▶️ Answer/Explanation
First, we must convert both measurements to the same units. Since $1\text{ cm} = 10\,000\text{ }\mu\text{m}$, the image length is $5 \times 10\,000 = 50\,000\text{ }\mu\text{m}$.
Now, substitute the values into the formula: $\text{Magnification} = \frac{50\,000\text{ }\mu\text{m}}{5\text{ }\mu\text{m}}$.
This simplifies to $10\,000$, which is expressed as $\times 10\,000$.
Comparing this to the given options, choice (C) is the correct calculation.
✅ Answer: (C)
▶️ Answer/Explanation
Biological organization follows a hierarchy: cells group to form tissues, and tissues group to form organs. A neurone is a single nerve cell, which is the basic functional unit of the nervous system. The brain and the liver are both complex structures made of multiple types of tissues working together to perform specific physiological functions, classifying them both as organs. Row A correctly identifies both the brain and liver as organs and the neurone as a cell.
✅ Answer: (A)
▶️ Answer/Explanation
Stem cells are defined by their unique ability to remain unspecialised, meaning they do not yet have a specific structure or function like a muscle or nerve cell. They maintain their population and growth through mitosis, a process of cell division that results in two genetically identical daughter cells. Meiosis is excluded here because it is strictly for the production of gametes (sex cells) and reduces the chromosome number by half. Consequently, stem cells are the “blank slates” of the body that use mitotic division to either self-renew or differentiate into various specialised cell types.
✅ Answer: (D)