What are cells?
The basic building blocks of all living things.
What is the difference between unicellular and multicellular organisms?
Unicellular → made of one cell (e.g., bacteria). Multicellular → made of many cells (e.g., humans).
Why do we use microscopes?
Because cells are too small to be seen with the naked eye.
What does the cell membrane do?
Controls what enters and leaves the cell.
What happens in the cytoplasm?
Chemical reactions take place.
What is the role of the nucleus?
Controls the cell and contains DNA.
What do mitochondria do?
Release energy by respiration.
What does the cell wall do in plant cells?
Provides strength and support (made of cellulose).
What is the function of chloroplasts?
Contain chlorophyll, absorb light for photosynthesis.
What is inside the large vacuole?
Cell sap (water, sugars, salts) – helps keep the cell firm.
Why don’t red blood cells have a nucleus?
To make more space for haemoglobin and oxygen.
How is a nerve cell adapted?
Long and thin to carry electrical signals quickly.
What makes root hair cells efficient at absorbing water?
They have a long extension to increase surface area.
Which plant cell is packed with chloroplasts?
Palisade cell.
What is the order of organisation from cell to organism?
Cell → Tissue → Organ → Organ system → Organism.
Give an example of a tissue, an organ, and an organ system.
Tissue: muscle tissue; Organ: heart; Organ system: circulatory system.
Where does respiration take place?
In mitochondria.
Word equation for respiration?
Glucose + Oxygen → Carbon dioxide + Water + Energy.
Where does photosynthesis take place?
In chloroplasts.
Word equation for photosynthesis?
Carbon dioxide + Water → Glucose + Oxygen (with light + chlorophyll).
What are cells?
The basic building blocks of all living things.
What is the difference between unicellular and multicellular organisms?
Unicellular → made of one cell (e.g., bacteria). Multicellular → made of many cells (e.g., humans).
Why do we use microscopes?
Because cells are too small to be seen with the naked eye.
