“The Knowledge Library”

Knowledge for All, without Barriers…

An Initiative by: Kausik Chakraborty.
05/12/2022 9:20 AM

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Biology Objective Questions On Different Branches🟢Cell Biology Objective Questions (कोशिका एवं कोशिका विभाजन का वस्तुनिष्ठ प्रश्न)🟢Objective Questions and Answers: Animal Tissue(जन्तु ऊतक) 🟢Objective Questions and Answers Digestive system(पाचन-तंत्र) 🟢Objective Questions and Answers Human Blood (मानव रक्त) Part-1🟢Objective Questions and Answers Human Heart (मानव हृदय) 🟢Objective Questions and Answers Excretion system (उत्सर्जन तंत्र) 🟢Objective Questions and Answers Nervous system (तंत्रिका तंत्र) 🟢Objective Questions and Answers Skeleton system (कंकाल तंत्र)🟢 Objective Questions and Answers Endocrine system (अंतःस्रावी तंत्र)🟢Objective Questions on Mineral Resources of India and World (भारत और विश्व के खनिज संसाधन)🟢MCQ On Energy Resources (ऊर्जा संसाधन वस्तुनिष्ठ प्रश्न)🟢Objective Question on Industry of India (भारत के उद्योग)🟢Objective Question on Multipurpose Projects of India (भारत के बहुउद्देशीय परियोजना)🟢Objective Question on Rivers of India (भारत की नदियाँ)🟢Objective Question on National Park and Wildlife Sanctuary in India(राष्ट्रीय उद्यान तथा वन्य जीव अभयारण्य)🟢Objective Questions on Soils of India (भारत की मिट्टियाँ)🟢Objective Questions on Agriculture of India (भारत की कृषि)🟢Objective Questions on Indian Mountains and World Mountains (भारतीय पर्वत और विश्व के पर्वत)🟢Objective Questions on Natural Vegetation of India and World

“The Knowledge Library”

Knowledge for All, without Barriers…

 

An Initiative by: Kausik Chakraborty.
Biology Objective Questions On Different Branches🟢Cell Biology Objective Questions (कोशिका एवं कोशिका विभाजन का वस्तुनिष्ठ प्रश्न)🟢Objective Questions and Answers: Animal Tissue(जन्तु ऊतक) 🟢Objective Questions and Answers Digestive system(पाचन-तंत्र) 🟢Objective Questions and Answers Human Blood (मानव रक्त) Part-1🟢Objective Questions and Answers Human Heart (मानव हृदय) 🟢Objective Questions and Answers Excretion system (उत्सर्जन तंत्र) 🟢Objective Questions and Answers Nervous system (तंत्रिका तंत्र) 🟢Objective Questions and Answers Skeleton system (कंकाल तंत्र)🟢 Objective Questions and Answers Endocrine system (अंतःस्रावी तंत्र)🟢Objective Questions on Mineral Resources of India and World (भारत और विश्व के खनिज संसाधन)🟢MCQ On Energy Resources (ऊर्जा संसाधन वस्तुनिष्ठ प्रश्न)🟢Objective Question on Industry of India (भारत के उद्योग)🟢Objective Question on Multipurpose Projects of India (भारत के बहुउद्देशीय परियोजना)🟢Objective Question on Rivers of India (भारत की नदियाँ)🟢Objective Question on National Park and Wildlife Sanctuary in India(राष्ट्रीय उद्यान तथा वन्य जीव अभयारण्य)🟢Objective Questions on Soils of India (भारत की मिट्टियाँ)🟢Objective Questions on Agriculture of India (भारत की कृषि)🟢Objective Questions on Indian Mountains and World Mountains (भारतीय पर्वत और विश्व के पर्वत)🟢Objective Questions on Natural Vegetation of India and World

“The Knowledge Library”

Knowledge for All, without Barriers……….
An Initiative by: Kausik Chakraborty.

The Knowledge Library

What Makes Something Alive?

Look around you. Do you see anything that’s alive? You’re alive, of course, as are any friends of family members you can see. Do you see an animal? How about a plant? These things are alive, too. But what about the soil that plant lives in? The food in your lunch box? Are these things alive?

At first glance, it may seem pretty easy to determine what’s alive and what’s not. However, when we look a bit closer, it can become more difficult. Consider the tiniest things in our world. Are electrons alive? How about viruses and bacteria?

Even scientists disagree about what it means for something to be alive. NASA defines life as “a self-sustaining chemical system capable of Darwinian evolution.” Some experts get a little more specific—they lay out seven properties of life.

What are these properties? The first is organization. That means that living things are made of cells. To be alive, something must have specialized parts that all do their own job. Second, living things must have metabolism. This includes all the biochemical reactions that take place in something that is alive.

The third property is homeostasis. That means that living things regulate the conditions inside their bodies. Living things also experience growth. They reproduce in some way, although this can take many forms. Living things must give response to changes in their environment. Finally, the last property of life is evolution. Living things must be able to change over time.

Not all experts agree with these properties of life. After all, it’s pretty easy to find examples that don’t fit. Consider the mule. Like most animal hybrids, it can’t reproduce. However, most people would consider the mule to be alive. Still, the properties of life provide a starting point for understanding what makes something alive.

There are still many questions to answer. For example, what about viruses? Experts disagree over whether they are living things. Some claim the answer is no because viruses can’t reproduce without help from a host cell. They also aren’t made of cells. Others disagree, as viruses do have many of the other properties of life.

How about life on other planets? Will it look like life on Earth? Most likely not. That means those searching for alien life have to keep open minds about what makes something alive. Our understanding of this will probably continue to develop as humans explore deeper into the universe.

What do you think? Would you classify viruses as living things? Do the properties of life seem right to you? What do you think alien life could look like? Human beings are still searching for solid answers to these questions and many more.

 

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