Explanation

Chromosomes are made up of:

• Nucleic acid (DNA or RNA)
• Proteins (histones and non-histone proteins)

Explanation

• Meiosis is the process by which sex cells (sperm and egg cells) are divided and gametes are formed during reproduction in humans.
• Meiosis involves two successive cell divisions (meiosis I and meiosis II) that result in four non-identical daughter cells, each with half the number of chromosomes as the parent cell.

Explanation

• Phosphorus-32 is used to study the uptake of phosphorus-containing fertilizers.
• This radioactive isotope helps in tracing and measuring the absorption and movement of phosphorus within plants.

Explanation

The K orbit, also known as the first electron shell.

• It can hold a maximum of 2 electrons.

The L orbit, also known as the second electron shell.

• It can hold a maximum of 8 electrons.

The M orbit, also known as the third electron shell.

• It can hold a maximum of 18 electrons.

Explanation

Explanation

• Fertilization is the process where a male gamete (pollen) fuses with a female gamete (ovule) to form a zygote.
• It develops into a seed and eventually a new plant.

Explanation

• Nitrogen (N2) is the most abundant constituent in air.
• Making up approximately 78% of the Earth's atmosphere.

The correct order of abundance:

• Nitrogen (N2) - 78%
• Oxygen (O2) - 21%
• Argon (Ar) - 0.93%
• Carbon Dioxide (CO2) - 0.04%

Explanation

• 6CO2 + 6H2O → C6H12O6 + 6O2
• This is the correct equation for photosynthesis, where carbon dioxide (CO2) and water (H2O) are converted into glucose (C6H12O6) and oxygen (O2) in the presence of light energy.

Explanation

• Vacuoles are small, membrane-bound sacs found in the cytoplasm of cells, which contain air, liquid, or food particles.
• They play a role in storage, digestion, and maintenance of cellular homeostasis.

Explanation

• When Earth is between the Moon and the Sun.
• It blocks the sunlight from reaching the Moon, casting a shadow on the Moon.
• This is known as a Lunar Eclipse.