Problem 98 - Objective Biology for NEET

Question

'Virus', the name means (a) Venom or poisonous fluid (b) Acellular form (c) Non-cellular form (d) The connecting link between living and non-living

Step-by-Step Solution

Answer

The answer is (d) The connecting link between living and non-living.

Step 1: Understand the Choices

Familiarize yourself with the provided options: venom or poisonous fluid, acellular form, non-cellular form, and the connecting link between living and non-living. Each has their specific meaning in the context of biology.

Step 2: Recall Information

Recall the meaning of the term 'Virus' in biology. A virus is a small infectious agent that can only replicate inside the cells of another organism. Viruses can infect all types of life forms, from animals and plants to microorganisms.

Step 3: Choose the Appropriate Answer

By considering the nature of a virus- a non-living entity that exhibit some characteristics of living things when inside a host, it can be concluded that the option (d) The connecting link between living and non-living is the most appropriate answer.

Key Concepts

Infectious Agent

An infectious agent is a fascinating element in biology. It is any microorganism or particle that can cause disease within a host. Viruses fall into this category.
What makes infectious agents so intriguing is their ability to hijack the host's biological machinery. They cannot survive on their own. Instead, they rely on the host to replicate and survive.

• Viruses are much smaller than bacteria and cannot be seen with a standard microscope.
• These agents infiltrate host cells, commandeer the cell's mechanisms, and produce more viral particles.
• Viruses can affect a wide range of hosts, including humans, animals, plants, and even bacteria.

Understanding infectious agents like viruses is key to managing and preventing many diseases.

Non-Cellular

In biology, not all entities are composed of cells. Viruses are a prime example of non-cellular life forms. They are distinct because they lack the typical structure seen in cellular organisms.
Non-cellular structures have unique characteristics:

• Viruses do not have a cellular membrane, nucleus, or any cell organelles.
• They consist mainly of a protein coat, known as a capsid, which encases their genetic material.
• The genetic material can either be DNA or RNA, but not both.

Being non-cellular allows viruses to be incredibly adaptable and to infect various life forms under specific conditions, demonstrating how life can exist beyond the cellular model.

Biology

Biology is the study of living organisms and life processes. It explores the complexities and relationships of life at every level, from the smallest particles to entire ecosystems.
Viruses play a unique role in biology:

• Though not considered living by all biologists, viruses challenge the boundaries of what defines life.
• They are only able to exhibit life-like characteristics when inside a host, where they can reproduce.
• Viruses influence evolutionary processes through horizontal gene transfer among organisms.

This intersection of living and non-living features makes viruses an important subject in the study of biology, helping us understand life's diversity and the delicate balance within ecosystems.