Explanation

• In Winter, days become shorter and nights become longer, due to the Earth's axis being tilted away from the Sun.
• Resulting in less direct sunlight reaching the Northern Hemisphere.

Explanation

• Mould is a type of fungus that is a decomposer.
• It breaks down dead organic matter.
• Such as plant material, into simpler compounds, releasing nutrients back into the environment.

Explanation

The life cycle of a bean plant:

• Seed: The plant begins as a seed, containing the embryo and stored food.
• Germination: The seed absorbs water, sprouts, and grows its first roots and leaves.
• Leaf growth: The plant develops its leaves, stems, and roots, and begins to photosynthesize.
• Flowering: The plant produces flowers, which contain the reproductive organs and allow for pollination.

Explanation

The sodium-potassium pump (Na⁺/K⁺-ATPase) actively transports 3 Na⁺ ions out of the cell and 2 K⁺ ions into the cell for each cycle,

For maintaining the electrochemical gradient

Explanation

• Thermal Contraction is the decrease in size (length, area, and volume) of a body due to a decrease in temperature.
• Thermal Expansion is the opposite phenomenon, where the size increases due to an increase in temperature.

Explanation

The pressure of a gas in a container is affected by:

• Temperature (increases with temperature)
• Volume (decreases with increasing volume)
• Density of gas (increases with density)

However, the material of the container does not directly affect the pressure of the gas.

Explanation

• The nucleus is responsible for cell division because it contains chromosomes, which are made up of DNA and proteins.
• Chromosomes carry the genetic information necessary for cell division, growth, and function.

Explanation

• Red stars, also known as red dwarfs, typically have a surface temperature around 3000°C (5400°F).
• This is the coolest temperature range for stars, and it's what gives them their distinctive red color.

Explanation

• Dolphins have a wide audible range that is adapted to their aquatic environment.
• They can hear sounds in the range of 20 Hz to 120,000 Hz, which is far beyond the human audible range.

Explanation

• Security mirrors are typically convex mirrors.

The examples of concave mirrors:

• Cosmetic mirrors (makeup mirrors)
• Dentist mirrors
• Car headlight mirrors