NATIONAL 5 BIOLOGY REVISION
EXAM 2025 QUESTIONS AND ANSWERS
Where are nuclei found? - ANS In the cells of green plants, animals and fungi.
Describe a nucleus's appearance. - ANS Large, normally spherical structure containing thread
like chromosomes.
What is the function of a nucleus? - ANS To control a cell's activities and passes information
from cell to cell and genetic information (including DNA) from generation to generation.
Where are cell membranes found? - ANS In the cells of green plants, animals and fungi.
Describe a cell membrane's appearance. - ANS A thin layer surrounding the cytoplasm.
What is the function of a cell membrane? - ANS To control the passage of substances into
and out of the cell.
Where are mitochondria found? - ANS In the cells of green plants, animals and fungi.
Describe a mitochondria's appearance. - ANS One of many, tiny, sausage like structures
containing enzymes.
What is the function of mitochondria? - ANS Aerobic respiration.
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, Where are large central vacuole found? - ANS In the cells of plants and fungi.
Describe a large central vacuole's appearance. - ANS Fluid filled sac-like structure in
cytoplasm.
What is the function of a large central vacuole? - ANS Stores water and solutes as cell sap
and regulates water content by osmosis.
Where are cell walls found? - ANS In the cells of green plants, fungi and bacteria.
Describe a cell wall's appearance. - ANS Outer layer made up of basket like structure of fibers
(structure and composition of cell wall of fungi and bacteria differ from that of green plant
cells)
What is the function of a cell wall? - ANS To support the structure of a cell
Where are Chloroplast found? - ANS In the cells of green plants only.
Describe a Chloroplast's appearance. - ANS One of many discus-shaped structures containing
chlorophyll.
What is the function of Chloroplast? - ANS Photosynthesis
Where are Circular chromosomes found? - ANS In the cells of bacteria only.
Describe the appearance of Circular chromosomes. - ANS Single ring of genetic material.
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EXAM 2025 QUESTIONS AND ANSWERS
Where are nuclei found? - ANS In the cells of green plants, animals and fungi.
Describe a nucleus's appearance. - ANS Large, normally spherical structure containing thread
like chromosomes.
What is the function of a nucleus? - ANS To control a cell's activities and passes information
from cell to cell and genetic information (including DNA) from generation to generation.
Where are cell membranes found? - ANS In the cells of green plants, animals and fungi.
Describe a cell membrane's appearance. - ANS A thin layer surrounding the cytoplasm.
What is the function of a cell membrane? - ANS To control the passage of substances into
and out of the cell.
Where are mitochondria found? - ANS In the cells of green plants, animals and fungi.
Describe a mitochondria's appearance. - ANS One of many, tiny, sausage like structures
containing enzymes.
What is the function of mitochondria? - ANS Aerobic respiration.
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, Where are large central vacuole found? - ANS In the cells of plants and fungi.
Describe a large central vacuole's appearance. - ANS Fluid filled sac-like structure in
cytoplasm.
What is the function of a large central vacuole? - ANS Stores water and solutes as cell sap
and regulates water content by osmosis.
Where are cell walls found? - ANS In the cells of green plants, fungi and bacteria.
Describe a cell wall's appearance. - ANS Outer layer made up of basket like structure of fibers
(structure and composition of cell wall of fungi and bacteria differ from that of green plant
cells)
What is the function of a cell wall? - ANS To support the structure of a cell
Where are Chloroplast found? - ANS In the cells of green plants only.
Describe a Chloroplast's appearance. - ANS One of many discus-shaped structures containing
chlorophyll.
What is the function of Chloroplast? - ANS Photosynthesis
Where are Circular chromosomes found? - ANS In the cells of bacteria only.
Describe the appearance of Circular chromosomes. - ANS Single ring of genetic material.
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