Exploring the Wonders of Science

What is the basic unit of life in all living organisms?

• Organism

• Tissue

• Molecule

• Cell

What is the law of conservation of mass in a chemical reaction?

• Mass can be created in a chemical reaction.

• The total mass remains constant in a chemical reaction.

• Mass is only conserved in physical changes.

• The total mass increases during a reaction.

State Newton's first law of motion.

• An object will accelerate unless a force is applied.

• An object will remain at rest or in uniform motion unless acted upon by an external force.

• An object will remain in motion only if it is in a vacuum.

• An object will change direction only if a force is applied.

What is the role of DNA in heredity?

• DNA is only found in the nucleus of a cell.

• DNA is responsible for producing energy in cells.

• DNA is the hereditary material that transmits genetic information from parents to offspring.

• DNA has no role in the transmission of traits.

Define an ecosystem and give an example.

• An urban ecosystem.

• A desert ecosystem.

• A forest ecosystem.

• A marine ecosystem.

What is the difference between prokaryotic and eukaryotic cells?

• Prokaryotic cells lack a nucleus and membrane-bound organelles, while eukaryotic cells have both.

• Prokaryotic cells contain membrane-bound organelles, while eukaryotic cells do not.

• Eukaryotic cells are always smaller than prokaryotic cells.

• Prokaryotic cells have a nucleus, while eukaryotic cells do not.

Explain the process of photosynthesis in plants.

• Plants use photosynthesis to absorb nutrients from the soil and release carbon dioxide.

• Photosynthesis is the process of plants growing without any light or water.

• Photosynthesis occurs only at night when plants absorb carbon dioxide.

• Photosynthesis is the process by which plants convert light energy into chemical energy, producing glucose and oxygen from carbon dioxide and water.

How do dominant and recessive alleles affect traits in offspring?

• Dominant alleles express traits over recessive alleles, which only express when two recessive alleles are present.

• Traits are determined solely by environmental factors, not alleles.

• Dominant alleles can only be expressed in homozygous conditions.

• Recessive alleles always express traits regardless of dominance.