Explanation

• Sound travels slowest in air, with a speed of approximately 343 meters per second (m/s) at 20°C.
• This is because air is a gas and has a low density and stiffness, which allows sound waves to propagate more slowly through the material.

The speeds of sound in different materials:

• Air: 343 m/s
• Water: 1433 m/s
• Wood: 3300-3600 m/s
• Brick: 4176 m/s
• Steel: 6100 m/s
• Diamond: 12000 m/s

Explanation

• The number shown above the symbol of an element is called the atomic number (Z).
• It represents the number of protons in the nucleus of an atom.

Explanation

• Asexual reproduction is a type of reproduction where only one parent is involved, and offspring are produced without the fusion of gametes (sex cells).
• This means that the offspring are genetically identical to the parent.

Explanation

• Cross-Pollination is the transfer of mature pollen grains from the anther of one flower to the stigma of a flower on another plant of the same or different species.
• This means that the pollen is transferred between different plants, allowing for genetic diversity and increased fertility.

Explanation

• Transpiration is the process by which water is transported through the plant and evaporates from the aerial parts.
• Such as leaves, stems, and flowers, primarily through small openings called stomata.

Explanation

Root hairs are tubular outgrowths of root cells that increase the surface area for absorption of water, salts, and minerals from the soil.

Explanation

• A plane mirror produces an image that is the same size as the object.
• The mirror doesn't magnify or reduce the image, it simply reflects it.

Explanation

• Transmission occurs when light passes through a substance without being absorbed, reflected, or refracted.
• The light wave maintains its intensity and direction as it travels through the substance, emerging unchanged on the other side.

Explanation

• An element is a substance that consists of only one type of atom and cannot be further split up into simpler substances by chemical reactions.
• Examples: hydrogen (H), carbon (C), oxygen (O), and iron (Fe).

Explanation

• Carbon Dioxide (CO2) is the gas used to produce energy in the form of glucose during photosynthesis.
• CO2 is the source of carbon atoms, which are used to synthesize glucose and other organic compounds during photosynthesis.