1. What is the difference between a plant cell and an animal cell?
Answer:
Plant cells have a cell wall, chloroplasts, and a large central vacuole, which help in
photosynthesis and maintaining structure.
Animal cells lack a cell wall and chloroplasts but contain centrioles and lysosomes. Both
have a nucleus, mitochondria, and cell membrane.
2. Explain photosynthesis in one paragraph.
Answer:
Photosynthesis is the process by which green plants convert sunlight, water, and carbon
dioxide into glucose and oxygen. It occurs mainly in the chloroplasts using chlorophyll.
This process provides energy for the plant and oxygen for the atmosphere.
3. What is the difference between elements, compounds, and mixtures?
Answer:
Element: A pure substance made of only one type of atom (e.g., Oxygen).
Compound: A substance formed when two or more elements chemically combine in
fixed ratios (e.g., Water = H₂O).
Mixture: A combination of substances physically mixed but not chemically bonded
(e.g., saltwater).
4. State Newton’s Three Laws of Motion.
Answer:
1. First Law (Inertia): A body remains at rest or in uniform motion unless acted upon
by an external force.
2. Second Law: Force = mass × acceleration (F = ma).
3. Third Law: Every action has an equal and opposite reaction.
5. What is the difference between mass and weight?
Answer:
Mass: The amount of matter in an object (constant; measured in kg).
Answer:
Plant cells have a cell wall, chloroplasts, and a large central vacuole, which help in
photosynthesis and maintaining structure.
Animal cells lack a cell wall and chloroplasts but contain centrioles and lysosomes. Both
have a nucleus, mitochondria, and cell membrane.
2. Explain photosynthesis in one paragraph.
Answer:
Photosynthesis is the process by which green plants convert sunlight, water, and carbon
dioxide into glucose and oxygen. It occurs mainly in the chloroplasts using chlorophyll.
This process provides energy for the plant and oxygen for the atmosphere.
3. What is the difference between elements, compounds, and mixtures?
Answer:
Element: A pure substance made of only one type of atom (e.g., Oxygen).
Compound: A substance formed when two or more elements chemically combine in
fixed ratios (e.g., Water = H₂O).
Mixture: A combination of substances physically mixed but not chemically bonded
(e.g., saltwater).
4. State Newton’s Three Laws of Motion.
Answer:
1. First Law (Inertia): A body remains at rest or in uniform motion unless acted upon
by an external force.
2. Second Law: Force = mass × acceleration (F = ma).
3. Third Law: Every action has an equal and opposite reaction.
5. What is the difference between mass and weight?
Answer:
Mass: The amount of matter in an object (constant; measured in kg).
