Adaptations of Arabian Oryx (Desert Habitat)

White body colour reflects sunlight → keeps the body cool in the desert.

Can survive many days without drinking water → gets water from plants + reduces water loss.

Body temperature can rise safely → less sweating → saves water.

Long sharp horns → protection from predators.

Wide hooves → easy to walk and run on loose desert sand.

• The human skeletal system is made of 206 bones.

• It gives the body shape and support.

• It protects important organs like the brain, heart, and lungs.

• It works with muscles to help the body move.

• Bones store minerals such as calcium.

• Bone marrow inside some bones makes blood cells.

Burning releases exothermic reaction

An exothermic reaction is a chemical or physical process that releases energy, typically as heat, light, or sound, into its surroundings.

A chemical bond is the attractive force that holds atoms, ions, or molecules together to form a compound.

An attractive force is a force that causes objects or particles to move toward each other.

Combustion is a rapid chemical reaction between a substance, called a fuel, and an oxidant, usually oxygen, that releases energy as heat and light, often with a flame.

An oxidant, also called an oxidizing agent, is a chemical substance that accepts electrons from another substance during a chemical reaction.

1. air pollution

air pollution happens when harmful gases dust or smoke mix with the air we breathe

2. water pollution

water pollution happens when dirty or harmful substances mix into water bodies like rivers lakes and oceans

3. land pollution

Land pollution happens when the ground is covered or filled with harmful waste

1. Meaning:Variation means small difference in a species.

   
   

2. Example: All humans are the same species, but we are differ in skin type, hair colour, height etc.

   
   

3. Cause: Variation happens because of the genes.

   
   

4. Types:

   1. Inherited variantion

   2. Environmental Variation

      
      

What are species ?

ANS: Scientist group living organisms in to diffrent kinds , called species .

. A species is a group of organisms that all share the same characterastics .

key word

. classification

. It shows how every type of organism we know of is connected to all the others .

Non-metals are elements that mostly lack the properties of metals and can exist as gases, liquids, or solids. They are usually dull and not shiny, except for some like iodine. Non-metals are generally poor conductors of heat and electricity, with an exception being graphite, a form of carbon that can conduct electricity. Their melting points tend to be lower than metals, and they are brittle, meaning they break easily and cannot be bent or shaped. Chemically, non-metals have high electronegativity and ionization energy, so they tend to gain electrons in reactions, forming negative ions and acidic oxides when combined with oxygen. Non-metals include elements such as carbon, sulfur, iodine, oxygen, and hydrogen. Some non-metals, like carbon, show allotropy, existing in different forms with distinct physical properties, such as diamond and graphite. Non-metals do not exhibit malleability or ductility, unlike metals, and they do not produce metallic bonding which accounts for…

Muscles are soft tissues in the human body made up of special cells called muscle fibers that can contract and relax. They help the body move by pulling on bones through tendons. Muscles are elastic, which means they can contract without breaking and then return to their original shape. There are over 600 muscles in the human body, and together with bones and joints, they allow all kinds of body movements. Muscles also protect our organs and help maintain posture and body stability. They can be divided into three main types: skeletal muscles, which are attached to bones and help with voluntary movements; smooth muscles, found inside organs and responsible for involuntary actions; and cardiac muscles, which are found only in the heart and control heartbeat. The nervous system directs muscles to contract and relax so we can move and perform tasks. Muscle contractions convert chemical energy into mechanical energy…

Plants use water in photosynthesis, the process that makes their food. Inside the leaves, sunlight gives energy to split water into hydrogen and oxygen. The hydrogen combines with carbon dioxide from the air to form glucose—the plant’s food. The oxygen is released into the air. So, without water, plants cannot make energy or grow.

Water also transports minerals and nutrients. The roots absorb water from the soil, and the minerals in the soil dissolve in it. This mixture travels through tiny tubes called xylem all the way up to the leaves. The movement happens because water naturally moves from areas of more water (in the soil) to areas of less water (inside the plant).

Another vital job of water is to keep the plant firm and upright. Each cell in a plant holds water that presses against its walls. This pressure, called turgor pressure, keeps stems and leaves stiff. If…