Explanation

• A pulley is a simple machine that uses grooved wheels and a rope to raise, lower, or move a load.
• It changes the direction of the force, making it easier to lift or move heavy loads.
• Examples: Raising a load and A flag pulley.

Explanation

Marasmus is a form of severe protein-energy malnutrition, characterized by a lack of sufficient protein and calories in the diet.

It is most commonly seen in children under the age of 5, particularly in developing countries where access to nutritious food is limited.

Marasmus is caused by a severe deficiency of protein and calories, leading to:

• Wasting of muscles and tissues
• Weight loss
• Fatigue
• Weakness
• Poor growth and development

Explanation

• Potato, wheat, rice, corn, and sweet fruits are all rich in carbohydrates.
• Carbohydrates are an important source of energy for the body.

Explanation

Indigestion (also known as dyspepsia) is a common condition characterized by discomfort or pain in the upper abdomen, caused by:

• Eating too much or too quickly
• Consuming spicy or fatty foods
• Drinking alcohol or caffeine
• Stress

Explanation

• Incisor teeth are responsible for biting and cutting food into smaller pieces, making it easier to chew and swallow.
• They are located in the front of the mouth and are designed for cutting and snipping.

Explanation

There are 3 main states of matter:

• Solid (fixed shape and volume)
• Liquid (fixed volume, but takes shape of container)
• Gas (neither fixed shape nor fixed volume)

Explanation

A compound machine is a machine that is made up of two or more simple machines.

A bicycle, a crane, wheel borrow and scissors are examples of compound machines because they are made up of multiple simple machines, such as:

• Wheels and axles (simple machine: wheel)
• Pedals and levers (simple machine: lever)
• Gears and pulleys (simple machine: pulley)
• Inclined planes (simple machine: inclined plane)

Explanation

• A lever is a stiff bar that rests on a support called a fulcrum, which lifts or moves loads.
• The fulcrum is the point where the lever pivots, and it can be used to change the direction of a force or to gain a mechanical advantage, making it easier to lift or move heavy loads.
• Examples: Hammer, crow bar, a pair of pilers and seesaw.

Explanation

• Liquids can be converted into solids by cooling, a process known as freezing or solidification.
• As the temperature decreases, the particles of the liquid slow down and come together, forming a solid.

Explanation

• Plants prepare their food (glucose) through photosynthesis.
• Which requires sunlight, water, carbon dioxide, and chlorophyll.
• Sunlight provides the energy needed to power the photosynthetic process.