Biology Organisms & Their Surroundings Part 21 (Living Organisms Respond to Stimuli) Class 6 VI | Summary and Q&A

TL;DR

All living organisms, including humans, animals, and plants, exhibit responses to stimuli in their surroundings.

Key Insights

• 😋 Living organisms display the ability to respond to stimuli in their surroundings, whether it is an electric shock, a predator, or a tempting food item.
• 🐢 Responses to stimuli can be immediate, instinctive reactions or slower, physiological responses.
• 🌱 Stimuli can be external or internal, and all living organisms, including plants, exhibit responsive behaviors.

Transcript

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Questions & Answers

Q: What is a stimulus?

A stimulus is an event or situation that causes a response in a living organism. It can be external, like a loud noise or hot temperature, or internal, like hunger or pain.

Q: How do living organisms respond to stimuli?

Living organisms can respond to stimuli in various ways, depending on the situation. They may exhibit immediate physical reactions, such as jumping or running, or physiological responses, like increased heart rate or release of hormones.

Q: Do all living organisms respond to stimuli?

Yes, all living organisms, including humans, animals, and plants, respond to stimuli in their surroundings. It is a fundamental characteristic of life.

Q: Can plants respond to stimuli?

Yes, plants can also respond to stimuli. They may exhibit responses to stimuli such as touch, light, gravity, or chemical signals. For example, the touch me not plant folds its leaves when touched.

Q: Why do plants bend towards sunlight?

Plants bend towards sunlight because they require light for their photosynthesis process. The shoot system of the plant, including stems, branches, and leaves, aligns towards the direction of sunlight to maximize light absorption.

Q: How do roots respond to gravity?

Roots in plants respond to gravity by growing downwards. The roots always grow towards the Earth's gravitational pull, ensuring that they can access minerals, nutrients, and water from the soil.

Q: Are responses to stimuli always conscious decisions?

No, responses to stimuli are not always conscious decisions. Many responses, especially immediate reactions to danger, are instinctive and occur without conscious thought. However, some responses can also be learned or conditioned over time.

Q: Is response to stimuli a crucial characteristic of living organisms?

Yes, the ability to respond to stimuli is a crucial characteristic of living organisms. It allows organisms to adapt and survive in their environments by avoiding potential harm or maximizing beneficial conditions.

Summary & Key Takeaways

• Living organisms exhibit the ability to respond to stimuli in their surroundings.

• Stimuli can be external factors like electric shocks, predator presence, or hot objects, as well as internal factors like hunger.

• Responses to stimuli can be immediate and instinctive, such as jumping away from an electric shock or running away from a predator.