Problem 106 - Objective Biology for NEET

Question

Assertion: No non living object exhibit metabolism. Reason: Cellular organization is absent in non-living organisms.

Step-by-Step Solution

Answer

The assertion 'No non living object exhibit metabolism' and the reason 'Cellular organization is absent in non-living organisms' are both correct, and the reason correctly explains the assertion.

Step 1: Understanding Metabolism

Metabolism is the set of chemical reactions hold in a living organism to maintain its life. These processes allow organisms to grow and reproduce, maintain their structures, and respond to their environments.

Step 2: Understanding Cellular Organization

Cellular organization refers to the structure and composition of a cell, which is the fundamental unit of life. A cell is organized into various parts to perform different functions necessary for the survival of the organism.

Step 3: Relating Metabolism and Cellular Organization

Metabolism is a characteristic feature of cells where various biochemical reactions take place. These include breaking down substances to generate energy, building up new substances, and processing waste molecules. Thus, cellular organization is a prerequisite for metabolism.

Step 4: Applying the Concept to Non-Living Objects

Due to the absence of cellular organization in non-living objects, these objects do not exhibit metabolism. Non-living things may undergo physical and chemical changes, but they do not have a metabolic system triggered by biochemical reactions.

Step 5: Validating the Assertion and Reason

The assertion stated that 'No non living object exhibit metabolism' is valid since non-living objects lack cellular organizations, they do not undergo metabolic activities. The reason 'Cellular organization is absent in non-living organisms' is also valid and it correctly justifies the assertion, thereby making the relation between the assertion and the reason correct.

Key Concepts

Cellular Organization

Cellular organization is one of the basic principles that define the life of an organism. It refers to how cells, the smallest living units, are structured and organized into an orchestrated arrangement of smaller parts. Each part has a specific role that contributes to the overall functioning of the cell.

To understand cellular organization, let's look at the key components inside a typical cell:

• Nucleus: The control center of the cell, containing genetic material (DNA) and guiding cellular activities.
• Ribosomes: Little factories where proteins are synthesized.
• Cell Membrane: The protective barrier that controls what enters and exits the cell.
• Mitochondria: Known as the powerhouses of the cell, these structures convert nutrients into energy.
• Cytoplasm: The jelly-like substance where various cellular processes occur.

This organized structure is essential for carrying out metabolic processes that involve complex chemical reactions. Each cell component works in sync with others to maintain health and functionality, allowing the organism to survive, grow, and interact with its environment.

Biochemical Reactions

Biochemical reactions are vital processes that occur within all living organisms. They refer to the chemical transformations of molecules inside cells, vital for maintaining life and supporting various biological functions. These reactions are part of metabolism, encompassing anabolic (building up) and catabolic (breaking down) processes.

Here are some key aspects of biochemical reactions:

• Energy Production: Reactions like cellular respiration break down glucose to produce ATP, the energy currency of the cell.
• Synthesis of Molecules: Anabolic pathways create large molecules like proteins and nucleic acids from simpler precursors.
• Enzyme Catalysis: Enzymes are proteins that speed up biochemical reactions without being consumed, ensuring efficiency and control.
• Waste Processing: Biochemical reactions help detoxify harmful substances and facilitate waste removal.

These reactions are crucial for sustaining life processes such as growth, repair, and response to environmental changes. Without biochemical reactions, cells could not perform essential tasks, making them integral to the organism's survival and well-being.

Non-living Objects vs Living Organisms

Understanding the distinction between non-living objects and living organisms is fundamental to biology. One primary difference is the presence of cellular organization and metabolism in the latter, which are absent in non-living objects.

Here are key differences:

• Cellular Structure: Living organisms have cells with organized structures, whereas non-living objects lack cells entirely.
• Metabolism: Metabolic processes, driven by biochemical reactions, occur only in living organisms.
• Growth and Reproduction: Living beings can grow and reproduce, processes governed by cellular division and DNA replication, absent in non-living things.
• Response to Stimuli: Living organisms can sense changes in the environment and respond, while non-living objects cannot.

Non-living objects may undergo physical changes, but these are not internally driven like biological processes. The absence of cellular organization means they cannot support metabolism. As a result, they do not exhibit characteristics associated with life. Recognizing these differences helps us understand what fundamentally characterizes living organisms.