National 5 Biology PRELIM Questions
and Answers | Latest Version | 2025/2026
| Correct & Verified
What part of the cell controls all cell activities?
✔✔Nucleus
What structure in plant cells is responsible for photosynthesis?
✔✔Chloroplast
What type of cell division is used for growth and repair?
✔✔Mitosis
What gas is required for aerobic respiration?
✔✔Oxygen
What sugar is broken down in respiration to release energy?
✔✔Glucose
1
,Which organ in the human body filters blood to remove waste?
✔✔Kidney
What is the name of the pigment that gives leaves their green color?
✔✔Chlorophyll
What type of molecule are enzymes made of?
✔✔Proteins
Where does diffusion happen in the human lungs?
✔✔Alveoli
What is the name of the process where water moves across a membrane?
✔✔Osmosis
What is the main function of the red blood cells?
✔✔To carry oxygen
2
,What part of the plant transports water from the roots to the leaves?
✔✔Xylem
What is the function of guard cells in leaves?
✔✔To control the opening and closing of stomata
What type of reproduction involves only one parent?
✔✔Asexual reproduction
What process produces gametes in animals?
✔✔Meiosis
What is the name of the female gamete in humans?
✔✔Egg
What structure in the leaf allows gas exchange?
✔✔Stomata
3
, What do we call a change in DNA that may lead to a new characteristic?
✔✔Mutation
Which type of respiration does not require oxygen?
✔✔Fermentation
What waste product is produced during fermentation in animal cells?
✔✔Lactic acid
What is the term for the movement of molecules from high to low concentration?
✔✔Diffusion
What part of a bacterial cell contains its genetic information?
✔✔Circular chromosome
What is the first stage of genetic engineering?
✔✔Identifying the required gene
4
and Answers | Latest Version | 2025/2026
| Correct & Verified
What part of the cell controls all cell activities?
✔✔Nucleus
What structure in plant cells is responsible for photosynthesis?
✔✔Chloroplast
What type of cell division is used for growth and repair?
✔✔Mitosis
What gas is required for aerobic respiration?
✔✔Oxygen
What sugar is broken down in respiration to release energy?
✔✔Glucose
1
,Which organ in the human body filters blood to remove waste?
✔✔Kidney
What is the name of the pigment that gives leaves their green color?
✔✔Chlorophyll
What type of molecule are enzymes made of?
✔✔Proteins
Where does diffusion happen in the human lungs?
✔✔Alveoli
What is the name of the process where water moves across a membrane?
✔✔Osmosis
What is the main function of the red blood cells?
✔✔To carry oxygen
2
,What part of the plant transports water from the roots to the leaves?
✔✔Xylem
What is the function of guard cells in leaves?
✔✔To control the opening and closing of stomata
What type of reproduction involves only one parent?
✔✔Asexual reproduction
What process produces gametes in animals?
✔✔Meiosis
What is the name of the female gamete in humans?
✔✔Egg
What structure in the leaf allows gas exchange?
✔✔Stomata
3
, What do we call a change in DNA that may lead to a new characteristic?
✔✔Mutation
Which type of respiration does not require oxygen?
✔✔Fermentation
What waste product is produced during fermentation in animal cells?
✔✔Lactic acid
What is the term for the movement of molecules from high to low concentration?
✔✔Diffusion
What part of a bacterial cell contains its genetic information?
✔✔Circular chromosome
What is the first stage of genetic engineering?
✔✔Identifying the required gene
4
