Problem 147 - Objective Biology for NEET

Question

Assertion: All locomotions are movements but all movements are not locomotion. Reason: Movement is one of the significant features of living beings.

Step-by-Step Solution

Answer

Yes, the assertion is correct as all locomotion is indeed a movement, but not all movements are locomotion. And the reason is correct in stating that movement is a common characteristic of all living beings, including microscopic cellular movements and larger locomotions.

Step 1: Understanding the Terms

Firstly, it's crucial to know what is meant by 'movement' and 'locomotion’. 'Movement' refers to a change in position of a body part or the whole body. 'Locomotion', on the other hand, refers to the movement of an organism from one place to another. Thus, it becomes clear that while all locomotions indicate movement, all movements are not indicative of locomotion.

Step 2: Analyzing the Assertion and Reason

The assertion is correct as all locomotions are indeed movements. For instance, when an organism moves from one place to another, there's a change in its position which is a movement. The reason is also correct as movement, not locomotion, is a common characteristic of all living beings. Both the microscopic movements that happen at a cellular level, and major physical locomotions like walking or jumping, fall under the definition of a movement.

Step 3: Concluding the Exercise

To conclude, the provided assertion and reason are accurate. The assertion correctly states that all locomotion is movement but not vice-versa, and the given reason correctly affirms that movement is one of the significant features of living beings. However, considering that not all living beings show locomotion, it can be confirmed that not all movements can be characterized as locomotion.

Key Concepts

Characteristics of Living Beings

Living beings exhibit certain fundamental characteristics that define life. One of the most distinctive features is movement. Movement is crucial because it shows life in various forms, right from single-celled organisms to complex multicellular ones, such as humans. Besides movement, other characteristics can include

• Growth and Development: Living beings grow over time. They develop from a simple to a more complex form.
• Reproduction: Living organisms have the ability to reproduce, meaning they can generate offspring.
• Response to Stimuli: All living beings can react to their environment – they sense changes and respond accordingly.
• Metabolism: This includes all biochemical reactions occurring within a living organism to maintain life.

While these are some of the fundamental characteristics, movement is especially noteworthy because it encompasses both voluntary activities, like walking, and involuntary ones, like the transport of nutrients at a cellular level.
Movement transcends the simple definition of physical change and delves into sustaining life by showing activity and dynamism within an organism.

Types of Movement

Movement isn't just about traveling from one point to another; it includes various types. Organisms display different movements suited to their form and function. Here's how they can be categorized:

• Locomotion: This is the movement from one place to another. Examples include walking, flying, or swimming.
• Autonomic Movement: Also known as spontaneous or involuntary movement, it occurs without conscious control. It encompasses things like the heartbeat or digestive system movements.

Each type serves a unique role in the organism's life cycle and survival.
Locomotion often implies a visible change in the overall position of the organism, whereas autonomic movements may be internal and may not be visible to the naked eye.
Both types are crucial, as they help in acquiring resources, avoiding danger, and maintaining homeostasis.
Understanding these categories helps us see how vast and complex the concept of movement truly is in the biological context.

Cellular Movement

Digging deeper, movement also happens at the microscopic level. Cellular movement is critical for life and includes small-scale processes that ensure survival and functioning of organisms. At the core, these movements enable cells to

• Grow and divide, crucial for reproduction and healing.
• Transport nutrients and waste materials, ensuring efficient access to resources.

Various mechanisms inside cells, like the cytoskeleton, aid these movements.
The cytoskeleton is a network of fibers that provides structure and helps in cell movement by assisting in the relocation of organelles within cells.
Moreover, cellular movement is pivotal during immune responses where cells move to attack invaders or during development stages when cells migrate to form new tissues.
This type of movement may not be visible to us directly but plays a vital role in sustaining life at the microscopic level, influencing how larger bodies function as a whole. By understanding cellular movement, we gain insight into how life operates on a fundamental level.