Question

1(a)(i) What is a cell?
(ii) Name three scientists that are associated with the discovery of the cell.
(b)(i) Make a diagram, 6cm to 8cm long of a plant cell and label only the organelle responsible for cell reproduction.
(ii) Name one blood cell in humans that does not have the organelle in 1b(i).
(iii) What is the biological implication of the cell named 1b(ii) not possessing the organelle responsible for cell reproduction?
(c) List six organelles found in a plant cell.

Accepted Answer

(a)(i) The cell is the basic, structural and functional unit of life.
(ii) Scientists associated with the discovery of the cell: Theodor Schwann; Matthias Schleiden; Rudolf Virchow.

(b)(i) [Diagram: plant cell labelled, showing cell wall, cell membrane, nucleus (labelled as the organelle responsible for cell reproduction), cytoplasm, chloroplast, vacuole, endoplasmic reticulum, Golgi apparatus, mitochondria.]
NB: The key organelle responsible for cell reproduction is the nucleus.
(ii) The blood cell that lacks a nucleus is the red blood cell/erythrocyte.
(iii) The absence of a nucleus allows the red blood cell to contain more haemoglobin and, therefore, carry more oxygen molecules. However, without a nucleus, they cannot divide to make new red blood cells.

(c) Organelles found in a plant cell: Nucleus; Mitochondria; Chloroplast; Vacuole; Endoplasmic reticulum; Golgi apparatus; Lysosome; Cell wall.

WAEC Biology 2022 Theory — Question 1

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