علوم الصف الثالث تغيرات في النظام البيئي

Birds build nests to provide a safe and secure place for their offspring. Nests protect the eggs and young birds from predators and harsh weather conditions. They also provide a comfortable and warm environment for the young birds to grow and develop. Nests are carefully constructed using a variety of materials such as twigs, leaves, grass, and feathers. The design and location of the nest may vary depending on the bird species. Overall, building nests is an instinctive behavior in birds that ensures the survival and well-being of their young.

The statement "تغير المخلوقات البيئة لتلبية حاجاتها" translates to "Organisms change their environment to meet their needs." This statement is correct because many organisms have the ability to modify their surroundings in order to obtain resources, create suitable habitats, or protect themselves from predators. Examples of such behaviors include building nests, burrows, or webs, as well as modifying their physical appearance or behavior to better adapt to their environment.

The given correct answer is "التلوث" (pollution). The question is incomplete and not readable, but based on the options provided, it can be inferred that the question is asking for a term that refers to the entry of harmful substances into water, air, or the environment. "التلوث" is the Arabic term for pollution, which accurately describes the concept of harmful substances contaminating natural resources.

When the remaining number of individuals of a living creature becomes "قليلاً" (few), it is considered a threat to extinction. This implies that the population size is critically low, and if it continues to decrease, the species may become extinct.

استخدام الشيء مرات ومرات يسمى "إعادة الاستخدام".

الحرائق هي واحدة من الكوارث الطبيعية التي يمكن أن تسببها الصواعق. عندما تصيب الصاعقة شجرة أو نباتًا ما، قد تتسبب في اشتعال النار وانتشارها في المنطقة المحيطة. قد تتسبب الحرائق في تدمير النباتات والأشجار والحيوانات والممتلكات، وتشكل خطرًا على البشر والبيئة.

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The given answer "الموارد" (resources) is correct because the statement mentions the essential needs of humans and living organisms, which include water, air, food, shelter, and sunlight. These needs are considered resources that are necessary for survival and well-being.

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The correct answer is "الفيضانات" (Floods). The image represents a natural disaster characterized by a large amount of water overflowing onto normally dry land. Floods can occur due to heavy rainfall, melting snow, dam failure, or tidal waves. They can cause significant damage to infrastructure, homes, and the environment, as well as pose a threat to human lives.

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The statement is saying that fungi and bacteria cause significant changes in the soil, forming fertilizer that plants use for growth. This is a correct statement as fungi and bacteria play a crucial role in decomposing organic matter in the soil, releasing nutrients that plants can absorb and use for their growth.

The correct answer is "الترشيد" which means "conservation" or "efficiency" in English. This term refers to reducing the use of something, whether it's resources, energy, or any other item, in order to minimize waste and maximize efficiency. It involves finding ways to optimize the use of resources and ensure their sustainable use.

غزال الريم هو الجواب الصحيح لأنه يعتبر من المخلوقات الحية المهددة بالانقراض. يواجه غزال الريم تهديدًا جديًا لبقاءه في الطبيعة بسبب الصيد غير المشروع وتدمير المواطن الطبيعية التي يعيش فيها. تتطلب حماية هذه الحيوانات المهددة جهودًا مستمرة للحفاظ على موائلها الطبيعية وتنظيم الصيد وتوعية الناس حول أهمية الحفاظ على التنوع البيولوجي.

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الجفاف هو من الكوارث الطبيعية التي تنتج عن انحباس الأمطار مدة طويلة. عندما تتوقف الأمطار لفترة طويلة في منطقة معينة، يقل توفر المياه والرطوبة في التربة، مما يؤدي إلى نقص في الموارد المائية وتأثير سلبي على النباتات والحيوانات والبشر في تلك المنطقة. يمكن أن يؤدي الجفاف إلى نقص المياه الصالحة للشرب ونقص المحاصيل الزراعية، مما يؤثر على الأمن الغذائي والاقتصاد والحياة اليومية للسكان.

صراع المخلوقات الحية على الموارد يسمى "التنافس". هذا يشير إلى المنافسة بين الكائنات الحية للحصول على الموارد المحدودة مثل الغذاء والماء والمساكن. في بيئة محدودة، يتنافس الكائنات الحية مع بعضها البعض من أجل البقاء والاستمرار في الحياة. يعتبر التنافس طبيعياً وضرورياً لتنظيم توازن النظام البيئي وتحقيق البقاء لأقوى الكائنات.

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Natural disasters can have devastating effects on the environment and human lives. Drought, floods, and wildfires are all examples of natural disasters. Drought occurs when there is a prolonged period of abnormally low rainfall, leading to water scarcity and crop failure. Floods occur when there is an overflow of water onto normally dry land, causing damage to infrastructure and displacement of people. Wildfires are uncontrolled fires that spread rapidly through vegetation, destroying forests and homes. These natural disasters can result in significant loss of life, destruction of property, and disruption of ecosystems.

When a plant absorbs water from the soil, it causes a slight change.

This statement is incorrect. Bacteria do not break down leaves and animal remains and convert them into air. Instead, the process of decomposition is carried out by fungi and other decomposers, such as worms and insects. Bacteria play a role in the decomposition process by breaking down organic matter into simpler compounds, but they do not directly convert it into air.

The given question is asking for the term used to describe the process of creating new products from old resources. The correct answer is "التدوير" which translates to "recycling" in English. Recycling involves collecting and processing materials that would otherwise be thrown away as trash and turning them into new products. This process helps to conserve resources, reduce pollution, and minimize waste.

The given statement in Arabic translates to "The spider weaves a web to host insects." The correct answer is "صح" which means "true" in Arabic. This answer confirms the statement's accuracy, implying that spiders indeed weave webs to catch and host insects.

The statement is false. The presence of animals in an environment does not necessarily lead to an increase in plant growth around them. The growth of plants depends on various factors such as sunlight, water availability, soil nutrients, and competition with other plants. While animals can contribute to plant growth indirectly through processes like pollination and seed dispersal, their presence alone does not guarantee an increase in plant population.

Animals compete with each other for resources such as water, air, and food. These resources are essential for their survival and reproduction. Therefore, it is possible for animals to compete for water, air, and food.

Plants die when they are exposed to prolonged drought because they are unable to move to another place. Unlike animals, plants are rooted in the ground and cannot physically relocate themselves to a more suitable environment with sufficient water. Therefore, they rely on their ability to absorb water from the soil through their roots. When there is a lack of water for an extended period, plants are unable to survive and eventually die.