شرح ساينس الصف الخامس الابتدائي لغات - الفصل الدراسي الأول
شرح ساينس خامسة ابتدائي - ترم أول

لينك تحميل الملزمة
https://drive.google.com/file/d/1bo_OwZpqSP9lj3_FJFP5vTP2mNemoBMb/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This Lesson:
How do we get energy?
▌Food and the oxygen we breath provide us with energy that we need throughout the day.
▌We need energy to do all activities in our daily life such as thinking, breathing and moving.
▌ There are some activities require a lot of energy such as hard work or doing exercises.
▌Our bodies still use some energy even when we sleep.

The primary source of energy
The Sun is the primary source of energy for all organisms on Earth to live, grow and carry out life processes.

How plants get energy from the environment:
▌Plants can make their own food through photosynthesis process by absorbing the sunlight through their leaves and use the sun's energy to convert water and carbon dioxide gas into glucose sugar.
▌Glucose sugar is the food of plants that provides them with energy.


How animals get energy from the environment:
• Animals cannot make their own food, but they get energy from the environment in which they live.

• Different animals can get their food by:
- Eating plants only.
- Eating other animals that eat plants.


 
Food Chains
• Living organisms can be classified into three groups according to their way of feeding, which are:
 Producers.  Consumers.  Decomposers.

Producers:
They are organisms that can make their own food and don't feed on other plants or animals.
Example: Plants use energy from the Sun to produce their own food by photosynthesis process

Consumers:
They are organisms that eat other living organisms to get their energy, because they cannot make their own food.

Primary consumers
- They are animals that eat plants.
- Many insects are primary consumers.

Secondary consumers
- They are animals that eat the primary consumers.
- Birds are secondary consumers, because they eat insects and other organisms that eat plants.

Tertiary consumers
- They are animals that eat the secondary consumers.
- Tertiary consumers are often large meat-eating animals like alligators.

Decomposers:
They are organisms that carry out the process of decomposition by breaking down or decaying dead organisms.
From the previous explanation, we can conclude that:
• The flow of energy through an ecosystem can be represented using model known as a "food chain".

Food chain:
It is a model that shows how energy passes from one organism to another in an ecosystem.
.From the above example, we can conclude that energy passes from one living organism to another through a food chain, where:
- Producers are considered as the first link in any food chain.
- Consumers (primary, secondary, and tertiary) are considered as the second link in any food chain.
- Decomposers are considered as the final link in any food chain.
Energy Flow
Example of a food chain
1. A green plant makes its own food using energy from sunlight.
2. A mouse eats the green plant to get energy.
3. Then a snake eats the mouse to get energy.
4. Then a hawk eats the snake to get energy.



we can form a food chain that shows the relationship among the previous living organisms as follows:


Predator and prey
In the previous food chain, we can observe that :
- The hawk and the snake are "predators", because they hunt other animals.
• The snake and the mouse are "preys", because they are hunted by other animals for food.


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