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Amazing Science 7 SB C1.pdfA. Differences between Living and Non-living Things
A. Differences between Living and Non-living Things
As a group, make simple observations in your surroundings! Preferably every groups observe different environments, for example in school grounds, gardens, grassy fields. or fields. You can choose the observation environment according to the conditions where you live. When you observe the environment in the school yard or garden, what do you see? What living things did you find? Maybe you see grass, various ornamental plants, such as aglonema and mother-in-law's tongue or fruit plants in pots, such as guava. You can also find stews, butterflies, snails and koi fish. Apart from that, you can see stones, gravel, new bricks, and flagpoles. What are living things? What are non-living things?
If you observe the environment in the fields, you will also see that there are living things and non-living things. Examples of living things that you can find in the fields are grass, rice,frogs, grasshoppers, dragonflies, and eels. The examples of non-living things that you find are stones, gravel, and soil.
With qualitative observations, can you tell the difference between living things and non-living things? Although there are characteristics that are used to classify something including living things or not, generally the ability to move an object is used as an initial determinant of whether the object is a living thing or a non-living object. Do ants, butterflies and koi fish move? Do the stones, pebbles and flagpoles move? Then, touch the ants, butterflies, koi fish. stone. the pebbles, and the flagpole! Never mind being touched, stews, butterflies, and koi fish are already moving when approached. Then, slowly approach the snail that is releasing its antennae. Touch the snail's antennae! What's the reaction? Touch is one type of stimulus. The movement of animals is a response or reaction to stimuli. Do new, pebbles and flagpoles react when you touch them? Movement and sensitivity to stimuli are two examples of characteristics of living things.
The Importance of Movement
The Importance of Movement
Throughout the day, from waking up until you go back to sleep, you cannot be separated from activities that require movement. Rising from waking up is a motion to make the bed a motion; and going to the bathroom is motion. Motion means a change in position from its original position. In general, movement in humans and animals is easy to observe because they move from place to place.
Generally, movement in plants is difficult to observe. However, you can easily observe the movement of closing the leaves on certain plants such as the shock (Putri shame). The leaves of the shy daughter are touched or exposed to strong vibrations will immediately close.
Sensing The World Around You
Sensing The World Around You
How do you feel when you hold the durian skin? Compare that to what you feel when you hold the skin of apples and kiwis. Is there any difference? The durian skin feels sharp when you hold it, the apple skin feels slippery and smooth, while the kiwi fruit skin feels soft and hairy. It can be felt through your skin. Likewise with temperature and pressure. You can feel the difference in temperature and pressure using your skin. The skin is one of the sense organs. The senses are organs that are sensitive to certain stimuli. Apart from the skin, you have four other senses, namely the eye as the sense of sight, the ear as the sense of hearing, the tongue as the sense of taste, and the nose as the sense of smell.
Animals are also sensitive to stimuli. Pets will come when you call. Earthworms will avoid stimuli in the form of light. That is why earthworms are active at night. The millipede will wrap its body when we touch it. Snails will enter into their shells when we touch. Look for other examples that show that animals are sensitive to stimuli!
what about plants? Although they do not have senses, plants are also sensitive to stimuli. insectivorous plants, such as the venus flytrap are sensitive to stimuli and touch. If a fly lands on its claws, Venus will immediately close its claws to catch the fly. Plant shoots will always grow in the direction of sunlight. it proves that plants are sensitive to light stimuli.
Respiration
Respiration
Watch a sleeping cat! His body seemed to move up and down. This indicates that the cat is breathing. Breathing is the process of taking in air that contains a lot of oxygen and expelling waste products in the form of carbon dioxide and water vapor. Cats and most land animals breathe using lungs.
Although living in water, fish also have the ability to breathe. However, fish are not breathe using the lungs. Fish breathe with gills, fish's mouth is always open to add water containing oxygen (O). After the oxygen is taken, the water is expelled through the gill slit. This released water contains a lot of carbon dioxide (CO). Incoming oxygen is used to oxidize food. The result of food oxidation is energy (energy) used by living things to carry out various life activities, such as moving and growing.
Growth and Reproduction
Growth and Reproduction
Living organisms take time to grow. As living things grow, they increase in body size, weight and number of body cells. Growth is an irreversible and permanent process. It changes your body shapes and functions. Growth rate can be measured by height and weight. In human beings, the stages of growth include infancy, childhood, adolescence, adulthood and old age.
Reproduction also often takes a long time. It means an organism produces offspring and thus, ensures the continuation of their population. All living things reproduce in different ways, Plants, for example, reproduce through seeds, leaves and stems. Can you tell the difference between growth and reproduction?
Nutrition
Nutrition
Excretion
Excretion
B. The Importance of Classification
B. The Importance of Classification
There's a lot going on around you. Did your father like to build or like to tinker with motorcycle or car engines? If your answer is yes, of course your father has carpentry tools and equipment for dismantling machines. How did your father quickly find the tools he needed? Of course, the placement of these tools is not mixed with the kitchen utensils used by the mother. Classification is also done by the mother. Cutlery is placed in special racks for plates, glasses, spoons, and forks. That way, you and other family members can pick up the necessary tools quickly. So, in the house there is a grouping of carpentry tools, kitchen utensils, and eating utensils.
You can see another example of classification when you accompany your mother to the market. For easy buyers. find vegetables to buy, the merchant puts some tomatoes in one box. The merchant also prepared another box containing some carrots. Some cucumbers are also placed in a special place. Placement of tomatoes, carrots, and cucumbers, each in a certain box can be referred to as an act of classifying / classifying. With this classification, traders and buyers can find the items they need more quickly.
How do experts classify living beings? Classification of living beings is done based on similarities and differences in characteristics. Living beings that have similarities are included in a certain group.
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