شرح ساينس الصف السادس الابتدائي لغات - الفصل الدراسي الثاني
شرح ساينس سادسة ابتدائي - ترم ثاني
لينك تحميل الملزمة
https://drive.google.com/file/d/13Xhqq9UsmG4qYeKNtMEXigcGtRDO_H3O/view?usp=sharing
لينك تليجرام
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In This Lesson:
We will study some examples of animal and plants adaptations in different environments.
1. Animals:
The following table shows some adaptations of different animals in different environments:
2. Plants:
Plants in desert environment:
Location : Egypt's Western Desert.
Examples: Acacia trees, palms, opuntia, spiny shrubs and grasses.
Adaptations : Most of them are characterized by the following :
Size : Most of them are usually small and herbal.
Roots : Most of them have short extended roots near the Earth's surface to draw (absorb) any available water.
Leaves : Some of them have thick leaves to store water.
Stem : - Some of them have thick stems to store water.
- Some of them have thorns on their stems and branches to keep away
herbivores which means animals that eat plants.
Abiotic Factors and Adaptation
An ecosystem may be :
• Small ecosystem such as:
A small area of land between buildings that contains grass, insects and weeds.
• Large ecosystem such as:
The arctic where:
- Caribou feeds on grasses.
- Wolves hunt caribou and other prey.
Any ecosystem contains:
► From the previous explanation, we can conclude that:
• Ecosystem is an area that contains biotic factors (living organisms) and a biotic
factors (nonliving things) that interact with each other.
• Plants and animals live in the same ecosystem depend on each other to live and reproduce.
► The effect of abiotic factors on the growth of living organisms:
You have learned that light, air and water are basic needs for plant to grow.
Now, let's see how the light which is an abiotic factor can affect the growth of plants.
• Plants respond to the amount of light and dark they receive daily.
• Some flowering plants may (produce) bear fruits when the days are longer than the nights in some environments.
• Light helps in the plant's growth.
• If light is too intense, it may damage the plant's parts and cause their drying or burning.
► The effect of abiotic factors on the adaptation of living organisms:
• Water and light are considered the most important factors for the adaptation of living organisms in their ecosystem.
• Living organisms make adaptation according to the availability or limitation of water and light.
• If living organisms can get water and light, they can survive.
But, if water and light are not available, living organisms can't survive and will die.
Limited resources in the desert:
• Deserts are the most extreme environments on the Earth.
• Deserts may be hot area or cold area.
• All types of deserts have little rainfall.
Hot deserts
• They have little amount of groundwater far below the ground surface.
• Small pools of water are formed inside rocks during rains that falls for short periods of time on deserts.
• Some plants which live in these environments have long roots to get the deep groundwater.
• Other plants have short extended roots near the Earth's surface to catch the smallest drop of dew.
Cold deserts
• Antarctica is a desert biome that its temperatures are cold all the year, where:
- Its temperatures in winter go below freezing (below 0°C).
- Its temperatures in the short summer reach a maximum of 21°C.
Light as an Environmental Factor
The plant's growth is affected by:
1. The intensity (quantity) of light can affect the plant's growth.
2. The duration of light which means the amount of time that a plant is exposed to light affects the plant's growth.
• Some flowering plants may bear fruits when the days are longer than the nights in some
environments.
• But, there are some other flowering plants can grow and produce flowers when the days are shorter than the nights such as Chrysanthemum plant.
بالتوفيق
مستر احمد الباشا