consider it as alive.

plant that is not visibly growing is still alive, and some animals can breathe without visible movement. So

using visible movement as the defining characteristic of life is not enough.

Cells are the smallest functional and structural unit of our body. They are the sub units of tissues. They perform the function of growth,metabolism,protein synthesis,etc .Group of cells constitute tissues.

Metabolism is a term that is used to describe all chemical reactions involved in maintaining the living state of the cells and the organism. It can be divided into 2 processes, 1. catabolic – the breaking down of compounds (for example, the breaking down of glucose to pyruvate by cellular respiration); or anabolic – the building up (synthesis) of compounds (such as proteins, carbohydrates, lipids, and nucleic acids). Usually, catabolism releases energy, and anabolism consumes energy.

Over the time these cell structures may break so body needs to repair & maintain these cells to keep us alive.

6.1 WHAT ARE LIFE PROCESSES?

To keep human or animals alive cell structures needs to be repaired & maintained, this process requires energy which comes from Food.

Since these maintenance processes are needed to prevent damage and break-down, energy is needed for them. Process of transferring energy from food to inside body is called nutrition.

Glucose(C6H12O6)+O2 à Energy(atp)+H2O+CO2

This reaction takes place in Mitochondria (Power house of cells).

Process of taking oxygen to breakdown food into energy is called respiration.

 

High Energy Molecule is called ATP(Adenosine Tri Phosphate). It stores & releases energy for many cellular processes. It is found in mitochondria. C10H16N5O13P3

If a cell needs to spend energy to accomplish a task, ATP molecule splits of one of its 3 Phosphate becoming ADP(Adenosine Di Phosphate)C10H15N5O10P2. Energy holding that Phosphate is released & available to work for cell.