Explanation

• Apoptosis is programmed cell death.
• It is a natural process in which the body removes old, damaged, or unwanted cells in a controlled manner.
• Apoptosis plays an important role in embryonic development, such as removing the cells between developing fingers and toes.
• This process helps maintain healthy tissues and prevents damaged cells from surviving unnecessarily.

Last verified on 28-10-2026

Explanation

• Condensation reaction is a chemical reaction in which two molecules join together by removing a small molecule, usually water.
• When monomers join through this process, they can form larger molecules called polymers.

Additional information:

• Hydrolysis is the reverse process, in which water is used to break a chemical bond.

Last verified on 28-10-2026

Explanation

• Spirometry is a pulmonary function test used to measure the volume of air inhaled and exhaled and the rate of airflow.
• The test is performed using an instrument called a spirometer.
• Spirometry is commonly used to help diagnose and monitor respiratory diseases such as asthma and chronic obstructive pulmonary disease (COPD).

Last verified on 28-10-2026

Explanation

• Diffusion is the movement of particles from a region of higher concentration to a region of lower concentration due to their random motion.
• Diffusion is a passive process, meaning it does not require cellular energy (ATP).

Additional information:

• Osmosis is the movement of water through a selectively permeable membrane from a region of higher water potential to lower water potential.

Last verified on 28-10-2026

Explanation

• The secondary cell wall develops between the plasma membrane and the primary cell wall after the cell has stopped or largely completed its expansion.
• It is deposited on the inner side of the primary cell wall.
• It often contains cellulose, hemicellulose, and lignin.
• Lignin makes the secondary cell wall stronger and more rigid, providing mechanical support to the plant.

Last verified on 28-10-2026