Explanation

The nucleolus synthesizes rRNA (ribosomal RNA), which combines with proteins to form ribosomal subunits.

These subunits later form complete ribosomes in the cytoplasm for protein synthesis.

Explanation

Observation is the second step where scientists collect facts using senses or tools.

It leads to forming a hypothesis, a possible explanation to be tested.

The Steps of the Biological Method:

1. Recognition of a problem
2. Observation
3. Hypothesis formation
4. Deduction
5. Experimentation
6. Data collection and analysis
7. Conclusion
8. Theory/law formation (if repeatedly confirmed)

Explanation

Glucose is a small sugar molecule, a simple carbohydrate, not a macromolecule.

Proteins, sucrose (a disaccharide), and fatty acids are larger or complex molecules often considered macromolecules or part of them.

Explanation

Micro molecules (or small molecules) have low molecular weight, like glucose or amino acids.

Macromolecules are large molecules like proteins, carbohydrates, and nucleic acids.

Explanation

A hypothesis is a proposed explanation or possible answer to a scientific problem.

Data are facts collected.

Conclusion is the final decision after analysis.

Explanation

• Rana tigrina, also known as the Asian giant toad or the Indian bullfrog.
• It is a species of frog found in Southeast Asia and the Indian subcontinent.

Explanation

Abdul Qasim Ali Zahravi, also known as Al-Zahrawi, is considered the father of modern surgery.

He wrote the influential medical encyclopedia Al-Tasrif, which included surgical techniques.

Explanation

New cells arise from pre-existing cells through cell division (mitosis or meiosis), as stated in the cell theory.

Old cells do not form from division; they are the parent cells that divide.

Explanation

Discoverer of Cell: Robert Hook

Robert Hook described the cell as: Basic unit of life

Explanation

Deserts have harsh conditions (extreme temperatures, low water), supporting fewer species.

This results in lower biodiversity compared to forests or grasslands.