Explanation

• In a gas, the particles have no regular pattern and have large empty spaces between them.
• The particles are widely spaced and are free to move in any direction, with no fixed position or arrangement.

Explanation

• Coleoptile is a protective sheath that covers the emerging plumule (shoot) in grasses, including maize (Zea mays).
• It is a characteristic feature of monocotyledonous plants, particularly in the family Poaceae (grass family).

Explanation

• Birds are a group of animals that lay eggs, are warm-blooded, have either a beak or bill, have feathers on their body, and have a tail, two legs, and two wings.
• Examples: sparrows, eagles, robins, and ostriches.

Explanation

• Insulators are materials that resist the flow of electricity, such as rubber, glass, wood, and plastic.
• They have a high resistance to electric current and are used to prevent the flow of electricity.

Explanation

When you put sand, salt, and sawdust in a glass of water, the following things happen:

• Salt dissolves in water, meaning it breaks down into individual particles that are distributed evenly throughout the water.
• Sand sinks to the bottom of the glass, because it is denser than water and cannot float or dissolve in it.
• Sawdust floats on top of the water, because it is less dense than water and is able to remain suspended on the surface.

Explanation

• If the number of frogs increases, it is likely that the number of snakes would decrease.
• This is because snakes are predators that feed on frogs, and an increase in frog population would lead to a decrease in snake population due to competition for resources and potential overgrazing.

Explanation

Iron is an essential mineral that plays a crucial role in:

• Producing red blood cells (hemoglobin)
• Oxygen transport (binding to oxygen in lungs and releasing it to tissues)
• Energy conversions (supporting cellular metabolism)

Explanation

• Fat provides approximately twice as much energy as the same amount of carbohydrate.
• This is because fat contains approximately 9 kcal/g (kilocalories per gram).
• Carbohydrate contains approximately 4 kcal/g.

Explanation

• Plants absorb Carbon Dioxide (CO2) during the daytime through tiny openings on their leaves called stomata.
• They use this carbon dioxide, along with water (H2O) and light energy from the sun, to produce glucose (C6H12O6) and oxygen (O2) through the process of photosynthesis.

Explanation

Temperature, pressure, and humidity can also have secondary effects on the speed of sound in a medium,

density and elasticity are the primary factors.