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

Explanation

• Nephrolithiasis is the medical term for the formation or presence of stones in the kidneys.
• These stones are also called renal calculi.
• Kidney stones commonly form when minerals and salts, such as calcium oxalate, crystallize in the urine.

Last verified on 28-10-2026

Explanation

• The human kidney contains approximately 12–16 renal pyramids.
• Renal pyramids are cone-shaped structures located in the renal medulla, the inner region of the kidney.
• They contain tubules and collecting ducts that help transport urine toward the renal papillae and minor calyces.

Last verified on 28-10-2026

Explanation

• The nucleolus is a dense region inside the nucleus where ribosomal RNA (rRNA) is produced and ribosomal subunits are assembled.
• Ribosomes are responsible for protein synthesis in the cell.

Last verified on 27-10-2026

Explanation

• Pteris is a genus of ferns whose rhizome shows leaf traces and leaf gaps in its vascular system.
• A leaf trace is a vascular strand that extends from the stem or rhizome into a leaf.
• A leaf gap is a region of parenchymatous tissue in the vascular cylinder above the point where a leaf trace diverges.

Last verified on 27-10-2026

Explanation

• Tapetum is the innermost layer of the sporangium wall and provides nourishment to developing spores and pollen grains.
• It supplies nutrients and materials needed for the development of microspores.

Last verified on 27-10-2026

Explanation

• Periblem is the primary meristematic tissue that develops into the cortex of roots and stems.

• Dermatogen develops into the epidermis, the outer protective layer of the plant.
• The traditional histogen theory identifies three primary meristems: dermatogen (epidermis), periblem (cortex), and plerome (stele or central vascular cylinder).

Last verified on 27-10-2026

Explanation

• Compositae, also known as Asteraceae.
• It typically has an inferior, bicarpellary, syncarpous and unilocular ovary containing a single basal ovule.
• After fertilization, the ovule develops into a seed.
• The ovary develops into a dry, one-seeded fruit called a cypsela.
• Sunflower, marigold, and dandelion are common examples of plants belonging to the Asteraceae family.

Last verified on 27-10-2026