QCM : Biology Fundamentals and Ecosystem Dynamics — 12 questions

Explication

Binomial nomenclature is a standardized system for naming species, established by LINNAEUS, that assigns each species a two-part Latin name, with the genus name first and the species name second, both italicized or underlined.

Explication

In a high sucrose concentration solution, water moves out of the potato cells due to osmosis, causing the cylinders to shrink and undergo plasmolysis. This is because the external solution has a lower water potential, leading to water efflux from the cells.

Explication

The stroma is the site within chloroplasts where the light-independent reactions, or Calvin cycle, occur, synthesizing glucose from carbon dioxide using enzymes and products from the light-dependent reactions. The other options describe functions associated with other parts of the chloroplast or are incorrect.

Explication

Bile secretion occurs during digestion, specifically when fats are being broken down in the small intestine. It is produced by the liver and stored in the gallbladder, released into the small intestine to emulsify fats, which facilitates digestion.

Explication

The left ventricle has a thicker wall than the right ventricle because it needs to generate higher pressure to pump blood throughout the entire body, unlike the right ventricle which only pumps blood to the lungs.

Explication

Theodor Schwann is credited with formulating the cell theory, which includes the understanding of plant tissues such as xylem. This theory laid the foundation for understanding the structural adaptations of xylem vessels, such as their hollow, lignified walls, and pits, which are essential for water conduction in plants.

Explication

The extensive network of tracheoles in insects provides a direct pathway for oxygen to reach tissues and remove carbon dioxide efficiently, which is the cause of their effective gaseous exchange system.

Explication

Aerobic respiration occurs in the mitochondria when oxygen is available, producing carbon dioxide and water as by-products. The other options describe processes that do not occur in mitochondria under oxygen-rich conditions: anaerobic respiration produces lactic acid, fermentation produces ethanol, and photosynthesis is a different process altogether.

Explication

The nephron is the basic structural and functional unit of the kidney responsible for filtering blood, reabsorbing substances, and forming urine. The other options are parts of the urinary system but do not perform the filtration and urine formation functions at the microscopic level.

Explication

Blood sugar regulation mainly involves insulin, which is produced by the pancreatic islets and functions to lower blood glucose levels by promoting its uptake into cells and storage as glycogen.

Explication

Fungi have cell walls primarily made of chitin, a tough polysaccharide, which distinguishes them from plants that have cellulose and lignin in their cell walls.

Explication

Producers, such as plants and algae, synthesize their own food through photosynthesis and form the base of the food chain, providing energy and organic matter for consumers and other organisms in the ecosystem.