NABTEB BiologyPast Questions & Explanations

Practice 185+ NABTEB Biology questions from the SuperPrep question bank. Every question comes with a full explanation so you learn the method, not just the answer.

1. 1.

   The endoplasmic reticulum primarily functions in

   1. A.storage and transport of materials within the cell
   2. B.cell division
   3. C.photosynthesis
   4. D.production of ATP only

   Show explanation

   The endoplasmic reticulum forms a network of membranes involved in transporting materials and synthesizing proteins and lipids.
2. 2.

   Which cell organelle is directly responsible for aerobic respiration?

   1. A.Golgi apparatus
   2. B.Mitochondrion
   3. C.Nucleus
   4. D.Ribosome

   Show explanation

   Aerobic respiration occurs in the mitochondria where energy is released from food molecules.
3. 3.

   The nucleolus is mainly involved in the production of

   1. A.Cell sap
   2. B.ATP
   3. C.Ribosomes
   4. D.Chromosomes

   Show explanation

   The nucleolus synthesizes ribosomal RNA and helps in the formation of ribosomes.
4. 4.

   Which of the following cell structures is non-living?

   1. A.Cytoplasm
   2. B.Nucleus
   3. C.Cell wall
   4. D.Mitochondrion

   Show explanation

   The cell wall is a non-living structure secreted by the cell, while the other options are living components of the cell.
5. 5.

   A red blood cell is adapted to its function by lacking a nucleus mainly to

   1. A.allow more room for haemoglobin
   2. B.enable photosynthesis
   3. C.facilitate cell division
   4. D.increase water storage

   Show explanation

   Mature red blood cells lose their nucleus to create more space for haemoglobin, thereby increasing oxygen-carrying capacity.
6. 6.

   The basic unit of life is the?

   1. A.Cell
   2. B.Tissue
   3. C.Organ
   4. D.System

   Show explanation

   The cell is the smallest structural and functional unit of life.
7. 7.

   Which of the following is found in both plant and animal cells?

   1. A.Cell membrane
   2. B.Cell wall
   3. C.Chloroplast
   4. D.Large central vacuole

   Show explanation

   Both plant and animal cells have a cell membrane controlling movement of substances.
8. 8.

   The control center of the cell is the?

   1. A.Nucleus
   2. B.Cytoplasm
   3. C.Ribosome
   4. D.Cell wall

   Show explanation

   The nucleus contains genetic material and controls cell activities.
9. 9.

   The cell membrane is also known as the?

   1. A.Plasma membrane
   2. B.Cell wall
   3. C.Nuclear membrane
   4. D.Tonoplast

   Show explanation

   The cell membrane is also called the plasma membrane.
10. 10.

    Which organelle is responsible for photosynthesis?

    1. A.Chloroplast
    2. B.Mitochondria
    3. C.Ribosome
    4. D.Golgi body

    Show explanation

    Chloroplast contains chlorophyll and carries out photosynthesis.

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11. 11.

    The jelly-like substance inside the cell is called?

    1. A.Cytoplasm
    2. B.Cell wall
    3. C.Nucleolus
    4. D.Vacuole

    Show explanation

    Cytoplasm contains organelles and supports cellular activities.
12. 12.

    Ribosomes are responsible for?

    1. A.Protein synthesis
    2. B.Photosynthesis
    3. C.Respiration
    4. D.Digestion

    Show explanation

    Ribosomes are the site of protein synthesis.
13. 13.

    The structure that gives plant cells a definite shape is the?

    1. A.Cell wall
    2. B.Cell membrane
    3. C.Nucleus
    4. D.Cytoplasm

    Show explanation

    The rigid cell wall provides shape and support in plant cells.
14. 14.

    Mitochondria are known as the powerhouse of the cell because they?

    1. A.Produce energy (ATP)
    2. B.Control heredity
    3. C.Store water
    4. D.Make proteins

    Show explanation

    Mitochondria release energy through respiration in the form of ATP.
15. 15.

    The movement of substances across the cell membrane without energy is called?

    1. A.Passive transport
    2. B.Active transport
    3. C.Osmosis only
    4. D.Diffusion only

    Show explanation

    Passive transport does not require energy.
16. 16.

    Which organelle modifies and packages proteins?

    1. A.Golgi apparatus
    2. B.Ribosome
    3. C.Nucleus
    4. D.Chloroplast

    Show explanation

    The Golgi apparatus processes and packages proteins for secretion.
17. 17.

    Osmosis is the movement of water molecules from a region of?

    1. A.High water concentration to low water concentration
    2. B.Low water concentration to high water concentration
    3. C.High salt concentration to low salt concentration
    4. D.Equal concentration

    Show explanation

    Osmosis is diffusion of water through a semi-permeable membrane from high to low concentration.
18. 18.

    The site of respiration in the cell is the?

    1. A.Mitochondria
    2. B.Chloroplast
    3. C.Nucleus
    4. D.Vacuole

    Show explanation

    Mitochondria are responsible for aerobic respiration.
19. 19.

    The nucleolus is responsible for the formation of?

    1. A.Ribosomes
    2. B.Cell wall
    3. C.Mitochondria
    4. D.Chlorophyll

    Show explanation

    The nucleolus produces ribosomes.
20. 20.

    Diffusion is fastest in?

    1. A.Gases
    2. B.Liquids
    3. C.Solids
    4. D.Plasma

    Show explanation

    Particles in gases move freely, making diffusion fastest.