Living organisms retract on coming in coming with hot object.why ?
Answers
Answer:
Explanation:
We went on a journey through different habitats and discussed many plants and animals. In our previous chapter, "Habitat and Adaption", we listed objects, plants and animals found in different surroundings. Suppose we stop a while and think which examples in our list are living? Let us think of examples from a forest. Trees, creepers, small and big animals, birds, snakes, insects, rocks, soil, water, air, dry leaves, dead animals, mushrooms and moss may be only some of the objects that are present in the forest. Which of these are living?
Think of objects that you can see around you at this moment and group them as living and non-living. In some cases, it is easy for us to know. For example, objects like chair or a table in our homes we know that they are not alive. Paheli was reading this rhyme from Complete Nonsense written by Edward Lear: Paheli and Boojho found the poem so very funny, because they knew that a chair or a table is not alive and it cannot talk, walk or suffer from the usual problems that all of us face.
A chair, table, stone or a coin. We know that they are not alive. Similarly, we do know that we are alive and so are all the people of the world. We also see animals around us that are so full of life — dogs, cats, monkeys, squirrels, insects and many others.
How do we know that something is living? Often, it is not so easy to decide. We are told that plants are living things, but they do not appear to move like a dog or a pigeon. On the other hand, a car or a bus can move, still we consider them as non-living. Plants and animals appear to grow in size with time. But then, at times, clouds in the sky also seem to grow in size. Does it mean that clouds are living? No! So, how does one distinguish between living and non- living things? Do living things have some common characteristics that make them very different from the non-living?
You are a wonderful example of a living being. What characteristics do you have which make you different from a non- living thing? List a few of these characteristics in your notebook. Look at your list and mark those characteristics that you have listed, which may also be found in animals or plants.
Some of these characteristics are perhaps common to all living things.
Do all living things need food?
In Chapters 1 and 2, we learnt that all living things need food and how essential it is to animals and to us. We have also learnt that plants make their own food through the process of photosynthesis. Animals depend on plants and other animals for their food.
Food gives organisms the energy needed for them to grow. Organisms also need this energy for other life processes that go on inside them.
Do all living things show growth?
Does the dress you had four years back, still fit you? You cannot wear it any more, isn’t it? You must have grown taller during these years. You may not realise it, but you are growing all the time and in few more years you will become an adult.
Answer:
Stimulus or response to stimulus
Explanation:
basically nerves send response to spinal cord via myelin sheath, indicating that the object is hot. So, the spinal cord immediately sends the response to retract the part of the body in contact, which can be termed as 'response' to stimuli