Which of the following is not a characteristic feature of all living organisms?

Question

Accepted Answer

Explanation:

1. **Option 4: Photosynthesis**  
   Photosynthesis is not a characteristic feature of all living organisms. It is a process used by certain organisms, such as plants, algae, and some bacteria, to convert light energy into chemical energy in the form of glucose. However, not all living organisms perform photosynthesis. For example, animals, fungi, and many microorganisms do not have the capability to photosynthesize. They rely on other means of obtaining energy, such as consuming organic matter. Therefore, photosynthesis is not a universal characteristic of all living organisms, making Option 4 the correct answer.

2. **Option 1: Metabolism**  
   Metabolism refers to the set of life-sustaining chemical reactions in organisms. It is a fundamental characteristic of all living organisms, as it encompasses all the processes that occur within a living organism to maintain life, including the conversion of food to energy, the elimination of waste, and the synthesis of necessary compounds. Since metabolism is essential for the survival and functioning of all living organisms, it cannot be considered as the correct answer.

3. **Option 2: Growth**  
   Growth is a characteristic feature of all living organisms. It involves an increase in size and often in the number of cells, which is a result of cell division and enlargement. All living organisms exhibit growth at some stage of their life cycle, whether it is through cell division, increase in biomass, or development. Therefore, growth is a universal characteristic of life and cannot be the correct answer.

4. **Option 3: Reproduction**  
   Reproduction is the biological process by which new individual organisms are produced. It is a fundamental characteristic of all living organisms, ensuring the continuation of a species. While some organisms may not reproduce due to various reasons (e.g., sterility, environmental conditions), the capability for reproduction is inherent in all living organisms. Thus, reproduction is a characteristic feature of life and cannot be the correct answer.

In conclusion, photosynthesis is not a characteristic feature of all living organisms, as it is specific to certain groups. This makes Option 4 the correct answer.